{"id":1909,"date":"2025-08-25T02:07:24","date_gmt":"2025-08-25T02:07:24","guid":{"rendered":"https:\/\/flj-pcb.com\/?page_id=1909"},"modified":"2025-09-25T08:26:33","modified_gmt":"2025-09-25T08:26:33","slug":"high-frequency-pcb","status":"publish","type":"page","link":"https:\/\/flj-pcb.com\/fi\/pcb-manufacturer\/high-frequency-pcb\/","title":{"rendered":"Korkean taajuuden PCB: alhainen h\u00e4vi\u00f6, korkea nopeus"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"1909\" class=\"elementor elementor-1909\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2fe9c4e e-flex e-con-boxed e-con e-parent\" data-id=\"2fe9c4e\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f058cdb elementor-widget elementor-widget-text-editor\" data-id=\"f058cdb\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 data-start=\"315\" data-end=\"345\">Mik\u00e4 on korkeataajuinen PCB<\/h2><p data-start=\"347\" data-end=\"753\">A<a href=\"https:\/\/en.wikipedia.org\/wiki\/Printed_circuit_board#High_frequency_PCBs\" target=\"_blank\" rel=\"noopener\"> korkeataajuinen PCB<\/a> on erityinen painettu piirilevy (PCB), jota k\u00e4ytet\u00e4\u00e4n korkeiden s\u00e4hk\u00f6magneettisten taajuussignaalien l\u00e4hett\u00e4miseen. N\u00e4it\u00e4 levyj\u00e4 k\u00e4ytet\u00e4\u00e4n yli 300 MHz:n radiotaajuuksille (aallonpituus &lt; 1 m) ja yli 3 GHz:n mikroaaltotaajuuksille (aallonpituus &lt; 0,1 m). Ne valmistetaan mikroaaltopohjaisille kuparipinnoitetuille laminaateille. Tuotannossa voidaan k\u00e4ytt\u00e4\u00e4 joitakin j\u00e4yk\u00e4n piirilevyn vakiovaiheita tai k\u00e4ytt\u00e4\u00e4 erityismenetelmi\u00e4 n\u00e4it\u00e4 materiaaleja varten.<\/p><p data-start=\"347\" data-end=\"753\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-2728\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/High-Frequency-PCB.webp\" alt=\"High-Frequency PCB\" width=\"600\" height=\"372\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/High-Frequency-PCB.webp 600w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/High-Frequency-PCB-300x186.webp 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p><p data-start=\"755\" data-end=\"1165\">Teknologian nopean kehityksen my\u00f6t\u00e4 yh\u00e4 useammat laitteet toimivat mikroaaltokaistalla (&gt; 1 GHz) ja jopa millimetriaaltoalueilla (&gt; 30 GHz). T\u00e4m\u00e4 tarkoittaa, ett\u00e4 taajuudet kasvavat ja materiaalitarpeet lis\u00e4\u00e4ntyv\u00e4t. Perusmateriaaleilla on oltava eritt\u00e4in hyv\u00e4t s\u00e4hk\u00f6iset ominaisuudet ja hyv\u00e4 kemiallinen stabiilisuus. Kun signaalitaajuus nousee, materiaalih\u00e4vi\u00f6iden on pysytt\u00e4v\u00e4 hyvin pienin\u00e4. 5G:n tulon my\u00f6t\u00e4 suurtaajuusmateriaalien merkitys korostui.<\/p><hr data-start=\"1167\" data-end=\"1170\" \/><h1 data-start=\"1172\" data-end=\"1207\">Korkeataajuisten PCB-piirilevyjen edut<\/h1><p data-start=\"1209\" data-end=\"1430\"><strong data-start=\"1209\" data-end=\"1231\">1. Korkea hy\u00f6tysuhde<\/strong><br data-start=\"1231\" data-end=\"1234\" \/>Materiaalit, joilla on alhainen dielektrisyysvakio, aiheuttavat alhaisen h\u00e4vi\u00f6n. Nykyaikaisella induktiol\u00e4mmityksell\u00e4 ja muilla menetelmill\u00e4 voidaan saavuttaa tavoitteet ja s\u00e4ilytt\u00e4\u00e4 korkea hy\u00f6tysuhde. N\u00e4m\u00e4 levyt auttavat my\u00f6s v\u00e4hent\u00e4m\u00e4\u00e4n j\u00e4tett\u00e4 ja sopivat vihreisiin tavoitteisiin.<\/p><p data-start=\"1432\" data-end=\"1677\"><strong data-start=\"1432\" data-end=\"1449\">2. Suuri nopeus<\/strong><br data-start=\"1449\" data-end=\"1452\" \/>Signaalin nopeus on k\u00e4\u00e4nt\u00e4en verrannollinen dielektrisyysvakion neli\u00f6juureen. Pienempi dielektrisyysvakio tarkoittaa nopeampaa siirtoa. Erikoismateriaalit pit\u00e4v\u00e4t dielektrisyysvakion alhaisena ja vakaana. T\u00e4m\u00e4 edist\u00e4\u00e4 signaalin siirtoa.<\/p><p data-start=\"1679\" data-end=\"1970\"><strong data-start=\"1679\" data-end=\"1723\">3. L\u00e4mmityksen tai k\u00e4sittelyn hyv\u00e4 valvonta<\/strong><br data-start=\"1723\" data-end=\"1726\" \/>Suurtaajuuslevyj\u00e4 k\u00e4ytet\u00e4\u00e4n monilla aloilla, joilla tarvitaan metalliosien tarkkaa kuumentamista. Voit s\u00e4\u00e4t\u00e4\u00e4, kuinka syv\u00e4lle tai mihin kohtaan l\u00e4mmitys kohdistuu. Voit keskitty\u00e4 pinta- tai syv\u00e4l\u00e4mmitykseen. Voit l\u00e4mmitt\u00e4\u00e4 keskitetysti tai hajautetusti. Levy mahdollistaa hienos\u00e4\u00e4d\u00f6n.<\/p><p data-start=\"1972\" data-end=\"2316\"><strong data-start=\"1972\" data-end=\"1996\">4. Vahva kest\u00e4vyys<\/strong><br data-start=\"1996\" data-end=\"1999\" \/>Dielektrisyysvakio ja dielektrinen materiaali riippuvat ymp\u00e4rist\u00f6st\u00e4. Kosteissa tiloissa kosteus vahingoittaa levyj\u00e4. V\u00e4h\u00e4n vett\u00e4 absorboivasta materiaalista valmistetut korkeataajuuslevyt kest\u00e4v\u00e4t t\u00e4t\u00e4. Ne kest\u00e4v\u00e4t kemiallista korroosiota, kosteutta, korkeaa l\u00e4mp\u00f6\u00e4 ja niill\u00e4 on korkea kuorintapinta. N\u00e4m\u00e4 ominaisuudet tekev\u00e4t niist\u00e4 vahvoja kovissa ymp\u00e4rist\u00f6iss\u00e4.<\/p><hr data-start=\"2318\" data-end=\"2321\" \/><h1 data-start=\"2323\" data-end=\"2375\">Yleiset suurtaajuus- ja nopeat PCB-materiaalit<\/h1><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"2377\" data-end=\"2727\"><thead data-start=\"2377\" data-end=\"2419\"><tr data-start=\"2377\" data-end=\"2419\"><th data-start=\"2377\" data-end=\"2393\" data-col-size=\"sm\">Merkki \/ valmistaja<\/th><th data-start=\"2393\" data-end=\"2419\" data-col-size=\"md\">Tyypilliset sarjat \/ tyypit<\/th><\/tr><\/thead><tbody data-start=\"2430\" data-end=\"2727\"><tr data-start=\"2430\" data-end=\"2473\"><td data-start=\"2430\" data-end=\"2439\" data-col-size=\"sm\">Rogers<\/td><td data-col-size=\"md\" data-start=\"2439\" data-end=\"2473\">RO4003, RO3003, RO4350 JA RO5880<\/td><\/tr><tr data-start=\"2474\" data-end=\"2537\"><td data-start=\"2474\" data-end=\"2509\" data-col-size=\"sm\">TUC (Taiyao \/ TaYa tai TUC-merkki)<\/td><td data-col-size=\"md\" data-start=\"2509\" data-end=\"2537\">TUC862, 872SLK, 883, 933<\/td><\/tr><tr data-start=\"2538\" data-end=\"2574\"><td data-start=\"2538\" data-end=\"2550\" data-col-size=\"sm\">Panasonic<\/td><td data-col-size=\"md\" data-start=\"2550\" data-end=\"2574\">Megtron 4, Megtron 6<\/td><\/tr><tr data-start=\"2575\" data-end=\"2608\"><td data-start=\"2575\" data-end=\"2583\" data-col-size=\"sm\">Isola<\/td><td data-col-size=\"md\" data-start=\"2583\" data-end=\"2608\">FR408HR, IS620, IS680<\/td><\/tr><tr data-start=\"2609\" data-end=\"2643\"><td data-start=\"2609\" data-end=\"2617\" data-col-size=\"sm\">Nelco<\/td><td data-start=\"2617\" data-end=\"2643\" data-col-size=\"md\">N4000-13, N4000-13EPSI<\/td><\/tr><tr data-start=\"2644\" data-end=\"2727\"><td data-start=\"2644\" data-end=\"2670\" data-col-size=\"sm\">Kotimaiset valmistajat (Kiina)<\/td><td data-col-size=\"md\" data-start=\"2670\" data-end=\"2727\">Dongguan Shengyi, Taizhou Wangling, Taixing Mikroaaltouuni<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"2729\" data-end=\"2849\">(K\u00e4yt\u00e4 n\u00e4it\u00e4 esimerkkimateriaaleja l\u00e4ht\u00f6kohtana. Jokaisessa mallissa tarvitaan taajuuden ja ulkoasun kannalta oikea materiaalivalinta).<\/p><hr data-start=\"2851\" data-end=\"2854\" \/><h1 data-start=\"2856\" data-end=\"2913\">Suurtaajuuslevyjen ja HDI-levyjen v\u00e4linen eroavaisuus<\/h1><p data-start=\"2915\" data-end=\"3218\">Korkeataajuiset piirilevyt ovat tutkia, testauslaitteita, autojen t\u00f6rm\u00e4yksenestoj\u00e4rjestelmi\u00e4, viestint\u00e4satelliitteja, langattomia j\u00e4rjestelmi\u00e4 ja muita aloja varten. HDI-piirilevyt (High Density Interconnect) on tarkoitettu pienille laitteille, joissa on monia komponentteja. HDI:ss\u00e4 k\u00e4ytet\u00e4\u00e4n usein kaksipuolisia levyj\u00e4 tuotteissa, joiden tilavuus on pieni.<\/p><p data-start=\"3220\" data-end=\"3555\">Suurtaajuuslevy vaatii eritt\u00e4in korkeaa prosessinohjausta ja tarkkuutta. Usein suunnittelijat aloittavat FR-4-lasiepoksilla, mutta todellisissa suurtaajuuslevyiss\u00e4 k\u00e4ytet\u00e4\u00e4n erikoislaminaatteja. Levyll\u00e4 on oltava pieni ja vakaa dielektrisyysvakio, alhainen dielektrinen h\u00e4vi\u00f6, alhainen veden imeytyminen, korkea l\u00e4mp\u00f6tilan sietokyky ja hyv\u00e4 korroosionkest\u00e4vyys.<\/p><p data-start=\"3557\" data-end=\"3824\">HDI-levy k\u00e4ytt\u00e4\u00e4 mikrosokea l\u00e4pivientej\u00e4 suuren reititystiheyden saavuttamiseksi. Siin\u00e4 on sis\u00e4inen ja ulkoinen reititys, jotka yhdistet\u00e4\u00e4n poraamalla ja pinnoittamalla. HDI on tarkoitettu kompakteihin tuotteisiin. Joissakin HDI-malleissa k\u00e4ytet\u00e4\u00e4n modulaarisia rinnakkaismoduuleja ja vahvaa DSP-ohjausta teho- ja kuormitusominaisuuksiin.<\/p><hr data-start=\"3826\" data-end=\"3829\" \/><h1 data-start=\"3831\" data-end=\"3880\">Suurtaajuuslevyjen tyypit \/ luokittelu<\/h1><p data-start=\"3882\" data-end=\"3938\">Alla on lueteltu yleisi\u00e4 tyyppej\u00e4 ja niiden k\u00e4sittely\u00e4 koskevia huomautuksia:<\/p><p data-start=\"3940\" data-end=\"3989\"><strong data-start=\"3940\" data-end=\"3987\">1. Jauhet\u00e4ytteinen kestomuovi (keraamisesti t\u00e4ytetty)<\/strong><\/p><ul data-start=\"3990\" data-end=\"4260\"><li data-start=\"3990\" data-end=\"4078\"><p data-start=\"3992\" data-end=\"4078\">Materiaalit ja toimittajat: Arlon 25N \/ 25FR; Taconic TLG-sarja.<img decoding=\"async\" class=\"size-full wp-image-2730 aligncenter\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-4350b.webp\" alt=\"Rogers 4350b\" width=\"600\" height=\"308\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-4350b.webp 600w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-4350b-300x154.webp 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p><\/li><li data-start=\"4079\" data-end=\"4260\"><p data-start=\"4081\" data-end=\"4260\">K\u00e4sittely: vaiheet ovat samanlaiset kuin FR-4-epoksilasilaminaateissa. Levyt ovat kuitenkin hauraita ja helposti rikkoutuvia. Porien ja jyrsinterien ty\u00f6kalujen k\u00e4ytt\u00f6ik\u00e4 laskee noin 20%. K\u00e4sittele varoen.<\/p><\/li><\/ul><p data-start=\"4262\" data-end=\"4309\"><strong data-start=\"4262\" data-end=\"4307\">2. PTFE (polytetrafluorieteeni, teflon).<\/strong><\/p><ul data-start=\"4310\" data-end=\"5232\"><li data-start=\"4310\" data-end=\"4539\"><p data-start=\"4312\" data-end=\"4338\">Materiaalit ja toimittajat:<\/p><ul data-start=\"4341\" data-end=\"4539\"><li data-start=\"4341\" data-end=\"4389\"><p data-start=\"4343\" data-end=\"4389\">Rogers: sarjat: RO3000-sarja, RT-sarja, TMM-sarja.<img decoding=\"async\" class=\"alignnone size-full wp-image-2731\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-RO3003.webp\" alt=\"Rogers RO3003\" width=\"600\" height=\"450\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-RO3003.webp 600w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-RO3003-300x225.webp 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p><\/li><li data-start=\"4392\" data-end=\"4439\"><p data-start=\"4394\" data-end=\"4439\">Arlon: AD\/AR-sarja, IsoClad, CuClad-sarja: AD\/AR-sarja, IsoClad, CuClad-sarja<\/p><\/li><li data-start=\"4442\" data-end=\"4488\"><p data-start=\"4444\" data-end=\"4488\">Taconic: RF-sarja, TLX-sarja, TLY-sarja: RF-sarja, TLX-sarja, TLY-sarja<\/p><\/li><li data-start=\"4491\" data-end=\"4539\"><p data-start=\"4493\" data-end=\"4539\">Taixingin mikroaaltouuni: F4B \/ F4BM \/ F4BK \/ TP-2B<\/p><\/li><\/ul><\/li><li data-start=\"4540\" data-end=\"5232\"><p data-start=\"4542\" data-end=\"4570\">PTFE:n k\u00e4sittely\u00e4 koskevat huomautukset:<\/p><ul data-start=\"4573\" data-end=\"5232\"><li data-start=\"4573\" data-end=\"4657\"><p data-start=\"4575\" data-end=\"4657\">Pid\u00e4 suojakalvoa, kun leikkaat raakalevyj\u00e4 naarmujen ja painoj\u00e4lkien v\u00e4ltt\u00e4miseksi.<\/p><\/li><li data-start=\"4660\" data-end=\"4791\"><p data-start=\"4662\" data-end=\"4791\">K\u00e4yt\u00e4 uusia poria (suositellaan vakioporia #130). Parhaan tuloksen saat poraamalla yhden levyn kerrallaan. Pid\u00e4 puristuspaine ~40 psi:ss\u00e4.<\/p><\/li><li data-start=\"4794\" data-end=\"4872\"><p data-start=\"4796\" data-end=\"4872\">K\u00e4yt\u00e4 alumiinista taustalevy\u00e4 ja 1 mm:n melamiinityynyj\u00e4 pit\u00e4m\u00e4\u00e4n PTFE:t\u00e4 kiinni porauksen aikana.<\/p><\/li><li data-start=\"4875\" data-end=\"4931\"><p data-start=\"4877\" data-end=\"4931\">Puhalla p\u00f6ly pois rei'ist\u00e4 kuumalla ilmalla porauksen j\u00e4lkeen.<\/p><\/li><li data-start=\"4934\" data-end=\"5044\"><p data-start=\"4936\" data-end=\"5044\">K\u00e4yt\u00e4 vakaata porakonetta. Pieni\u00e4 reiki\u00e4 varten lis\u00e4\u00e4 nopeutta ja v\u00e4henn\u00e4 lastuamiskuormitusta ja karan palautusnopeutta.<\/p><\/li><li data-start=\"5047\" data-end=\"5155\"><p data-start=\"5049\" data-end=\"5155\">Rei\u00e4n pintak\u00e4sittely: matalan l\u00e4mp\u00f6tilan plasma- tai natriumnaftaleeniaktivointi auttaa rei\u00e4n metallointia.<\/p><\/li><li data-start=\"5158\" data-end=\"5232\"><p data-start=\"5160\" data-end=\"5232\">PTH (plated through hole) kuparin laskeutumiseen ja tarttumiseen on kiinnitett\u00e4v\u00e4 huomiota.<\/p><\/li><\/ul><\/li><\/ul><p data-start=\"5234\" data-end=\"5264\"><strong data-start=\"5234\" data-end=\"5262\">3. PTH-kuparin laskeutuminen<\/strong><\/p><ul data-start=\"5265\" data-end=\"5384\"><li data-start=\"5265\" data-end=\"5384\"><p data-start=\"5267\" data-end=\"5384\">Suorita PTH mikroetsauksen j\u00e4lkeen (~20 mikrotuuman kontrolli). Suorita tarvittaessa toinen PTH-kierros levyn reitityksen edellytt\u00e4m\u00e4ll\u00e4 tavalla.<\/p><\/li><\/ul><p data-start=\"5386\" data-end=\"5427\"><strong data-start=\"5386\" data-end=\"5425\">4. Juotosmaski (vihre\u00e4 maski) prosessi<\/strong><\/p><ul data-start=\"5428\" data-end=\"5701\"><li data-start=\"5428\" data-end=\"5498\"><p data-start=\"5430\" data-end=\"5498\">Esik\u00e4sittely: k\u00e4yt\u00e4 happo-\/em\u00e4spuhdistusta; v\u00e4lt\u00e4 mekaanista hiontaa.<\/p><\/li><li data-start=\"5499\" data-end=\"5574\"><p data-start=\"5501\" data-end=\"5574\">Esik\u00e4sittelyn j\u00e4lkeen levy\u00e4 paistetaan (90 \u00b0C 30 minuutin ajan) ja levitet\u00e4\u00e4n kuiva kalvo.<\/p><\/li><li data-start=\"5575\" data-end=\"5701\"><p data-start=\"5577\" data-end=\"5701\">Paista kolmessa vaiheessa: 80\u00b0C, 100\u00b0C, 150\u00b0C, 30 min kukin. Jos maskissa n\u00e4kyy \u00f6ljyl\u00e4ikki\u00e4, poista maski ja toista aktivointik\u00e4sittely.<\/p><\/li><\/ul><p data-start=\"5703\" data-end=\"5741\"><strong data-start=\"5703\" data-end=\"5739\">5. PTFE-levyjen reititys \/ jyrsint\u00e4<\/strong><\/p><ul data-start=\"5742\" data-end=\"6038\"><li data-start=\"5742\" data-end=\"5835\"><p data-start=\"5744\" data-end=\"5835\">K\u00e4yt\u00e4 ohutta paperia PTFE-j\u00e4ljityspuolella ja kiinnit\u00e4 FR-4- tai fenolinen taustalevy reitityksen aikana.<\/p><\/li><li data-start=\"5836\" data-end=\"6038\"><p data-start=\"5838\" data-end=\"6038\">Jyrsinn\u00e4n j\u00e4lkeen viimeistele k\u00e4sin reunapurseet ja tarkista huolellisesti. V\u00e4lt\u00e4 kuparin ja levyn pinnan vahingoittamista. K\u00e4yt\u00e4 rikit\u00f6nt\u00e4 erotuspaperia. V\u00e4henn\u00e4 purseita hyvin. Jyrsint\u00e4vaiheessa on j\u00e4tett\u00e4v\u00e4 hyv\u00e4 reunojen viimeistely.<\/p><\/li><\/ul><hr data-start=\"6040\" data-end=\"6043\" \/><h1 data-start=\"6045\" data-end=\"6093\">Korkean taajuuden PTFE-levyjen tuotantovirtaus<\/h1><p data-start=\"6095\" data-end=\"6167\">Alla on kolme yleist\u00e4 prosessivirtaa. Laitoin ne taulukkoon selkeyden vuoksi.<\/p><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"6169\" data-end=\"6917\"><thead data-start=\"6169\" data-end=\"6207\"><tr data-start=\"6169\" data-end=\"6207\"><th data-start=\"6169\" data-end=\"6184\" data-col-size=\"sm\">Prosessin tyyppi<\/th><th data-start=\"6184\" data-end=\"6207\" data-col-size=\"xl\">T\u00e4rkeimm\u00e4t vaiheet (yhteenveto)<\/th><\/tr><\/thead><tbody data-start=\"6218\" data-end=\"6917\"><tr data-start=\"6218\" data-end=\"6482\"><td data-start=\"6218\" data-end=\"6260\" data-col-size=\"sm\">NPTH (pinnoittamaton l\u00e4pireik\u00e4) PTFE:t\u00e4 varten<\/td><td data-col-size=\"xl\" data-start=\"6260\" data-end=\"6482\">Leikkaus \u2192 Poraus \u2192 Kuivakalvo \u2192 Tarkastus \u2192 Sy\u00f6vytys \u2192 Sy\u00f6vytystarkastus \u2192 Juotosmaski \u2192 Kuivakalvon altistaminen \u2192 Kuumailmajuotoksen tasoitus (HASL) tai tinasuihkutus \u2192 Jyrsint\u00e4\/muokkaus \u2192 Tarkastus \u2192 Lopputarkastus \u2192 Pakkaus \u2192 Toimitus \u2192 Toimitus<\/td><\/tr><tr data-start=\"6483\" data-end=\"6822\"><td data-start=\"6483\" data-end=\"6520\" data-col-size=\"sm\">PTH (Plated Through Hole) PTFE:lle (p\u00e4\u00e4llystetty l\u00e4pireik\u00e4)<\/td><td data-col-size=\"xl\" data-start=\"6520\" data-end=\"6822\">Leikkaus \u2192 Poraus \u2192 Reik\u00e4k\u00e4sittely (matalal\u00e4mp\u00f6plasma tai natriumnaftaleeniaktivointi) \u2192 Kuparointi \u2192 Paneelin s\u00e4hk\u00f6testi \u2192 Kuivakalvo \u2192 Tarkastus \u2192 Kuvantaminen \u2192 Sy\u00f6vytys \u2192 Sy\u00f6vytystarkastus \u2192 Juotosmaski \u2192 Kuivakalvojen valotus \u2192 HASL \u2192 Jyrsint\u00e4\/muokkaus \u2192 Tarkastus \u2192 Lopputarkastus \u2192 Pakkaus \u2192 Toimitus<\/td><\/tr><tr data-start=\"6823\" data-end=\"6917\"><td data-start=\"6823\" data-end=\"6854\" data-col-size=\"sm\">Juotosmaskiprosessin valvonta<\/td><td data-col-size=\"xl\" data-start=\"6854\" data-end=\"6917\">Tarkkaile huolellisesti vihre\u00e4n maskin tarttuvuutta ja kuplanmuodostusta.<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"6919\" data-end=\"6999\">Huomautus: Jokaisessa prosessivaiheessa on valvottava tiukasti pintanaarmuja ja muita vikoja.<\/p><hr data-start=\"7001\" data-end=\"7004\" \/><h1 data-start=\"7006\" data-end=\"7043\">Korkeataajuisten piirilevyjen sovellukset<\/h1><p data-start=\"7045\" data-end=\"7084\">Korkeataajuisia PCB:t\u00e4 esiintyy yleisesti:<\/p><ul data-start=\"7086\" data-end=\"7468\"><li data-start=\"7086\" data-end=\"7137\"><p data-start=\"7088\" data-end=\"7137\">Tehovahvistimet ja kohinavahvistimet (LNA)<\/p><\/li><li data-start=\"7138\" data-end=\"7198\"><p data-start=\"7140\" data-end=\"7198\">Mobiiliviestint\u00e4tuotteet ja \u00e4lykk\u00e4\u00e4t valaistusj\u00e4rjestelm\u00e4t<\/p><\/li><li data-start=\"7199\" data-end=\"7273\"><p data-start=\"7201\" data-end=\"7273\">Tehonjakajat, kytkimet, duplekserit, suodattimet ja muut passiiviset laitteet<\/p><\/li><li data-start=\"7274\" data-end=\"7366\"><p data-start=\"7276\" data-end=\"7366\">Autojen t\u00f6rm\u00e4yksenestoj\u00e4rjestelm\u00e4t, viestint\u00e4satelliitit, langattomat puhelinj\u00e4rjestelm\u00e4t.<\/p><\/li><li data-start=\"7367\" data-end=\"7468\"><p data-start=\"7369\" data-end=\"7468\">Lyhyesti sanottuna elektroniikka siirtyy korkeampiin taajuuksiin, ja suurtaajuuslevyt seuraavat t\u00e4t\u00e4 suuntausta.<\/p><\/li><\/ul><hr data-start=\"7470\" data-end=\"7473\" \/><h1 data-start=\"7475\" data-end=\"7510\">Kuinka suunnitella korkean taajuuden piirilevyj\u00e4?<\/h1><p data-start=\"7512\" data-end=\"7840\">Korkeataajuisen piirilevyn suunnittelussa tehotasojen asettelu on kriittinen. Laita teho yleens\u00e4 omalle kerrokselleen. T\u00e4m\u00e4 auttaa piiri\u00e4 seuraamaan pienimm\u00e4n impedanssin polkua. Tehotason on tarjottava paluureitit kaikille piirilevyn signaaleille. T\u00e4m\u00e4 pienent\u00e4\u00e4 silmukkapinta-alaa ja v\u00e4hent\u00e4\u00e4 kohinaa. Matalataajuussuunnittelijat j\u00e4tt\u00e4v\u00e4t usein huomiotta joitakin n\u00e4ist\u00e4 kohinaongelmista.<\/p><p data-start=\"7842\" data-end=\"7890\">Noudata n\u00e4it\u00e4 s\u00e4\u00e4nt\u00f6j\u00e4 korkeataajuisen piirilevyn suunnittelussa:<\/p><ul data-start=\"7892\" data-end=\"8086\"><li data-start=\"7892\" data-end=\"7937\"><p data-start=\"7894\" data-end=\"7937\">Pid\u00e4 voima ja maa vakaina ja yhten\u00e4isin\u00e4.<\/p><\/li><li data-start=\"7938\" data-end=\"8001\"><p data-start=\"7940\" data-end=\"8001\">Huolellinen reititys ja oikea p\u00e4\u00e4tt\u00e4minen poistavat heijastukset.<\/p><\/li><li data-start=\"8002\" data-end=\"8086\"><p data-start=\"8004\" data-end=\"8086\">Huolellinen reititys ja oikea terminointi v\u00e4hent\u00e4v\u00e4t kapasitanssia ja mitattua ristikk\u00e4is\u00e4\u00e4nt\u00e4.<\/p><\/li><\/ul><p data-start=\"8088\" data-end=\"8124\">Seuraavassa k\u00e4sittelen useita keskeisi\u00e4 aiheita.<\/p><h2 data-start=\"8126\" data-end=\"8156\">(1) Siirtolinjan leveys<\/h2><p data-start=\"8158\" data-end=\"8249\">Siirtojohdon leveyden suurtaajuuspiirilevysuunnittelussa on noudatettava impedanssin sovitusteoriaa.<\/p><p data-start=\"8251\" data-end=\"8701\"><strong data-start=\"8251\" data-end=\"8273\">Impedanssin sovittaminen<\/strong><br data-start=\"8273\" data-end=\"8276\" \/>Kun tulo-\/l\u00e4ht\u00f6impedanssi ja siirtojohdon impedanssi vastaavat toisiaan, j\u00e4rjestelm\u00e4 tuottaa suurimman mahdollisen l\u00e4ht\u00f6tehon ja pienimm\u00e4n heijastuksen. Mikroaaltopiireiss\u00e4 sovittamisessa on otettava huomioon my\u00f6s laitteen bias-pisteet. Signaalijohtojen l\u00e4piviennit muuttavat siirto-ominaisuuksia. TTL- ja CMOS-j\u00e4rjestelmiss\u00e4 ominaisimpedanssi on korkea, joten vaikutus on pieni. Mutta 50 \u03a9:n matalaimpedanssisten RF-linjojen kohdalla l\u00e4piviennit on otettava huomioon. V\u00e4lt\u00e4 yleens\u00e4 l\u00e4pivientej\u00e4 t\u00e4llaisilla linjoilla.<\/p><h2 data-start=\"8703\" data-end=\"8755\">(2) Rinnakkaisten siirtojohtojen v\u00e4linen ristikk\u00e4ish\u00e4iri\u00f6<\/h2><p data-start=\"8757\" data-end=\"9122\">Kun kaksi mikroliuskajohtoa kulkee l\u00e4hekk\u00e4in ja rinnakkain, syntyy kytkent\u00e4. Ne aiheuttavat ristikk\u00e4ispuhelua ja muuttavat linjan ominaisimpedanssia. Kiinnit\u00e4 huomiota 50 \u03a9:n ja 75 \u03a9:n piireihin. Suunnittelijat voivat k\u00e4ytt\u00e4\u00e4 kytkent\u00e4\u00e4 joihinkin toimintoihin, kuten suuntauskytkimiin tai tehonmittaukseen. Esimerkkiarvot yhdest\u00e4 suunnittelusta (1,97 GHz:n PCS-p\u00e4\u00e4tytukiasemavahvistin, dielektrinen \u03b5r = 3,48):<\/p><ul data-start=\"9124\" data-end=\"9266\"><li data-start=\"9124\" data-end=\"9195\"><p data-start=\"9126\" data-end=\"9195\">10 dB:n suuntaajakytkimelle: S = 5 mil, l = 920 mil, W = 53 mil.<\/p><\/li><li data-start=\"9196\" data-end=\"9266\"><p data-start=\"9198\" data-end=\"9266\">20 dB:n suuntaajakytkimelle: S = 35 mil, l = 920 mil, W = 62 mil.<\/p><\/li><\/ul><p data-start=\"9268\" data-end=\"9308\">V\u00e4hent\u00e4\u00e4ksesi ristikk\u00e4is\u00e4\u00e4ni\u00e4 noudata seuraavia s\u00e4\u00e4nt\u00f6j\u00e4:<\/p><p data-start=\"9310\" data-end=\"9556\">A. Suurtaajuisten tai suurnopeuksisten rinnakkaisten linjojen v\u00e4li S on pidett\u00e4v\u00e4 v\u00e4hint\u00e4\u00e4n yhden viivan levyisen\u00e4.<br data-start=\"9404\" data-end=\"9407\" \/>B. Leikataan mahdollisuuksien mukaan yhdensuuntaista pituutta.<br data-start=\"9450\" data-end=\"9453\" \/>C. Pid\u00e4 pienet suurtaajuussignaalit kaukana virta- ja logiikkajohdoista, jotka voivat aiheuttaa voimakkaita h\u00e4iri\u00f6it\u00e4.<\/p><h2 data-start=\"9558\" data-end=\"9600\">(3) Maadoitus s\u00e4hk\u00f6magneettisen analyysin kautta<\/h2><p data-start=\"9602\" data-end=\"10021\">Laita IC-maadoitusnastoja tai muita maadoitusnastoja varten maadoitusl\u00e4piviennit l\u00e4helle nastoja korkeataajuuspiireiss\u00e4. Idea: lyhyt maadoitusreitti toimii induktiivisen impedanssin tavoin. Maadoitusv\u00e4yl\u00e4 n\u00e4ytt\u00e4\u00e4 my\u00f6s induktiiviselta. T\u00e4m\u00e4 vaikuttaa suodattimen toimintaan. T\u00e4m\u00e4n vuoksi maadoitusl\u00e4piviennit on sijoitettava l\u00e4helle nastoja. Induktiivisen kuorman v\u00e4hent\u00e4miseksi k\u00e4yt\u00e4 enemm\u00e4n maadoitusl\u00e4pivientej\u00e4 kuin matalataajuuspiireiss\u00e4. T\u00e4m\u00e4 lis\u00e4\u00e4 maavirtakapasiteettia ja auttaa pit\u00e4m\u00e4\u00e4n kaikki pisteet l\u00e4hell\u00e4 0 V:t\u00e4.<\/p><h2 data-start=\"10023\" data-end=\"10045\">(4) Virran suodatus<\/h2><p data-start=\"10047\" data-end=\"10529\">TTL- ja CMOS-suunnittelijat lis\u00e4\u00e4v\u00e4t ohituskondensaattoreita virtanastojen l\u00e4heisyyteen logiikkakohinan v\u00e4hent\u00e4miseksi. Korkeataajuus- ja mikroaaltopiireiss\u00e4 t\u00e4m\u00e4 ei riit\u00e4. Korkeataajuiset signaalit aiheuttavat suurtaajuush\u00e4iri\u00f6it\u00e4 virtaan. K\u00e4yt\u00e4 sarjainduktoreja ja kondensaattoreita. Valitse induktorit ty\u00f6skentelytaajuuden mukaan. Esimerkki: Jos haluat suodattaa &gt;1 MHz:n kohinaa C = 0,1 \u03bcF:ll\u00e4, valitse L = 1 \u03bcH. Ole varovainen, kun lis\u00e4\u00e4t induktanssia kollektorin avoimen piirin signaalinastoihin. Induktori toimii silloin sovitusinduktanssin tavoin.<\/p><h2 data-start=\"10531\" data-end=\"10547\">(5) Suojaus<\/h2><p data-start=\"10549\" data-end=\"10680\">K\u00e4yt\u00e4 suojausta pienten tai korkeataajuisten signaalien suojaamiseen. T\u00e4m\u00e4 v\u00e4hent\u00e4\u00e4 voimakkaita signaalih\u00e4iri\u00f6it\u00e4 ja v\u00e4hent\u00e4\u00e4 s\u00e4hk\u00f6magneettista h\u00e4iri\u00f6t\u00e4. Joitakin ohjeita:<\/p><p data-start=\"10682\" data-end=\"10902\">A. Matalataajuisissa digitaalisissa\/analogisissa (&lt;30 MHz) piensignaalisuunnitelmissa digitaaliset ja analogiset maadoitukset on jaettava ja maadoitustaso on kaadettava piensignaalialueille. Pid\u00e4 maadoituksen ja johtojen v\u00e4linen et\u00e4isyys suurempana kuin johtojen leveys.<\/p><p data-start=\"10904\" data-end=\"11021\">B. Korkeataajuisten digitaalisten\/analogisten piensignaalien suunnittelussa on lis\u00e4tt\u00e4v\u00e4 suojapurkkeja tai ommeltuja maadoitusl\u00e4pivientej\u00e4 alueiden erist\u00e4miseksi.<\/p><p data-start=\"10904\" data-end=\"11021\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2729\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Isola-PCB.webp\" alt=\"Isola-PCB\" width=\"600\" height=\"449\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Isola-PCB.webp 600w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Isola-PCB-300x225.webp 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p><p data-start=\"11023\" data-end=\"11245\">C. Suuritehoisissa suurtaajuuspiireiss\u00e4 suurtaajuusosasta on teht\u00e4v\u00e4 erillinen toiminnallinen moduuli ja lis\u00e4tt\u00e4v\u00e4 metallinen suojakotelo s\u00e4teilyn v\u00e4hent\u00e4miseksi. Esimerkiksi 155 M:n, 622 M:n tai 2 Gb\/s:n optiset kuitul\u00e4hetinmoduulit.<\/p><p data-start=\"11247\" data-end=\"11435\">Matkapuhelimen monikerroksinen piirilevy (esimerkki: Nokia 6110) voi sijoittaa komponentit molemmille puolille ja k\u00e4ytt\u00e4\u00e4 sis\u00e4isi\u00e4 maadoituksia alkuper\u00e4isen kuvan mukaisesti. (Kuvaviittaukset on j\u00e4tetty t\u00e4ss\u00e4 pois.)<\/p><hr data-start=\"11437\" data-end=\"11440\" \/><h1 data-start=\"11442\" data-end=\"11490\">Esimerkkej\u00e4 korkeiden lautojen materiaalivalinnoista<\/h1><p data-start=\"11492\" data-end=\"11548\">Alla on esimerkkej\u00e4 suunnittelemistamme ja virheenkorjaamistamme piirilevyist\u00e4:<\/p><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"11550\" data-end=\"12491\"><thead data-start=\"11550\" data-end=\"11608\"><tr data-start=\"11550\" data-end=\"11608\"><th data-start=\"11550\" data-end=\"11580\" data-col-size=\"sm\">Sovellus (taajuus \/ laite)<\/th><th data-start=\"11580\" data-end=\"11599\" data-col-size=\"md\">Materiaali \/ pino<\/th><th data-start=\"11599\" data-end=\"11608\" data-col-size=\"md\">Huomautukset<\/th><\/tr><\/thead><tbody data-start=\"11624\" data-end=\"12491\"><tr data-start=\"11624\" data-end=\"11797\"><td data-start=\"11624\" data-end=\"11656\" data-col-size=\"sm\">2,4 GHz:n hajautetun spektrin rele<\/td><td data-col-size=\"md\" data-start=\"11656\" data-end=\"11700\">FR-4, 4-kerroksinen piirilevy, jossa on suuret maadoitukset<\/td><td data-col-size=\"md\" data-start=\"11700\" data-end=\"11797\">Korkeataajuinen analoginen osa erotettu. Voimajohdoissa k\u00e4ytet\u00e4\u00e4n induktoreja digitaalisen osan erist\u00e4miseen.<\/td><\/tr><tr data-start=\"11798\" data-end=\"11939\"><td data-start=\"11798\" data-end=\"11823\" data-col-size=\"sm\">2,4 GHz RF-l\u00e4hetin-vastaanotin<\/td><td data-col-size=\"md\" data-start=\"11823\" data-end=\"11859\">PTFE-materiaali, kaksipuolinen levy<\/td><td data-col-size=\"md\" data-start=\"11859\" data-end=\"11939\">RF-l\u00e4hetys ja -vastaanotto erillisiss\u00e4 metallisuojakoteloissa; tehonsy\u00f6tt\u00f6 suodatettu.<\/td><\/tr><tr data-start=\"11940\" data-end=\"12035\"><td data-start=\"11940\" data-end=\"11965\" data-col-size=\"sm\">1,9 GHz RF-l\u00e4hetin-vastaanotin<\/td><td data-col-size=\"md\" data-start=\"11965\" data-end=\"11994\">PTFE-materiaali, 4-kerroksinen PCB<\/td><td data-col-size=\"md\" data-start=\"11994\" data-end=\"12035\">K\u00e4yt\u00e4 suuria maakaivoja ja suojauksia.<\/td><\/tr><tr data-start=\"12036\" data-end=\"12123\"><td data-start=\"12036\" data-end=\"12061\" data-col-size=\"sm\">140 MHz:n IF-l\u00e4hetin-vastaanotin<\/td><td data-col-size=\"md\" data-start=\"12061\" data-end=\"12086\">Pintakerros S1139 0,3 mm<\/td><td data-col-size=\"md\" data-start=\"12086\" data-end=\"12123\">Suuri maa kaadetaan; eristyksen kautta.<\/td><\/tr><tr data-start=\"12124\" data-end=\"12223\"><td data-start=\"12124\" data-end=\"12148\" data-col-size=\"sm\">70 MHz:n IF-l\u00e4hetin-vastaanotin<\/td><td data-col-size=\"md\" data-start=\"12148\" data-end=\"12168\">FR-4, 4-kerroksinen PCB<\/td><td data-col-size=\"md\" data-start=\"12168\" data-end=\"12223\">Suuri maa-alue; moduulien erist\u00e4minen aitojen kautta.<\/td><\/tr><tr data-start=\"12224\" data-end=\"12385\"><td data-start=\"12224\" data-end=\"12247\" data-col-size=\"sm\">30 W tehovahvistin<\/td><td data-col-size=\"md\" data-start=\"12247\" data-end=\"12283\">RO4350 materiaali, kaksipuolinen PCB<\/td><td data-col-size=\"md\" data-start=\"12283\" data-end=\"12385\">Suuri maadoitusvalu; et\u00e4isyys s\u00e4\u00e4detty &gt;= 50 \u03a9:n viivanleveyteen; suojakotelo ja virransy\u00f6t\u00f6n suodatus.<\/td><\/tr><tr data-start=\"12386\" data-end=\"12491\"><td data-start=\"12386\" data-end=\"12414\" data-col-size=\"sm\">2000 MHz:n mikroaaltol\u00e4hde<\/td><td data-col-size=\"md\" data-start=\"12414\" data-end=\"12433\">S1139 0,8 mm yl\u00e4osa<\/td><td data-col-size=\"md\" data-start=\"12433\" data-end=\"12491\">Kaksipuolinen piirilevy; j\u00e4ljen mittojen tarkka hallinta.<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"12493\" data-end=\"12573\">K\u00e4yt\u00e4 n\u00e4it\u00e4 esimerkkein\u00e4. Jokaisessa projektissa on valittava oma materiaalinsa ja paksuutensa.<\/p><hr data-start=\"12575\" data-end=\"12578\" \/><h1 data-start=\"12580\" data-end=\"12622\">Korkean taajuuden PCB-materiaalivaatimukset<\/h1><p data-start=\"12624\" data-end=\"12677\">Suunnittelijoiden tulisi tarkistaa n\u00e4m\u00e4 keskeiset materiaaliominaisuudet:<\/p><ol data-start=\"12679\" data-end=\"13167\"><li data-start=\"12679\" data-end=\"12784\"><p data-start=\"12682\" data-end=\"12784\"><strong data-start=\"12682\" data-end=\"12720\">Dielektrinen h\u00e4vi\u00f6 (Df, h\u00e4vi\u00f6tangentti)<\/strong> on oltava hyvin pieni. Pieni h\u00e4vi\u00f6 tarkoittaa pienemp\u00e4\u00e4 signaalin vaimennusta.<\/p><\/li><li data-start=\"12785\" data-end=\"12884\"><p data-start=\"12788\" data-end=\"12884\"><strong data-start=\"12788\" data-end=\"12812\">Alhainen veden imeytyminen<\/strong> on t\u00e4rke\u00e4\u00e4. Suuri vedenotto muuttaa dielektrisyysvakiota ja h\u00e4vi\u00f6t\u00e4.<\/p><\/li><li data-start=\"12885\" data-end=\"13021\"><p data-start=\"12888\" data-end=\"13021\"><strong data-start=\"12888\" data-end=\"12916\">Dielektrisyysvakio (DK)<\/strong> on oltava alhainen ja vakaa. Pienempi DK antaa suuremman signaalinopeuden. DK:n vakaus auttaa my\u00f6s impedanssin ohjauksessa.<\/p><\/li><li data-start=\"13022\" data-end=\"13167\"><p data-start=\"13025\" data-end=\"13167\"><strong data-start=\"13025\" data-end=\"13050\">CTE ja terminen yhteensopivuus<\/strong> kuparifolion ja alustan v\u00e4lill\u00e4 on oltava samanlainen. Suuri ep\u00e4suhta l\u00e4mp\u00f6tilan muutosten aikana voi aiheuttaa kuparin irtoamista.<\/p><\/li><\/ol><p data-start=\"13169\" data-end=\"13256\">Suurtaajuus tarkoittaa usein fluoripolymeerialustojen, kuten PTFE:n (tunnetaan nimell\u00e4 teflon), k\u00e4ytt\u00f6\u00e4.<\/p><hr data-start=\"13258\" data-end=\"13261\" \/><h1 data-start=\"13263\" data-end=\"13321\">Korkean taajuuden piirilevyjen valmistusta koskevat huomautukset ja varoitukset<\/h1><ol data-start=\"13323\" data-end=\"13843\"><li data-start=\"13323\" data-end=\"13424\"><p data-start=\"13326\" data-end=\"13424\"><strong data-start=\"13326\" data-end=\"13358\">Impedanssin s\u00e4\u00e4t\u00f6 on tiukka.<\/strong> Viivan leveyden toleranssi on tiukka. Tyypillinen ohjaustoleranssi ~ \u00b12%.<\/p><\/li><li data-start=\"13425\" data-end=\"13580\"><p data-start=\"13428\" data-end=\"13580\"><strong data-start=\"13428\" data-end=\"13473\">PTH:n tarttuvuus on alhainen erikoismateriaaleissa.<\/strong> K\u00e4yt\u00e4 plasman pintakarhennusta reikiin ja pintoihin, jotta voidaan parantaa pinnoituksen ja juotosvastuksen tarttuvuutta.<\/p><\/li><li data-start=\"13581\" data-end=\"13711\"><p data-start=\"13584\" data-end=\"13711\"><strong data-start=\"13584\" data-end=\"13627\">\u00c4l\u00e4 hio levy\u00e4 ennen juottamista.<\/strong> T\u00e4m\u00e4 v\u00e4hent\u00e4\u00e4 tarttuvuutta. K\u00e4yt\u00e4 vain mikroetsausliuoksia tai muita karhennusmenetelmi\u00e4.<\/p><\/li><li data-start=\"13712\" data-end=\"13843\"><p data-start=\"13715\" data-end=\"13843\"><strong data-start=\"13715\" data-end=\"13783\">PTFE-levyt aiheuttavat usein karheita reunoja tavallisilla jyrsint\u00e4ty\u00f6kaluilla.<\/strong> K\u00e4yt\u00e4 erikoisjyrsimi\u00e4 ja noudata PTFE-jyrsint\u00e4k\u00e4yt\u00e4nt\u00f6j\u00e4.<\/p><\/li><\/ol><hr data-start=\"13845\" data-end=\"13848\" \/><h1 data-start=\"13850\" data-end=\"13868\">Lyhyt p\u00e4\u00e4telm\u00e4<\/h1><p data-start=\"13870\" data-end=\"14235\">Korkeataajuiset piirilevyt vaativat erikoismateriaaleja ja huolellista prosessinohjausta. Valitse materiaali, joka sopii taajuus- ja l\u00e4mp\u00f6vaatimuksiisi. Hallitse impedanssia ja sijoita maadoitusv\u00e4yl\u00e4t tiiviisti. K\u00e4yt\u00e4 suojausta ja oikeanlaista tehonsuodatusta. Noudata PTFE:n ja muiden mikroaaltolaminaattien erityisi\u00e4 k\u00e4sittelyvaiheita. N\u00e4m\u00e4 vaiheet parantavat suorituskyky\u00e4 ja tuottoa suurtaajuuspiireiss\u00e4.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-brlk2x4 elementor-section-content-top elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"brlk2x4\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7882748\" data-id=\"7882748\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9fc6712 elementor-widget elementor-widget-heading\" data-id=\"9fc6712\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Usein kysytyt kysymykset<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-631b990 elementor-widget elementor-widget-accordion\" data-id=\"631b990\" data-element_type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1031\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-1031\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><svg class=\"e-font-icon-svg e-fas-plus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><svg class=\"e-font-icon-svg e-fas-minus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Mit\u00e4 substraattimateriaaleja k\u00e4ytet\u00e4\u00e4n yleisesti suurtaajuuspiirilevyiss\u00e4?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1031\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-1031\"><p>Tyypillisi\u00e4 materiaaleja ovat PTFE (teflon)-pohjaiset laminaatit ja Rogersin (RO3000\/RO4000\/RT\/duroid) ja Isolan kaltaisten toimittajien suunnitellut komposiitit, jotka on valittu alhaisen h\u00e4vi\u00f6tangentin ja vakaan dielektrisyysvakion vuoksi.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1032\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-1032\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><svg class=\"e-font-icon-svg e-fas-plus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><svg class=\"e-font-icon-svg e-fas-minus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Miksei RF- ja suurtaajuussuunnittelussa voisi k\u00e4ytt\u00e4\u00e4 vain FR-4:\u00e4\u00e4?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1032\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-1032\"><p>FR-4:n dielektrinen h\u00e4vi\u00f6 on suurempi ja dielektrisyysvakio v\u00e4hemm\u00e4n vakaa GHz-taajuuksilla, mik\u00e4 lis\u00e4\u00e4 signaalih\u00e4vi\u00f6t\u00e4 ja impedanssin vaihtelua; monissa RF- tai mikroaaltosovelluksissa PTFE\/Rogers-luokan laminaatit toimivat paljon paremmin.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1033\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-1033\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><svg class=\"e-font-icon-svg e-fas-plus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><svg class=\"e-font-icon-svg e-fas-minus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Mitk\u00e4 s\u00e4hk\u00f6iset ominaisuudet ovat t\u00e4rkeimpi\u00e4 (Dk, h\u00e4vi\u00f6tangentti)?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1033\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-1033\"><p>Dielektrisyysvakio (Dk) s\u00e4\u00e4telee impedanssia ja signaalin nopeutta; h\u00e4vi\u00f6tangentti (Df) s\u00e4\u00e4telee signaalin vaimennusta. Alhainen, vakaa Dk ja alhainen h\u00e4vi\u00f6tangentti ovat v\u00e4ltt\u00e4m\u00e4tt\u00f6mi\u00e4 tasaisen korkeataajuisen suorituskyvyn kannalta.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1034\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-1034\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><svg class=\"e-font-icon-svg e-fas-plus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><svg class=\"e-font-icon-svg e-fas-minus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Tyypillisi\u00e4 sovelluksia suurtaajuuspiirilevyille?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1034\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-1034\"><p>Antennit, RF-vahvistimet, suodattimet, 5G-tukiasemat, mikroaaltoradiolinkit, satelliittiviestint\u00e4, tutkat ja nopeat RF-moduulit.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1035\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-1035\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><svg class=\"e-font-icon-svg e-fas-plus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><svg class=\"e-font-icon-svg e-fas-minus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Miten valitsen oikean korkeataajuuslaminaatin?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1035\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-1035\"><p>Sovita tarvittava taajuusalue, tavoiteimpedanssin vakaus, l\u00e4mp\u00f6-\/CTE-tarpeet ja h\u00e4vi\u00f6tangentti. Tarkista toimittajan tietolehdet (Rogers, Isola jne.) ja pyyd\u00e4 materiaalitestitiedot (Dk\/Df vs. taajuus).<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>What Is a High-Frequency PCB A high-frequency PCB is a special printed circuit board (PCB) used for high electromagnetic frequency [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"parent":1898,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center\";s:15:\"background-size\";s:4:\"auto\";s:21:\"background-attachment\";s:6:\"scroll\";s:15:\"background-type\";s:0:\"\";s:16:\"background-media\";s:0:\"\";s:12:\"overlay-type\";s:0:\"\";s:13:\"overlay-color\";s:0:\"\";s:15:\"overlay-opacity\";s:0:\"\";s:16:\"overlay-gradient\";s:0:\"\";}}"],"footnotes":[""],"_elementor_edit_mode":["builder"],"_elementor_template_type":["wp-page"],"_elementor_data":["[{\"id\":\"2fe9c4e\",\"elType\":\"container\",\"settings\":{\"flex_direction\":\"column\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"05b937f\"}]},\"elements\":[{\"id\":\"f058cdb\",\"elType\":\"widget\",\"settings\":{\"editor\":\"<h2 data-start=\\\"315\\\" data-end=\\\"345\\\">What Is a High-Frequency PCB<\\\/h2><p data-start=\\\"347\\\" data-end=\\\"753\\\">A<a href=\\\"https:\\\/\\\/en.wikipedia.org\\\/wiki\\\/Printed_circuit_board#High_frequency_PCBs\\\"> high-frequency PCB<\\\/a> is a special printed circuit board (PCB) used for high electromagnetic frequency signals. These boards are for radio frequencies above about 300 MHz (wavelength &lt; 1 m) and for microwave frequencies above about 3 GHz (wavelength &lt; 0.1 m). They are made on microwave base copper clad laminates. Production may use some standard rigid PCB steps or use special methods for these materials.<\\\/p><p data-start=\\\"347\\\" data-end=\\\"753\\\"><img class=\\\"alignnone size-full wp-image-2728\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/High-Frequency-PCB.webp\\\" alt=\\\"High-Frequency PCB\\\" width=\\\"600\\\" height=\\\"372\\\" \\\/><\\\/p><p data-start=\\\"755\\\" data-end=\\\"1165\\\">With fast progress in technology, more devices work in the microwave band (&gt;1 GHz) and even in millimeter wave ranges (&gt;30 GHz). This means frequencies rise and material needs increase. Base materials must have very good electrical properties and good chemical stability. As the signal frequency goes up, material loss must stay very low. With the arrival of 5G, high-frequency materials became more important.<\\\/p><hr data-start=\\\"1167\\\" data-end=\\\"1170\\\" \\\/><h1 data-start=\\\"1172\\\" data-end=\\\"1207\\\">Advantages of High-Frequency PCBs<\\\/h1><p data-start=\\\"1209\\\" data-end=\\\"1430\\\"><strong data-start=\\\"1209\\\" data-end=\\\"1231\\\">1. High efficiency<\\\/strong><br data-start=\\\"1231\\\" data-end=\\\"1234\\\" \\\/>Materials with low dielectric constant cause low loss. Modern induction heating and other methods can hit targets and keep high efficiency. These boards also help reduce waste and fit green goals.<\\\/p><p data-start=\\\"1432\\\" data-end=\\\"1677\\\"><strong data-start=\\\"1432\\\" data-end=\\\"1449\\\">2. High speed<\\\/strong><br data-start=\\\"1449\\\" data-end=\\\"1452\\\" \\\/>Signal speed is inversely proportional to the square root of the dielectric constant. Lower dielectric constant means faster transmission. Special materials keep dielectric constant low and stable. This helps signal transfer.<\\\/p><p data-start=\\\"1679\\\" data-end=\\\"1970\\\"><strong data-start=\\\"1679\\\" data-end=\\\"1723\\\">3. Good control of heating or processing<\\\/strong><br data-start=\\\"1723\\\" data-end=\\\"1726\\\" \\\/>High-frequency boards are used in many fields that need precise heating of metal parts. You can control how deep or where to heat. You can focus on surface or deep heating. You can heat in a focused or spread way. The board allows fine control.<\\\/p><p data-start=\\\"1972\\\" data-end=\\\"2316\\\"><strong data-start=\\\"1972\\\" data-end=\\\"1996\\\">4. Strong durability<\\\/strong><br data-start=\\\"1996\\\" data-end=\\\"1999\\\" \\\/>Dielectric constant and dielectric material depend on environment. In humid areas, moisture hurts boards. High-frequency boards made from low water absorption material resist this. They resist chemical corrosion, moisture, high heat, and have high peel strength. These qualities make them strong in hard environments.<\\\/p><hr data-start=\\\"2318\\\" data-end=\\\"2321\\\" \\\/><h1 data-start=\\\"2323\\\" data-end=\\\"2375\\\">Common High-Frequency and High-Speed PCB Materials<\\\/h1><div class=\\\"_tableContainer_sk2ct_1\\\"><div class=\\\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\\\" tabindex=\\\"-1\\\"><table class=\\\"w-fit min-w-(--thread-content-width)\\\" data-start=\\\"2377\\\" data-end=\\\"2727\\\"><thead data-start=\\\"2377\\\" data-end=\\\"2419\\\"><tr data-start=\\\"2377\\\" data-end=\\\"2419\\\"><th data-start=\\\"2377\\\" data-end=\\\"2393\\\" data-col-size=\\\"sm\\\">Brand \\\/ Maker<\\\/th><th data-start=\\\"2393\\\" data-end=\\\"2419\\\" data-col-size=\\\"md\\\">Typical Series \\\/ Types<\\\/th><\\\/tr><\\\/thead><tbody data-start=\\\"2430\\\" data-end=\\\"2727\\\"><tr data-start=\\\"2430\\\" data-end=\\\"2473\\\"><td data-start=\\\"2430\\\" data-end=\\\"2439\\\" data-col-size=\\\"sm\\\">Rogers<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"2439\\\" data-end=\\\"2473\\\">RO4003, RO3003, RO4350, RO5880<\\\/td><\\\/tr><tr data-start=\\\"2474\\\" data-end=\\\"2537\\\"><td data-start=\\\"2474\\\" data-end=\\\"2509\\\" data-col-size=\\\"sm\\\">TUC (Taiyao \\\/ TaYa or TUC brand)<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"2509\\\" data-end=\\\"2537\\\">TUC862, 872SLK, 883, 933<\\\/td><\\\/tr><tr data-start=\\\"2538\\\" data-end=\\\"2574\\\"><td data-start=\\\"2538\\\" data-end=\\\"2550\\\" data-col-size=\\\"sm\\\">Panasonic<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"2550\\\" data-end=\\\"2574\\\">Megtron 4, Megtron 6<\\\/td><\\\/tr><tr data-start=\\\"2575\\\" data-end=\\\"2608\\\"><td data-start=\\\"2575\\\" data-end=\\\"2583\\\" data-col-size=\\\"sm\\\">Isola<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"2583\\\" data-end=\\\"2608\\\">FR408HR, IS620, IS680<\\\/td><\\\/tr><tr data-start=\\\"2609\\\" data-end=\\\"2643\\\"><td data-start=\\\"2609\\\" data-end=\\\"2617\\\" data-col-size=\\\"sm\\\">Nelco<\\\/td><td data-start=\\\"2617\\\" data-end=\\\"2643\\\" data-col-size=\\\"md\\\">N4000-13, N4000-13EPSI<\\\/td><\\\/tr><tr data-start=\\\"2644\\\" data-end=\\\"2727\\\"><td data-start=\\\"2644\\\" data-end=\\\"2670\\\" data-col-size=\\\"sm\\\">Domestic makers (China)<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"2670\\\" data-end=\\\"2727\\\">Dongguan Shengyi, Taizhou Wangling, Taixing Microwave<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div><p data-start=\\\"2729\\\" data-end=\\\"2849\\\">(Use these example materials as a starting point. Each design needs the right material choice for frequency and layout.)<\\\/p><hr data-start=\\\"2851\\\" data-end=\\\"2854\\\" \\\/><h1 data-start=\\\"2856\\\" data-end=\\\"2913\\\">Difference Between High-Frequency Boards and HDI Boards<\\\/h1><p data-start=\\\"2915\\\" data-end=\\\"3218\\\">High-frequency PCBs are for radar, test instruments, automotive collision-avoidance systems, communication satellites, wireless systems, and other fields. HDI (High Density Interconnect) boards are for small devices with many components. HDI often uses double-sided boards in products with small volume.<\\\/p><p data-start=\\\"3220\\\" data-end=\\\"3555\\\">A high-frequency board needs very high process control and precision. Many times designers start from FR-4 glass epoxy, but true high-frequency boards use special laminates. The board must have a small and stable dielectric constant, low dielectric loss, low water absorption, high temperature tolerance, and good corrosion resistance.<\\\/p><p data-start=\\\"3557\\\" data-end=\\\"3824\\\">An HDI board uses micro blind vias to reach high routing density. It has internal and external routing that connect by drilling and plating. HDI is for compact products. Some HDI designs use modular parallel modules and strong DSP control for power and load features.<\\\/p><hr data-start=\\\"3826\\\" data-end=\\\"3829\\\" \\\/><h1 data-start=\\\"3831\\\" data-end=\\\"3880\\\">Types \\\/ Classification of High-Frequency Boards<\\\/h1><p data-start=\\\"3882\\\" data-end=\\\"3938\\\">Below are common types and notes about their processing:<\\\/p><p data-start=\\\"3940\\\" data-end=\\\"3989\\\"><strong data-start=\\\"3940\\\" data-end=\\\"3987\\\">1. Powder-filled thermoset (ceramic filled)<\\\/strong><\\\/p><ul data-start=\\\"3990\\\" data-end=\\\"4260\\\"><li data-start=\\\"3990\\\" data-end=\\\"4078\\\"><p data-start=\\\"3992\\\" data-end=\\\"4078\\\">Materials and suppliers: Rogers 4350B \\\/ 4003C; Arlon 25N \\\/ 25FR; Taconic TLG series.<img class=\\\"size-full wp-image-2730 aligncenter\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/Rogers-4350b.webp\\\" alt=\\\"Rogers 4350b\\\" width=\\\"600\\\" height=\\\"308\\\" \\\/><\\\/p><\\\/li><li data-start=\\\"4079\\\" data-end=\\\"4260\\\"><p data-start=\\\"4081\\\" data-end=\\\"4260\\\">Processing: Steps are similar to FR-4 epoxy glass laminates. However, boards are brittle and easy to break. Tool life for drills and router bits drops about 20%. Handle with care.<\\\/p><\\\/li><\\\/ul><p data-start=\\\"4262\\\" data-end=\\\"4309\\\"><strong data-start=\\\"4262\\\" data-end=\\\"4307\\\">2. PTFE (polytetrafluoroethylene, Teflon)<\\\/strong><\\\/p><ul data-start=\\\"4310\\\" data-end=\\\"5232\\\"><li data-start=\\\"4310\\\" data-end=\\\"4539\\\"><p data-start=\\\"4312\\\" data-end=\\\"4338\\\">Materials and suppliers:<\\\/p><ul data-start=\\\"4341\\\" data-end=\\\"4539\\\"><li data-start=\\\"4341\\\" data-end=\\\"4389\\\"><p data-start=\\\"4343\\\" data-end=\\\"4389\\\">Rogers: RO3000 series, RT series, TMM series<img class=\\\"alignnone size-full wp-image-2731\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/Rogers-RO3003.webp\\\" alt=\\\"Rogers RO3003\\\" width=\\\"600\\\" height=\\\"450\\\" \\\/><\\\/p><\\\/li><li data-start=\\\"4392\\\" data-end=\\\"4439\\\"><p data-start=\\\"4394\\\" data-end=\\\"4439\\\">Arlon: AD\\\/AR series, IsoClad, CuClad series<\\\/p><\\\/li><li data-start=\\\"4442\\\" data-end=\\\"4488\\\"><p data-start=\\\"4444\\\" data-end=\\\"4488\\\">Taconic: RF series, TLX series, TLY series<\\\/p><\\\/li><li data-start=\\\"4491\\\" data-end=\\\"4539\\\"><p data-start=\\\"4493\\\" data-end=\\\"4539\\\">Taixing Microwave: F4B \\\/ F4BM \\\/ F4BK \\\/ TP-2B<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"4540\\\" data-end=\\\"5232\\\"><p data-start=\\\"4542\\\" data-end=\\\"4570\\\">Processing notes for PTFE:<\\\/p><ul data-start=\\\"4573\\\" data-end=\\\"5232\\\"><li data-start=\\\"4573\\\" data-end=\\\"4657\\\"><p data-start=\\\"4575\\\" data-end=\\\"4657\\\">Keep protective film when cutting raw sheets to avoid scratches and press marks.<\\\/p><\\\/li><li data-start=\\\"4660\\\" data-end=\\\"4791\\\"><p data-start=\\\"4662\\\" data-end=\\\"4791\\\">Use new drills (standard #130 drills recommended). For best results, drill one sheet at a time. Keep clamp pressure at ~40 psi.<\\\/p><\\\/li><li data-start=\\\"4794\\\" data-end=\\\"4872\\\"><p data-start=\\\"4796\\\" data-end=\\\"4872\\\">Use aluminum backstop and 1 mm melamine pads to hold PTFE during drilling.<\\\/p><\\\/li><li data-start=\\\"4875\\\" data-end=\\\"4931\\\"><p data-start=\\\"4877\\\" data-end=\\\"4931\\\">After drilling, blow dust out of holes with hot air.<\\\/p><\\\/li><li data-start=\\\"4934\\\" data-end=\\\"5044\\\"><p data-start=\\\"4936\\\" data-end=\\\"5044\\\">Use a stable drill machine. For small holes, increase speed and reduce chip load and spindle return speed.<\\\/p><\\\/li><li data-start=\\\"5047\\\" data-end=\\\"5155\\\"><p data-start=\\\"5049\\\" data-end=\\\"5155\\\">Hole surface treatment: low-temperature plasma or sodium naphthalene activation help hole metallization.<\\\/p><\\\/li><li data-start=\\\"5158\\\" data-end=\\\"5232\\\"><p data-start=\\\"5160\\\" data-end=\\\"5232\\\">PTH (plated through hole) copper deposition and adhesion need attention.<\\\/p><\\\/li><\\\/ul><\\\/li><\\\/ul><p data-start=\\\"5234\\\" data-end=\\\"5264\\\"><strong data-start=\\\"5234\\\" data-end=\\\"5262\\\">3. PTH copper deposition<\\\/strong><\\\/p><ul data-start=\\\"5265\\\" data-end=\\\"5384\\\"><li data-start=\\\"5265\\\" data-end=\\\"5384\\\"><p data-start=\\\"5267\\\" data-end=\\\"5384\\\">After micro-etch (~20 microinch control), perform PTH. If needed, run a second PTH pass as required by board routing.<\\\/p><\\\/li><\\\/ul><p data-start=\\\"5386\\\" data-end=\\\"5427\\\"><strong data-start=\\\"5386\\\" data-end=\\\"5425\\\">4. Solder mask (green mask) process<\\\/strong><\\\/p><ul data-start=\\\"5428\\\" data-end=\\\"5701\\\"><li data-start=\\\"5428\\\" data-end=\\\"5498\\\"><p data-start=\\\"5430\\\" data-end=\\\"5498\\\">Pre-process: use acid\\\/alkaline cleaning; avoid mechanical sanding.<\\\/p><\\\/li><li data-start=\\\"5499\\\" data-end=\\\"5574\\\"><p data-start=\\\"5501\\\" data-end=\\\"5574\\\">After pre-process, bake the board (90\\u00b0C for 30 min) and apply dry film.<\\\/p><\\\/li><li data-start=\\\"5575\\\" data-end=\\\"5701\\\"><p data-start=\\\"5577\\\" data-end=\\\"5701\\\">Bake in three stages: 80\\u00b0C, 100\\u00b0C, 150\\u00b0C, 30 min each. If mask shows oil spots, remove mask and repeat activation treatment.<\\\/p><\\\/li><\\\/ul><p data-start=\\\"5703\\\" data-end=\\\"5741\\\"><strong data-start=\\\"5703\\\" data-end=\\\"5739\\\">5. Routing \\\/ milling PTFE boards<\\\/strong><\\\/p><ul data-start=\\\"5742\\\" data-end=\\\"6038\\\"><li data-start=\\\"5742\\\" data-end=\\\"5835\\\"><p data-start=\\\"5744\\\" data-end=\\\"5835\\\">Use thin paper on PTFE trace side and clamp with FR-4 or phenolic backing during routing.<\\\/p><\\\/li><li data-start=\\\"5836\\\" data-end=\\\"6038\\\"><p data-start=\\\"5838\\\" data-end=\\\"6038\\\">After routing, hand-finish edge burrs and inspect carefully. Avoid damaging copper and board surface. Use sulfur-free separation paper. Reduce burrs well. The routing step must leave good edge finish.<\\\/p><\\\/li><\\\/ul><hr data-start=\\\"6040\\\" data-end=\\\"6043\\\" \\\/><h1 data-start=\\\"6045\\\" data-end=\\\"6093\\\">Production Flow for High-Frequency PTFE Boards<\\\/h1><p data-start=\\\"6095\\\" data-end=\\\"6167\\\">Below are three common process flows. I put them in a table for clarity.<\\\/p><div class=\\\"_tableContainer_sk2ct_1\\\"><div class=\\\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\\\" tabindex=\\\"-1\\\"><table class=\\\"w-fit min-w-(--thread-content-width)\\\" data-start=\\\"6169\\\" data-end=\\\"6917\\\"><thead data-start=\\\"6169\\\" data-end=\\\"6207\\\"><tr data-start=\\\"6169\\\" data-end=\\\"6207\\\"><th data-start=\\\"6169\\\" data-end=\\\"6184\\\" data-col-size=\\\"sm\\\">Process Type<\\\/th><th data-start=\\\"6184\\\" data-end=\\\"6207\\\" data-col-size=\\\"xl\\\">Key Steps (summary)<\\\/th><\\\/tr><\\\/thead><tbody data-start=\\\"6218\\\" data-end=\\\"6917\\\"><tr data-start=\\\"6218\\\" data-end=\\\"6482\\\"><td data-start=\\\"6218\\\" data-end=\\\"6260\\\" data-col-size=\\\"sm\\\">NPTH (Non-Plated Through Hole) for PTFE<\\\/td><td data-col-size=\\\"xl\\\" data-start=\\\"6260\\\" data-end=\\\"6482\\\">Cutting \\u2192 Drilling \\u2192 Dry film \\u2192 Inspection \\u2192 Etch \\u2192 Etch inspection \\u2192 Solder mask \\u2192 Dry film exposure \\u2192 Hot air solder leveling (HASL) or tin spray \\u2192 Routing\\\/shaping \\u2192 Inspection \\u2192 Final inspection \\u2192 Packing \\u2192 Delivery<\\\/td><\\\/tr><tr data-start=\\\"6483\\\" data-end=\\\"6822\\\"><td data-start=\\\"6483\\\" data-end=\\\"6520\\\" data-col-size=\\\"sm\\\">PTH (Plated Through Hole) for PTFE<\\\/td><td data-col-size=\\\"xl\\\" data-start=\\\"6520\\\" data-end=\\\"6822\\\">Cutting \\u2192 Drilling \\u2192 Hole treatment (low-temp plasma or sodium naphthalene activation) \\u2192 Copper plating \\u2192 Panel electrical test \\u2192 Dry film \\u2192 Inspection \\u2192 Imaging \\u2192 Etch \\u2192 Etch inspection \\u2192 Solder mask \\u2192 Dry film exposure \\u2192 HASL \\u2192 Routing\\\/shaping \\u2192 Inspection \\u2192 Final inspection \\u2192 Packing \\u2192 Delivery<\\\/td><\\\/tr><tr data-start=\\\"6823\\\" data-end=\\\"6917\\\"><td data-start=\\\"6823\\\" data-end=\\\"6854\\\" data-col-size=\\\"sm\\\">Solder mask process controls<\\\/td><td data-col-size=\\\"xl\\\" data-start=\\\"6854\\\" data-end=\\\"6917\\\">Control green mask adhesion and bubble formation carefully.<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div><p data-start=\\\"6919\\\" data-end=\\\"6999\\\">Note: Each process step must control surface scratch and other defects strictly.<\\\/p><hr data-start=\\\"7001\\\" data-end=\\\"7004\\\" \\\/><h1 data-start=\\\"7006\\\" data-end=\\\"7043\\\">Applications of High-Frequency PCBs<\\\/h1><p data-start=\\\"7045\\\" data-end=\\\"7084\\\">High-frequency PCBs commonly appear in:<\\\/p><ul data-start=\\\"7086\\\" data-end=\\\"7468\\\"><li data-start=\\\"7086\\\" data-end=\\\"7137\\\"><p data-start=\\\"7088\\\" data-end=\\\"7137\\\">Power amplifiers and low noise amplifiers (LNA)<\\\/p><\\\/li><li data-start=\\\"7138\\\" data-end=\\\"7198\\\"><p data-start=\\\"7140\\\" data-end=\\\"7198\\\">Mobile communication products and smart lighting systems<\\\/p><\\\/li><li data-start=\\\"7199\\\" data-end=\\\"7273\\\"><p data-start=\\\"7201\\\" data-end=\\\"7273\\\">Power dividers, couplers, duplexers, filters and other passive devices<\\\/p><\\\/li><li data-start=\\\"7274\\\" data-end=\\\"7366\\\"><p data-start=\\\"7276\\\" data-end=\\\"7366\\\">Automotive collision avoidance systems, communication satellites, wireless phone systems<\\\/p><\\\/li><li data-start=\\\"7367\\\" data-end=\\\"7468\\\"><p data-start=\\\"7369\\\" data-end=\\\"7468\\\">In short, electronics are moving to higher frequencies and high-frequency boards follow this trend.<\\\/p><\\\/li><\\\/ul><hr data-start=\\\"7470\\\" data-end=\\\"7473\\\" \\\/><h1 data-start=\\\"7475\\\" data-end=\\\"7510\\\">How to Design High-Frequency PCBs<\\\/h1><p data-start=\\\"7512\\\" data-end=\\\"7840\\\">In high-frequency PCB design, power plane layout is critical. Usually put power on its own layer. This helps the circuit follow the path of least impedance. Power plane must provide return paths for all signals on the PCB. That lowers loop area and reduces noise. Low-frequency designers often ignore some of these noise issues.<\\\/p><p data-start=\\\"7842\\\" data-end=\\\"7890\\\">Follow these rules in high-frequency PCB design:<\\\/p><ul data-start=\\\"7892\\\" data-end=\\\"8086\\\"><li data-start=\\\"7892\\\" data-end=\\\"7937\\\"><p data-start=\\\"7894\\\" data-end=\\\"7937\\\">Keep power and ground stable and unified.<\\\/p><\\\/li><li data-start=\\\"7938\\\" data-end=\\\"8001\\\"><p data-start=\\\"7940\\\" data-end=\\\"8001\\\">Careful routing and correct termination remove reflections.<\\\/p><\\\/li><li data-start=\\\"8002\\\" data-end=\\\"8086\\\"><p data-start=\\\"8004\\\" data-end=\\\"8086\\\">Careful routing and correct termination reduce capacitance and measured crosstalk.<\\\/p><\\\/li><\\\/ul><p data-start=\\\"8088\\\" data-end=\\\"8124\\\">Below I expand several key subjects.<\\\/p><h2 data-start=\\\"8126\\\" data-end=\\\"8156\\\">(1) Transmission line width<\\\/h2><p data-start=\\\"8158\\\" data-end=\\\"8249\\\">Transmission line width in high-frequency PCB design must follow impedance matching theory.<\\\/p><p data-start=\\\"8251\\\" data-end=\\\"8701\\\"><strong data-start=\\\"8251\\\" data-end=\\\"8273\\\">Impedance matching<\\\/strong><br data-start=\\\"8273\\\" data-end=\\\"8276\\\" \\\/>When input\\\/output impedance and transmission line impedance match, the system gives maximum output power and minimum reflection. For microwave circuits, matching must also consider device bias points. Vias on signal lines change transmission properties. For TTL and CMOS, characteristic impedance is high, so the effect is small. But for 50 \\u03a9 low-impedance RF lines, vias must be considered. Usually avoid vias on such lines.<\\\/p><h2 data-start=\\\"8703\\\" data-end=\\\"8755\\\">(2) Crosstalk between parallel transmission lines<\\\/h2><p data-start=\\\"8757\\\" data-end=\\\"9122\\\">When two microstrip lines run close and parallel, coupling occurs. They cause crosstalk and change line characteristic impedance. Pay attention for 50 \\u03a9 and 75 \\u03a9 circuits. Designers can use coupling for some functions, such as directional couplers or power measurement. Example values from one design (1.97 GHz PCS end base station amplifier, dielectric \\u03b5r = 3.48):<\\\/p><ul data-start=\\\"9124\\\" data-end=\\\"9266\\\"><li data-start=\\\"9124\\\" data-end=\\\"9195\\\"><p data-start=\\\"9126\\\" data-end=\\\"9195\\\">For a 10 dB directional coupler: S = 5 mil, l = 920 mil, W = 53 mil<\\\/p><\\\/li><li data-start=\\\"9196\\\" data-end=\\\"9266\\\"><p data-start=\\\"9198\\\" data-end=\\\"9266\\\">For a 20 dB directional coupler: S = 35 mil, l = 920 mil, W = 62 mil<\\\/p><\\\/li><\\\/ul><p data-start=\\\"9268\\\" data-end=\\\"9308\\\">To reduce crosstalk, follow these rules:<\\\/p><p data-start=\\\"9310\\\" data-end=\\\"9556\\\">A. Keep spacing S between high-frequency or high-speed parallel lines at least one line width.<br data-start=\\\"9404\\\" data-end=\\\"9407\\\" \\\/>B. Cut down parallel length where possible.<br data-start=\\\"9450\\\" data-end=\\\"9453\\\" \\\/>C. Keep tiny high-frequency signals away from power and logic lines that can cause strong interference.<\\\/p><h2 data-start=\\\"9558\\\" data-end=\\\"9600\\\">(3) Ground via electromagnetic analysis<\\\/h2><p data-start=\\\"9602\\\" data-end=\\\"10021\\\">For IC ground pins or other ground pins, put ground vias close to pins in high-frequency circuits. The idea: a short ground path acts like an inductive impedance. Ground via also looks inductive. This affects filter function. That is why place ground vias close to pins. To reduce inductive load, use more ground vias than in low-frequency boards. This raises ground current capacity and helps keep all points near 0 V.<\\\/p><h2 data-start=\\\"10023\\\" data-end=\\\"10045\\\">(4) Power filtering<\\\/h2><p data-start=\\\"10047\\\" data-end=\\\"10529\\\">For TTL and CMOS, designers add bypass capacitors near power pins to reduce logic noise. For high-frequency and microwave circuits, this is not enough. High-frequency signals make high-frequency interference on power. Use series inductors and capacitors. Choose inductors by working frequency. Example: to filter &gt;1 MHz noise with C = 0.1 \\u03bcF, pick L = 1 \\u03bcH. When adding inductance on collector open-circuit signal pins, be careful. The inductor acts like a matching inductance then.<\\\/p><h2 data-start=\\\"10531\\\" data-end=\\\"10547\\\">(5) Shielding<\\\/h2><p data-start=\\\"10549\\\" data-end=\\\"10680\\\">Use shielding to protect small or high-frequency signals. This reduces strong signal interference and reduces EMI. Some guidelines:<\\\/p><p data-start=\\\"10682\\\" data-end=\\\"10902\\\">A. In low frequency digital\\\/analog (&lt;30 MHz) small-signal designs, split digital and analog grounds, and pour ground plane in small-signal zones. Keep distance between ground pour and traces greater than the trace width.<\\\/p><p data-start=\\\"10904\\\" data-end=\\\"11021\\\">B. In high-frequency digital\\\/analog small-signal design, add shielding cans or stitched ground vias to isolate areas.<\\\/p><p data-start=\\\"10904\\\" data-end=\\\"11021\\\"><img class=\\\"alignnone size-full wp-image-2729\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/Isola-PCB.webp\\\" alt=\\\"Isola-PCB\\\" width=\\\"600\\\" height=\\\"449\\\" \\\/><\\\/p><p data-start=\\\"11023\\\" data-end=\\\"11245\\\">C. For high-power high-frequency circuits, make the high-frequency part a separate functional module and add a metal shield box to lower radiation. For example, optical fiber transceiver modules at 155 M, 622 M, or 2 Gb\\\/s.<\\\/p><p data-start=\\\"11247\\\" data-end=\\\"11435\\\">A multi-layer PCB for mobile phone (example: Nokia 6110) may place components on both sides and use internal ground pours as shown in the original figure. (Figure references omitted here.)<\\\/p><hr data-start=\\\"11437\\\" data-end=\\\"11440\\\" \\\/><h1 data-start=\\\"11442\\\" data-end=\\\"11490\\\">Examples of Material Selection for High Boards<\\\/h1><p data-start=\\\"11492\\\" data-end=\\\"11548\\\">Below are examples from boards we designed and debugged:<\\\/p><div class=\\\"_tableContainer_sk2ct_1\\\"><div class=\\\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\\\" tabindex=\\\"-1\\\"><table class=\\\"w-fit min-w-(--thread-content-width)\\\" data-start=\\\"11550\\\" data-end=\\\"12491\\\"><thead data-start=\\\"11550\\\" data-end=\\\"11608\\\"><tr data-start=\\\"11550\\\" data-end=\\\"11608\\\"><th data-start=\\\"11550\\\" data-end=\\\"11580\\\" data-col-size=\\\"sm\\\">Application (freq \\\/ device)<\\\/th><th data-start=\\\"11580\\\" data-end=\\\"11599\\\" data-col-size=\\\"md\\\">Material \\\/ Stack<\\\/th><th data-start=\\\"11599\\\" data-end=\\\"11608\\\" data-col-size=\\\"md\\\">Notes<\\\/th><\\\/tr><\\\/thead><tbody data-start=\\\"11624\\\" data-end=\\\"12491\\\"><tr data-start=\\\"11624\\\" data-end=\\\"11797\\\"><td data-start=\\\"11624\\\" data-end=\\\"11656\\\" data-col-size=\\\"sm\\\">2.4 GHz spread spectrum relay<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11656\\\" data-end=\\\"11700\\\">FR-4, 4-layer PCB with large ground pours<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11700\\\" data-end=\\\"11797\\\">High-frequency analog part separated. Power lines use inductors to isolate from digital part.<\\\/td><\\\/tr><tr data-start=\\\"11798\\\" data-end=\\\"11939\\\"><td data-start=\\\"11798\\\" data-end=\\\"11823\\\" data-col-size=\\\"sm\\\">2.4 GHz RF transceiver<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11823\\\" data-end=\\\"11859\\\">PTFE material, double-sided board<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11859\\\" data-end=\\\"11939\\\">RF transmit and receive in separate metal shield cans; power input filtered.<\\\/td><\\\/tr><tr data-start=\\\"11940\\\" data-end=\\\"12035\\\"><td data-start=\\\"11940\\\" data-end=\\\"11965\\\" data-col-size=\\\"sm\\\">1.9 GHz RF transceiver<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11965\\\" data-end=\\\"11994\\\">PTFE material, 4-layer PCB<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11994\\\" data-end=\\\"12035\\\">Use large ground pours and shielding.<\\\/td><\\\/tr><tr data-start=\\\"12036\\\" data-end=\\\"12123\\\"><td data-start=\\\"12036\\\" data-end=\\\"12061\\\" data-col-size=\\\"sm\\\">140 MHz IF transceiver<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12061\\\" data-end=\\\"12086\\\">Top layer S1139 0.3 mm<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12086\\\" data-end=\\\"12123\\\">Large ground pour; via isolation.<\\\/td><\\\/tr><tr data-start=\\\"12124\\\" data-end=\\\"12223\\\"><td data-start=\\\"12124\\\" data-end=\\\"12148\\\" data-col-size=\\\"sm\\\">70 MHz IF transceiver<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12148\\\" data-end=\\\"12168\\\">FR-4, 4-layer PCB<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12168\\\" data-end=\\\"12223\\\">Large ground pour; module isolation via via fences.<\\\/td><\\\/tr><tr data-start=\\\"12224\\\" data-end=\\\"12385\\\"><td data-start=\\\"12224\\\" data-end=\\\"12247\\\" data-col-size=\\\"sm\\\">30 W power amplifier<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12247\\\" data-end=\\\"12283\\\">RO4350 material, double-sided PCB<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12283\\\" data-end=\\\"12385\\\">Large ground pour; spacing controlled to &gt;= 50 \\u03a9 line width; shield box and power input filtering.<\\\/td><\\\/tr><tr data-start=\\\"12386\\\" data-end=\\\"12491\\\"><td data-start=\\\"12386\\\" data-end=\\\"12414\\\" data-col-size=\\\"sm\\\">2000 MHz microwave source<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12414\\\" data-end=\\\"12433\\\">S1139 0.8 mm top<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12433\\\" data-end=\\\"12491\\\">Double-sided PCB; precise control of trace dimensions.<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div><p data-start=\\\"12493\\\" data-end=\\\"12573\\\">Use these as examples. Each project needs its own material and thickness choice.<\\\/p><hr data-start=\\\"12575\\\" data-end=\\\"12578\\\" \\\/><h1 data-start=\\\"12580\\\" data-end=\\\"12622\\\">High-Frequency PCB Material Requirements<\\\/h1><p data-start=\\\"12624\\\" data-end=\\\"12677\\\">Designers should check these key material properties:<\\\/p><ol data-start=\\\"12679\\\" data-end=\\\"13167\\\"><li data-start=\\\"12679\\\" data-end=\\\"12784\\\"><p data-start=\\\"12682\\\" data-end=\\\"12784\\\"><strong data-start=\\\"12682\\\" data-end=\\\"12720\\\">Dielectric loss (Df, loss tangent)<\\\/strong> must be very small. Small loss means less signal attenuation.<\\\/p><\\\/li><li data-start=\\\"12785\\\" data-end=\\\"12884\\\"><p data-start=\\\"12788\\\" data-end=\\\"12884\\\"><strong data-start=\\\"12788\\\" data-end=\\\"12812\\\">Low water absorption<\\\/strong> is important. High water uptake changes dielectric constant and loss.<\\\/p><\\\/li><li data-start=\\\"12885\\\" data-end=\\\"13021\\\"><p data-start=\\\"12888\\\" data-end=\\\"13021\\\"><strong data-start=\\\"12888\\\" data-end=\\\"12916\\\">Dielectric constant (DK)<\\\/strong> must be low and stable. Lower DK gives higher signal speed. DK stability also helps impedance control.<\\\/p><\\\/li><li data-start=\\\"13022\\\" data-end=\\\"13167\\\"><p data-start=\\\"13025\\\" data-end=\\\"13167\\\"><strong data-start=\\\"13025\\\" data-end=\\\"13050\\\">CTE and thermal match<\\\/strong> between copper foil and base must be similar. Large mismatch over temperature changes can cause copper delamination.<\\\/p><\\\/li><\\\/ol><p data-start=\\\"13169\\\" data-end=\\\"13256\\\">High frequency often means use of fluoropolymer substrates like PTFE (known as Teflon).<\\\/p><hr data-start=\\\"13258\\\" data-end=\\\"13261\\\" \\\/><h1 data-start=\\\"13263\\\" data-end=\\\"13321\\\">Manufacturing Notes and Cautions for High-Frequency PCBs<\\\/h1><ol data-start=\\\"13323\\\" data-end=\\\"13843\\\"><li data-start=\\\"13323\\\" data-end=\\\"13424\\\"><p data-start=\\\"13326\\\" data-end=\\\"13424\\\"><strong data-start=\\\"13326\\\" data-end=\\\"13358\\\">Impedance control is strict.<\\\/strong> Line width tolerance is tight. Typical control tolerance ~ \\u00b12%.<\\\/p><\\\/li><li data-start=\\\"13425\\\" data-end=\\\"13580\\\"><p data-start=\\\"13428\\\" data-end=\\\"13580\\\"><strong data-start=\\\"13428\\\" data-end=\\\"13473\\\">PTH adhesion is low on special materials.<\\\/strong> Use plasma surface roughening for holes and surfaces to increase adhesion for plating and solder resist.<\\\/p><\\\/li><li data-start=\\\"13581\\\" data-end=\\\"13711\\\"><p data-start=\\\"13584\\\" data-end=\\\"13711\\\"><strong data-start=\\\"13584\\\" data-end=\\\"13627\\\">Do not sand the board before soldering.<\\\/strong> This reduces adhesion. Use micro-etch solutions or other roughening methods only.<\\\/p><\\\/li><li data-start=\\\"13712\\\" data-end=\\\"13843\\\"><p data-start=\\\"13715\\\" data-end=\\\"13843\\\"><strong data-start=\\\"13715\\\" data-end=\\\"13783\\\">PTFE boards often cause rough edges with standard milling tools.<\\\/strong> Use special milling bits and follow PTFE routing practices.<\\\/p><\\\/li><\\\/ol><hr data-start=\\\"13845\\\" data-end=\\\"13848\\\" \\\/><h1 data-start=\\\"13850\\\" data-end=\\\"13868\\\">Short Conclusion<\\\/h1><p data-start=\\\"13870\\\" data-end=\\\"14235\\\">High-frequency PCBs need special materials and careful process control. Choose a material that fits your frequency and thermal needs. Control impedance and place ground vias closely. Use shielding and correct power filtering. Follow special handling steps for PTFE and other microwave laminates. These steps improve performance and yield in high-frequency circuits.<\\\/p>\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"18e069d\"}]},\"elements\":[],\"widgetType\":\"text-editor\"}],\"isInner\":false},{\"id\":\"brlk2x4\",\"elType\":\"section\",\"settings\":{\"gap\":\"no\",\"content_position\":\"top\",\"background_background\":\"classic\",\"background_color\":\"#FFFFFF00\",\"background_position\":\"bottom center\",\"background_attachment\":\"scroll\",\"background_repeat\":\"no-repeat\",\"background_size\":\"cover\",\"background_size_mobile\":\"cover\",\"background_overlay_background\":\"classic\",\"background_overlay_color_b\":\"rgba(255,255,255,0)\",\"background_overlay_opacity\":{\"unit\":\"px\",\"size\":\"\",\"sizes\":[]},\"padding\":{\"unit\":\"px\",\"top\":\"120\",\"right\":\"0\",\"bottom\":\"120\",\"left\":\"0\",\"isLinked\":false},\"padding_tablet\":{\"unit\":\"px\",\"top\":\"80\",\"right\":\"40\",\"bottom\":\"80\",\"left\":\"40\",\"isLinked\":false},\"padding_mobile\":{\"unit\":\"px\",\"top\":\"50\",\"right\":\"25\",\"bottom\":\"50\",\"left\":\"25\",\"isLinked\":false},\"content_width\":{\"unit\":\"px\",\"size\":800,\"sizes\":[]},\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"ba03a0b\"}]},\"elements\":[{\"id\":\"7882748\",\"elType\":\"column\",\"settings\":{\"_column_size\":100,\"_inline_size\":null,\"padding\":{\"unit\":\"px\",\"top\":\"0\",\"right\":\"0\",\"bottom\":\"0\",\"left\":\"0\",\"isLinked\":true},\"space_between_widgets\":40,\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"2d9ed40\"}]},\"elements\":[{\"id\":\"9fc6712\",\"elType\":\"widget\",\"settings\":{\"title\":\"Frequently Asked Questions\",\"align\":\"center\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"e54e767\"}]},\"elements\":[],\"widgetType\":\"heading\"},{\"id\":\"631b990\",\"elType\":\"widget\",\"settings\":{\"tabs\":[{\"tab_title\":\"Which substrate materials are commonly used for high-frequency PCBs?\",\"tab_content\":\"<p>Typical materials include PTFE (Teflon)-based laminates and engineered composites from suppliers like Rogers (RO3000\\\/RO4000\\\/RT\\\/duroid) and Isola, chosen for low loss tangent and stable dielectric constant.<\\\/p>\",\"_id\":\"1f7b19c\"},{\"_id\":\"bbc686c\",\"tab_title\":\"Why not just use FR-4 for RF\\\/high-frequency designs?\",\"tab_content\":\"<p>FR-4 has higher dielectric loss and less stable dielectric constant at GHz frequencies, which increases signal loss and impedance variability; for many RF or microwave applications, PTFE\\\/Rogers-class laminates perform much better.<\\\/p>\"},{\"_id\":\"1456b39\",\"tab_title\":\"What electrical properties matter most (Dk, loss tangent)?\",\"tab_content\":\"<p>Dielectric constant (Dk) controls impedance and signal velocity; loss tangent (Df) governs signal attenuation. 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class=\\\"elementor-element elementor-element-2fe9c4e e-flex e-con-boxed e-con e-parent\\\" data-id=\\\"2fe9c4e\\\" data-element_type=\\\"container\\\">\\n\\t\\t\\t\\t\\t<div class=\\\"e-con-inner\\\">\\n\\t\\t[elementor-element k=\\\"0e46bd9387093ca73b9000e38f18cce4\\\" data=\\\"{"id":"f058cdb","elType":"widget","settings":{"editor":"<h2 data-start=\"315\" data-end=\"345\">What Is a High-Frequency PCB<\/h2><p data-start=\"347\" data-end=\"753\">A<a href=\"https:\/\/en.wikipedia.org\/wiki\/Printed_circuit_board#High_frequency_PCBs\"> high-frequency PCB<\/a> is a special printed circuit board (PCB) used for high electromagnetic frequency signals. These boards are for radio frequencies above about 300 MHz (wavelength &lt; 1 m) and for microwave frequencies above about 3 GHz (wavelength &lt; 0.1 m). They are made on microwave base copper clad laminates. Production may use some standard rigid PCB steps or use special methods for these materials.<\/p><p data-start=\"347\" data-end=\"753\"><img class=\"alignnone size-full wp-image-2728\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/High-Frequency-PCB.webp\" alt=\"High-Frequency PCB\" width=\"600\" height=\"372\" \/><\/p><p data-start=\"755\" data-end=\"1165\">With fast progress in technology, more devices work in the microwave band (&gt;1 GHz) and even in millimeter wave ranges (&gt;30 GHz). This means frequencies rise and material needs increase. Base materials must have very good electrical properties and good chemical stability. As the signal frequency goes up, material loss must stay very low. With the arrival of 5G, high-frequency materials became more important.<\/p><hr data-start=\"1167\" data-end=\"1170\" \/><h1 data-start=\"1172\" data-end=\"1207\">Advantages of High-Frequency PCBs<\/h1><p data-start=\"1209\" data-end=\"1430\"><strong data-start=\"1209\" data-end=\"1231\">1. High efficiency<\/strong><br data-start=\"1231\" data-end=\"1234\" \/>Materials with low dielectric constant cause low loss. Modern induction heating and other methods can hit targets and keep high efficiency. These boards also help reduce waste and fit green goals.<\/p><p data-start=\"1432\" data-end=\"1677\"><strong data-start=\"1432\" data-end=\"1449\">2. High speed<\/strong><br data-start=\"1449\" data-end=\"1452\" \/>Signal speed is inversely proportional to the square root of the dielectric constant. Lower dielectric constant means faster transmission. Special materials keep dielectric constant low and stable. This helps signal transfer.<\/p><p data-start=\"1679\" data-end=\"1970\"><strong data-start=\"1679\" data-end=\"1723\">3. Good control of heating or processing<\/strong><br data-start=\"1723\" data-end=\"1726\" \/>High-frequency boards are used in many fields that need precise heating of metal parts. You can control how deep or where to heat. You can focus on surface or deep heating. You can heat in a focused or spread way. The board allows fine control.<\/p><p data-start=\"1972\" data-end=\"2316\"><strong data-start=\"1972\" data-end=\"1996\">4. Strong durability<\/strong><br data-start=\"1996\" data-end=\"1999\" \/>Dielectric constant and dielectric material depend on environment. In humid areas, moisture hurts boards. High-frequency boards made from low water absorption material resist this. They resist chemical corrosion, moisture, high heat, and have high peel strength. These qualities make them strong in hard environments.<\/p><hr data-start=\"2318\" data-end=\"2321\" \/><h1 data-start=\"2323\" data-end=\"2375\">Common High-Frequency and High-Speed PCB Materials<\/h1><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"2377\" data-end=\"2727\"><thead data-start=\"2377\" data-end=\"2419\"><tr data-start=\"2377\" data-end=\"2419\"><th data-start=\"2377\" data-end=\"2393\" data-col-size=\"sm\">Brand \/ Maker<\/th><th data-start=\"2393\" data-end=\"2419\" data-col-size=\"md\">Typical Series \/ Types<\/th><\/tr><\/thead><tbody data-start=\"2430\" data-end=\"2727\"><tr data-start=\"2430\" data-end=\"2473\"><td data-start=\"2430\" data-end=\"2439\" data-col-size=\"sm\">Rogers<\/td><td data-col-size=\"md\" data-start=\"2439\" data-end=\"2473\">RO4003, RO3003, RO4350, RO5880<\/td><\/tr><tr data-start=\"2474\" data-end=\"2537\"><td data-start=\"2474\" data-end=\"2509\" data-col-size=\"sm\">TUC (Taiyao \/ TaYa or TUC brand)<\/td><td data-col-size=\"md\" data-start=\"2509\" data-end=\"2537\">TUC862, 872SLK, 883, 933<\/td><\/tr><tr data-start=\"2538\" data-end=\"2574\"><td data-start=\"2538\" data-end=\"2550\" data-col-size=\"sm\">Panasonic<\/td><td data-col-size=\"md\" data-start=\"2550\" data-end=\"2574\">Megtron 4, Megtron 6<\/td><\/tr><tr data-start=\"2575\" data-end=\"2608\"><td data-start=\"2575\" data-end=\"2583\" data-col-size=\"sm\">Isola<\/td><td data-col-size=\"md\" data-start=\"2583\" data-end=\"2608\">FR408HR, IS620, IS680<\/td><\/tr><tr data-start=\"2609\" data-end=\"2643\"><td data-start=\"2609\" data-end=\"2617\" data-col-size=\"sm\">Nelco<\/td><td data-start=\"2617\" data-end=\"2643\" data-col-size=\"md\">N4000-13, N4000-13EPSI<\/td><\/tr><tr data-start=\"2644\" data-end=\"2727\"><td data-start=\"2644\" data-end=\"2670\" data-col-size=\"sm\">Domestic makers (China)<\/td><td data-col-size=\"md\" data-start=\"2670\" data-end=\"2727\">Dongguan Shengyi, Taizhou Wangling, Taixing Microwave<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"2729\" data-end=\"2849\">(Use these example materials as a starting point. Each design needs the right material choice for frequency and layout.)<\/p><hr data-start=\"2851\" data-end=\"2854\" \/><h1 data-start=\"2856\" data-end=\"2913\">Difference Between High-Frequency Boards and HDI Boards<\/h1><p data-start=\"2915\" data-end=\"3218\">High-frequency PCBs are for radar, test instruments, automotive collision-avoidance systems, communication satellites, wireless systems, and other fields. HDI (High Density Interconnect) boards are for small devices with many components. HDI often uses double-sided boards in products with small volume.<\/p><p data-start=\"3220\" data-end=\"3555\">A high-frequency board needs very high process control and precision. Many times designers start from FR-4 glass epoxy, but true high-frequency boards use special laminates. The board must have a small and stable dielectric constant, low dielectric loss, low water absorption, high temperature tolerance, and good corrosion resistance.<\/p><p data-start=\"3557\" data-end=\"3824\">An HDI board uses micro blind vias to reach high routing density. It has internal and external routing that connect by drilling and plating. HDI is for compact products. Some HDI designs use modular parallel modules and strong DSP control for power and load features.<\/p><hr data-start=\"3826\" data-end=\"3829\" \/><h1 data-start=\"3831\" data-end=\"3880\">Types \/ Classification of High-Frequency Boards<\/h1><p data-start=\"3882\" data-end=\"3938\">Below are common types and notes about their processing:<\/p><p data-start=\"3940\" data-end=\"3989\"><strong data-start=\"3940\" data-end=\"3987\">1. Powder-filled thermoset (ceramic filled)<\/strong><\/p><ul data-start=\"3990\" data-end=\"4260\"><li data-start=\"3990\" data-end=\"4078\"><p data-start=\"3992\" data-end=\"4078\">Materials and suppliers: Rogers 4350B \/ 4003C; Arlon 25N \/ 25FR; Taconic TLG series.<img class=\"size-full wp-image-2730 aligncenter\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-4350b.webp\" alt=\"Rogers 4350b\" width=\"600\" height=\"308\" \/><\/p><\/li><li data-start=\"4079\" data-end=\"4260\"><p data-start=\"4081\" data-end=\"4260\">Processing: Steps are similar to FR-4 epoxy glass laminates. However, boards are brittle and easy to break. Tool life for drills and router bits drops about 20%. Handle with care.<\/p><\/li><\/ul><p data-start=\"4262\" data-end=\"4309\"><strong data-start=\"4262\" data-end=\"4307\">2. PTFE (polytetrafluoroethylene, Teflon)<\/strong><\/p><ul data-start=\"4310\" data-end=\"5232\"><li data-start=\"4310\" data-end=\"4539\"><p data-start=\"4312\" data-end=\"4338\">Materials and suppliers:<\/p><ul data-start=\"4341\" data-end=\"4539\"><li data-start=\"4341\" data-end=\"4389\"><p data-start=\"4343\" data-end=\"4389\">Rogers: RO3000 series, RT series, TMM series<img class=\"alignnone size-full wp-image-2731\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-RO3003.webp\" alt=\"Rogers RO3003\" width=\"600\" height=\"450\" \/><\/p><\/li><li data-start=\"4392\" data-end=\"4439\"><p data-start=\"4394\" data-end=\"4439\">Arlon: AD\/AR series, IsoClad, CuClad series<\/p><\/li><li data-start=\"4442\" data-end=\"4488\"><p data-start=\"4444\" data-end=\"4488\">Taconic: RF series, TLX series, TLY series<\/p><\/li><li data-start=\"4491\" data-end=\"4539\"><p data-start=\"4493\" data-end=\"4539\">Taixing Microwave: F4B \/ F4BM \/ F4BK \/ TP-2B<\/p><\/li><\/ul><\/li><li data-start=\"4540\" data-end=\"5232\"><p data-start=\"4542\" data-end=\"4570\">Processing notes for PTFE:<\/p><ul data-start=\"4573\" data-end=\"5232\"><li data-start=\"4573\" data-end=\"4657\"><p data-start=\"4575\" data-end=\"4657\">Keep protective film when cutting raw sheets to avoid scratches and press marks.<\/p><\/li><li data-start=\"4660\" data-end=\"4791\"><p data-start=\"4662\" data-end=\"4791\">Use new drills (standard #130 drills recommended). For best results, drill one sheet at a time. Keep clamp pressure at ~40 psi.<\/p><\/li><li data-start=\"4794\" data-end=\"4872\"><p data-start=\"4796\" data-end=\"4872\">Use aluminum backstop and 1 mm melamine pads to hold PTFE during drilling.<\/p><\/li><li data-start=\"4875\" data-end=\"4931\"><p data-start=\"4877\" data-end=\"4931\">After drilling, blow dust out of holes with hot air.<\/p><\/li><li data-start=\"4934\" data-end=\"5044\"><p data-start=\"4936\" data-end=\"5044\">Use a stable drill machine. For small holes, increase speed and reduce chip load and spindle return speed.<\/p><\/li><li data-start=\"5047\" data-end=\"5155\"><p data-start=\"5049\" data-end=\"5155\">Hole surface treatment: low-temperature plasma or sodium naphthalene activation help hole metallization.<\/p><\/li><li data-start=\"5158\" data-end=\"5232\"><p data-start=\"5160\" data-end=\"5232\">PTH (plated through hole) copper deposition and adhesion need attention.<\/p><\/li><\/ul><\/li><\/ul><p data-start=\"5234\" data-end=\"5264\"><strong data-start=\"5234\" data-end=\"5262\">3. PTH copper deposition<\/strong><\/p><ul data-start=\"5265\" data-end=\"5384\"><li data-start=\"5265\" data-end=\"5384\"><p data-start=\"5267\" data-end=\"5384\">After micro-etch (~20 microinch control), perform PTH. If needed, run a second PTH pass as required by board routing.<\/p><\/li><\/ul><p data-start=\"5386\" data-end=\"5427\"><strong data-start=\"5386\" data-end=\"5425\">4. Solder mask (green mask) process<\/strong><\/p><ul data-start=\"5428\" data-end=\"5701\"><li data-start=\"5428\" data-end=\"5498\"><p data-start=\"5430\" data-end=\"5498\">Pre-process: use acid\/alkaline cleaning; avoid mechanical sanding.<\/p><\/li><li data-start=\"5499\" data-end=\"5574\"><p data-start=\"5501\" data-end=\"5574\">After pre-process, bake the board (90\u00b0C for 30 min) and apply dry film.<\/p><\/li><li data-start=\"5575\" data-end=\"5701\"><p data-start=\"5577\" data-end=\"5701\">Bake in three stages: 80\u00b0C, 100\u00b0C, 150\u00b0C, 30 min each. If mask shows oil spots, remove mask and repeat activation treatment.<\/p><\/li><\/ul><p data-start=\"5703\" data-end=\"5741\"><strong data-start=\"5703\" data-end=\"5739\">5. Routing \/ milling PTFE boards<\/strong><\/p><ul data-start=\"5742\" data-end=\"6038\"><li data-start=\"5742\" data-end=\"5835\"><p data-start=\"5744\" data-end=\"5835\">Use thin paper on PTFE trace side and clamp with FR-4 or phenolic backing during routing.<\/p><\/li><li data-start=\"5836\" data-end=\"6038\"><p data-start=\"5838\" data-end=\"6038\">After routing, hand-finish edge burrs and inspect carefully. Avoid damaging copper and board surface. Use sulfur-free separation paper. Reduce burrs well. The routing step must leave good edge finish.<\/p><\/li><\/ul><hr data-start=\"6040\" data-end=\"6043\" \/><h1 data-start=\"6045\" data-end=\"6093\">Production Flow for High-Frequency PTFE Boards<\/h1><p data-start=\"6095\" data-end=\"6167\">Below are three common process flows. I put them in a table for clarity.<\/p><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"6169\" data-end=\"6917\"><thead data-start=\"6169\" data-end=\"6207\"><tr data-start=\"6169\" data-end=\"6207\"><th data-start=\"6169\" data-end=\"6184\" data-col-size=\"sm\">Process Type<\/th><th data-start=\"6184\" data-end=\"6207\" data-col-size=\"xl\">Key Steps (summary)<\/th><\/tr><\/thead><tbody data-start=\"6218\" data-end=\"6917\"><tr data-start=\"6218\" data-end=\"6482\"><td data-start=\"6218\" data-end=\"6260\" data-col-size=\"sm\">NPTH (Non-Plated Through Hole) for PTFE<\/td><td data-col-size=\"xl\" data-start=\"6260\" data-end=\"6482\">Cutting \u2192 Drilling \u2192 Dry film \u2192 Inspection \u2192 Etch \u2192 Etch inspection \u2192 Solder mask \u2192 Dry film exposure \u2192 Hot air solder leveling (HASL) or tin spray \u2192 Routing\/shaping \u2192 Inspection \u2192 Final inspection \u2192 Packing \u2192 Delivery<\/td><\/tr><tr data-start=\"6483\" data-end=\"6822\"><td data-start=\"6483\" data-end=\"6520\" data-col-size=\"sm\">PTH (Plated Through Hole) for PTFE<\/td><td data-col-size=\"xl\" data-start=\"6520\" data-end=\"6822\">Cutting \u2192 Drilling \u2192 Hole treatment (low-temp plasma or sodium naphthalene activation) \u2192 Copper plating \u2192 Panel electrical test \u2192 Dry film \u2192 Inspection \u2192 Imaging \u2192 Etch \u2192 Etch inspection \u2192 Solder mask \u2192 Dry film exposure \u2192 HASL \u2192 Routing\/shaping \u2192 Inspection \u2192 Final inspection \u2192 Packing \u2192 Delivery<\/td><\/tr><tr data-start=\"6823\" data-end=\"6917\"><td data-start=\"6823\" data-end=\"6854\" data-col-size=\"sm\">Solder mask process controls<\/td><td data-col-size=\"xl\" data-start=\"6854\" data-end=\"6917\">Control green mask adhesion and bubble formation carefully.<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"6919\" data-end=\"6999\">Note: Each process step must control surface scratch and other defects strictly.<\/p><hr data-start=\"7001\" data-end=\"7004\" \/><h1 data-start=\"7006\" data-end=\"7043\">Applications of High-Frequency PCBs<\/h1><p data-start=\"7045\" data-end=\"7084\">High-frequency PCBs commonly appear in:<\/p><ul data-start=\"7086\" data-end=\"7468\"><li data-start=\"7086\" data-end=\"7137\"><p data-start=\"7088\" data-end=\"7137\">Power amplifiers and low noise amplifiers (LNA)<\/p><\/li><li data-start=\"7138\" data-end=\"7198\"><p data-start=\"7140\" data-end=\"7198\">Mobile communication products and smart lighting systems<\/p><\/li><li data-start=\"7199\" data-end=\"7273\"><p data-start=\"7201\" data-end=\"7273\">Power dividers, couplers, duplexers, filters and other passive devices<\/p><\/li><li data-start=\"7274\" data-end=\"7366\"><p data-start=\"7276\" data-end=\"7366\">Automotive collision avoidance systems, communication satellites, wireless phone systems<\/p><\/li><li data-start=\"7367\" data-end=\"7468\"><p data-start=\"7369\" data-end=\"7468\">In short, electronics are moving to higher frequencies and high-frequency boards follow this trend.<\/p><\/li><\/ul><hr data-start=\"7470\" data-end=\"7473\" \/><h1 data-start=\"7475\" data-end=\"7510\">How to Design High-Frequency PCBs<\/h1><p data-start=\"7512\" data-end=\"7840\">In high-frequency PCB design, power plane layout is critical. Usually put power on its own layer. This helps the circuit follow the path of least impedance. Power plane must provide return paths for all signals on the PCB. That lowers loop area and reduces noise. Low-frequency designers often ignore some of these noise issues.<\/p><p data-start=\"7842\" data-end=\"7890\">Follow these rules in high-frequency PCB design:<\/p><ul data-start=\"7892\" data-end=\"8086\"><li data-start=\"7892\" data-end=\"7937\"><p data-start=\"7894\" data-end=\"7937\">Keep power and ground stable and unified.<\/p><\/li><li data-start=\"7938\" data-end=\"8001\"><p data-start=\"7940\" data-end=\"8001\">Careful routing and correct termination remove reflections.<\/p><\/li><li data-start=\"8002\" data-end=\"8086\"><p data-start=\"8004\" data-end=\"8086\">Careful routing and correct termination reduce capacitance and measured crosstalk.<\/p><\/li><\/ul><p data-start=\"8088\" data-end=\"8124\">Below I expand several key subjects.<\/p><h2 data-start=\"8126\" data-end=\"8156\">(1) Transmission line width<\/h2><p data-start=\"8158\" data-end=\"8249\">Transmission line width in high-frequency PCB design must follow impedance matching theory.<\/p><p data-start=\"8251\" data-end=\"8701\"><strong data-start=\"8251\" data-end=\"8273\">Impedance matching<\/strong><br data-start=\"8273\" data-end=\"8276\" \/>When input\/output impedance and transmission line impedance match, the system gives maximum output power and minimum reflection. For microwave circuits, matching must also consider device bias points. Vias on signal lines change transmission properties. For TTL and CMOS, characteristic impedance is high, so the effect is small. But for 50 \u03a9 low-impedance RF lines, vias must be considered. Usually avoid vias on such lines.<\/p><h2 data-start=\"8703\" data-end=\"8755\">(2) Crosstalk between parallel transmission lines<\/h2><p data-start=\"8757\" data-end=\"9122\">When two microstrip lines run close and parallel, coupling occurs. They cause crosstalk and change line characteristic impedance. Pay attention for 50 \u03a9 and 75 \u03a9 circuits. Designers can use coupling for some functions, such as directional couplers or power measurement. Example values from one design (1.97 GHz PCS end base station amplifier, dielectric \u03b5r = 3.48):<\/p><ul data-start=\"9124\" data-end=\"9266\"><li data-start=\"9124\" data-end=\"9195\"><p data-start=\"9126\" data-end=\"9195\">For a 10 dB directional coupler: S = 5 mil, l = 920 mil, W = 53 mil<\/p><\/li><li data-start=\"9196\" data-end=\"9266\"><p data-start=\"9198\" data-end=\"9266\">For a 20 dB directional coupler: S = 35 mil, l = 920 mil, W = 62 mil<\/p><\/li><\/ul><p data-start=\"9268\" data-end=\"9308\">To reduce crosstalk, follow these rules:<\/p><p data-start=\"9310\" data-end=\"9556\">A. Keep spacing S between high-frequency or high-speed parallel lines at least one line width.<br data-start=\"9404\" data-end=\"9407\" \/>B. Cut down parallel length where possible.<br data-start=\"9450\" data-end=\"9453\" \/>C. Keep tiny high-frequency signals away from power and logic lines that can cause strong interference.<\/p><h2 data-start=\"9558\" data-end=\"9600\">(3) Ground via electromagnetic analysis<\/h2><p data-start=\"9602\" data-end=\"10021\">For IC ground pins or other ground pins, put ground vias close to pins in high-frequency circuits. The idea: a short ground path acts like an inductive impedance. Ground via also looks inductive. This affects filter function. That is why place ground vias close to pins. To reduce inductive load, use more ground vias than in low-frequency boards. This raises ground current capacity and helps keep all points near 0 V.<\/p><h2 data-start=\"10023\" data-end=\"10045\">(4) Power filtering<\/h2><p data-start=\"10047\" data-end=\"10529\">For TTL and CMOS, designers add bypass capacitors near power pins to reduce logic noise. For high-frequency and microwave circuits, this is not enough. High-frequency signals make high-frequency interference on power. Use series inductors and capacitors. Choose inductors by working frequency. Example: to filter &gt;1 MHz noise with C = 0.1 \u03bcF, pick L = 1 \u03bcH. When adding inductance on collector open-circuit signal pins, be careful. The inductor acts like a matching inductance then.<\/p><h2 data-start=\"10531\" data-end=\"10547\">(5) Shielding<\/h2><p data-start=\"10549\" data-end=\"10680\">Use shielding to protect small or high-frequency signals. This reduces strong signal interference and reduces EMI. Some guidelines:<\/p><p data-start=\"10682\" data-end=\"10902\">A. In low frequency digital\/analog (&lt;30 MHz) small-signal designs, split digital and analog grounds, and pour ground plane in small-signal zones. Keep distance between ground pour and traces greater than the trace width.<\/p><p data-start=\"10904\" data-end=\"11021\">B. In high-frequency digital\/analog small-signal design, add shielding cans or stitched ground vias to isolate areas.<\/p><p data-start=\"10904\" data-end=\"11021\"><img class=\"alignnone size-full wp-image-2729\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Isola-PCB.webp\" alt=\"Isola-PCB\" width=\"600\" height=\"449\" \/><\/p><p data-start=\"11023\" data-end=\"11245\">C. For high-power high-frequency circuits, make the high-frequency part a separate functional module and add a metal shield box to lower radiation. For example, optical fiber transceiver modules at 155 M, 622 M, or 2 Gb\/s.<\/p><p data-start=\"11247\" data-end=\"11435\">A multi-layer PCB for mobile phone (example: Nokia 6110) may place components on both sides and use internal ground pours as shown in the original figure. (Figure references omitted here.)<\/p><hr data-start=\"11437\" data-end=\"11440\" \/><h1 data-start=\"11442\" data-end=\"11490\">Examples of Material Selection for High Boards<\/h1><p data-start=\"11492\" data-end=\"11548\">Below are examples from boards we designed and debugged:<\/p><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"11550\" data-end=\"12491\"><thead data-start=\"11550\" data-end=\"11608\"><tr data-start=\"11550\" data-end=\"11608\"><th data-start=\"11550\" data-end=\"11580\" data-col-size=\"sm\">Application (freq \/ device)<\/th><th data-start=\"11580\" data-end=\"11599\" data-col-size=\"md\">Material \/ Stack<\/th><th data-start=\"11599\" data-end=\"11608\" data-col-size=\"md\">Notes<\/th><\/tr><\/thead><tbody data-start=\"11624\" data-end=\"12491\"><tr data-start=\"11624\" data-end=\"11797\"><td data-start=\"11624\" data-end=\"11656\" data-col-size=\"sm\">2.4 GHz spread spectrum relay<\/td><td data-col-size=\"md\" data-start=\"11656\" data-end=\"11700\">FR-4, 4-layer PCB with large ground pours<\/td><td data-col-size=\"md\" data-start=\"11700\" data-end=\"11797\">High-frequency analog part separated. Power lines use inductors to isolate from digital part.<\/td><\/tr><tr data-start=\"11798\" data-end=\"11939\"><td data-start=\"11798\" data-end=\"11823\" data-col-size=\"sm\">2.4 GHz RF transceiver<\/td><td data-col-size=\"md\" data-start=\"11823\" data-end=\"11859\">PTFE material, double-sided board<\/td><td data-col-size=\"md\" data-start=\"11859\" data-end=\"11939\">RF transmit and receive in separate metal shield cans; power input filtered.<\/td><\/tr><tr data-start=\"11940\" data-end=\"12035\"><td data-start=\"11940\" data-end=\"11965\" data-col-size=\"sm\">1.9 GHz RF transceiver<\/td><td data-col-size=\"md\" data-start=\"11965\" data-end=\"11994\">PTFE material, 4-layer PCB<\/td><td data-col-size=\"md\" data-start=\"11994\" data-end=\"12035\">Use large ground pours and shielding.<\/td><\/tr><tr data-start=\"12036\" data-end=\"12123\"><td data-start=\"12036\" data-end=\"12061\" data-col-size=\"sm\">140 MHz IF transceiver<\/td><td data-col-size=\"md\" data-start=\"12061\" data-end=\"12086\">Top layer S1139 0.3 mm<\/td><td data-col-size=\"md\" data-start=\"12086\" data-end=\"12123\">Large ground pour; via isolation.<\/td><\/tr><tr data-start=\"12124\" data-end=\"12223\"><td data-start=\"12124\" data-end=\"12148\" data-col-size=\"sm\">70 MHz IF transceiver<\/td><td data-col-size=\"md\" data-start=\"12148\" data-end=\"12168\">FR-4, 4-layer PCB<\/td><td data-col-size=\"md\" data-start=\"12168\" data-end=\"12223\">Large ground pour; module isolation via via fences.<\/td><\/tr><tr data-start=\"12224\" data-end=\"12385\"><td data-start=\"12224\" data-end=\"12247\" data-col-size=\"sm\">30 W power amplifier<\/td><td data-col-size=\"md\" data-start=\"12247\" data-end=\"12283\">RO4350 material, double-sided PCB<\/td><td data-col-size=\"md\" data-start=\"12283\" data-end=\"12385\">Large ground pour; spacing controlled to &gt;= 50 \u03a9 line width; shield box and power input filtering.<\/td><\/tr><tr data-start=\"12386\" data-end=\"12491\"><td data-start=\"12386\" data-end=\"12414\" data-col-size=\"sm\">2000 MHz microwave source<\/td><td data-col-size=\"md\" data-start=\"12414\" data-end=\"12433\">S1139 0.8 mm top<\/td><td data-col-size=\"md\" data-start=\"12433\" data-end=\"12491\">Double-sided PCB; precise control of trace dimensions.<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"12493\" data-end=\"12573\">Use these as examples. Each project needs its own material and thickness choice.<\/p><hr data-start=\"12575\" data-end=\"12578\" \/><h1 data-start=\"12580\" data-end=\"12622\">High-Frequency PCB Material Requirements<\/h1><p data-start=\"12624\" data-end=\"12677\">Designers should check these key material properties:<\/p><ol data-start=\"12679\" data-end=\"13167\"><li data-start=\"12679\" data-end=\"12784\"><p data-start=\"12682\" data-end=\"12784\"><strong data-start=\"12682\" data-end=\"12720\">Dielectric loss (Df, loss tangent)<\/strong> must be very small. Small loss means less signal attenuation.<\/p><\/li><li data-start=\"12785\" data-end=\"12884\"><p data-start=\"12788\" data-end=\"12884\"><strong data-start=\"12788\" data-end=\"12812\">Low water absorption<\/strong> is important. High water uptake changes dielectric constant and loss.<\/p><\/li><li data-start=\"12885\" data-end=\"13021\"><p data-start=\"12888\" data-end=\"13021\"><strong data-start=\"12888\" data-end=\"12916\">Dielectric constant (DK)<\/strong> must be low and stable. Lower DK gives higher signal speed. DK stability also helps impedance control.<\/p><\/li><li data-start=\"13022\" data-end=\"13167\"><p data-start=\"13025\" data-end=\"13167\"><strong data-start=\"13025\" data-end=\"13050\">CTE and thermal match<\/strong> between copper foil and base must be similar. Large mismatch over temperature changes can cause copper delamination.<\/p><\/li><\/ol><p data-start=\"13169\" data-end=\"13256\">High frequency often means use of fluoropolymer substrates like PTFE (known as Teflon).<\/p><hr data-start=\"13258\" data-end=\"13261\" \/><h1 data-start=\"13263\" data-end=\"13321\">Manufacturing Notes and Cautions for High-Frequency PCBs<\/h1><ol data-start=\"13323\" data-end=\"13843\"><li data-start=\"13323\" data-end=\"13424\"><p data-start=\"13326\" data-end=\"13424\"><strong data-start=\"13326\" data-end=\"13358\">Impedance control is strict.<\/strong> Line width tolerance is tight. Typical control tolerance ~ \u00b12%.<\/p><\/li><li data-start=\"13425\" data-end=\"13580\"><p data-start=\"13428\" data-end=\"13580\"><strong data-start=\"13428\" data-end=\"13473\">PTH adhesion is low on special materials.<\/strong> Use plasma surface roughening for holes and surfaces to increase adhesion for plating and solder resist.<\/p><\/li><li data-start=\"13581\" data-end=\"13711\"><p data-start=\"13584\" data-end=\"13711\"><strong data-start=\"13584\" data-end=\"13627\">Do not sand the board before soldering.<\/strong> This reduces adhesion. Use micro-etch solutions or other roughening methods only.<\/p><\/li><li data-start=\"13712\" data-end=\"13843\"><p data-start=\"13715\" data-end=\"13843\"><strong data-start=\"13715\" data-end=\"13783\">PTFE boards often cause rough edges with standard milling tools.<\/strong> Use special milling bits and follow PTFE routing practices.<\/p><\/li><\/ol><hr data-start=\"13845\" data-end=\"13848\" \/><h1 data-start=\"13850\" data-end=\"13868\">Short Conclusion<\/h1><p data-start=\"13870\" data-end=\"14235\">High-frequency PCBs need special materials and careful process control. Choose a material that fits your frequency and thermal needs. Control impedance and place ground vias closely. Use shielding and correct power filtering. Follow special handling steps for PTFE and other microwave laminates. These steps improve performance and yield in high-frequency circuits.<\/p>","display_condition_list":[{"display_condition_login_status":"subscriber","_id":"18e069d"}]},"elements":[],"widgetType":"text-editor"}\\\"]\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<section class=\\\"elementor-section elementor-top-section elementor-element elementor-element-brlk2x4 elementor-section-content-top elementor-section-boxed elementor-section-height-default elementor-section-height-default\\\" data-id=\\\"brlk2x4\\\" data-element_type=\\\"section\\\" data-settings=\\\"{&quot;background_background&quot;:&quot;classic&quot;}\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-background-overlay\\\"><\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-container elementor-column-gap-no\\\">\\n\\t\\t\\t\\t\\t<div class=\\\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7882748\\\" data-id=\\\"7882748\\\" data-element_type=\\\"column\\\">\\n\\t\\t\\t<div class=\\\"elementor-widget-wrap elementor-element-populated\\\">\\n\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-element elementor-element-9fc6712 elementor-widget elementor-widget-heading\\\" data-id=\\\"9fc6712\\\" data-element_type=\\\"widget\\\" data-widget_type=\\\"heading.default\\\">\\n\\t\\t\\t\\t<div class=\\\"elementor-widget-container\\\">\\n\\t\\t\\t\\t\\t<h2 class=\\\"elementor-heading-title elementor-size-default\\\">Frequently Asked Questions<\\\/h2>\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<div class=\\\"elementor-element elementor-element-631b990 elementor-widget elementor-widget-accordion\\\" data-id=\\\"631b990\\\" data-element_type=\\\"widget\\\" data-widget_type=\\\"accordion.default\\\">\\n\\t\\t\\t\\t<div class=\\\"elementor-widget-container\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1031\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"1\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1031\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">Which substrate materials are commonly used for high-frequency PCBs?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1031\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"1\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1031\\\"><p>Typical materials include PTFE (Teflon)-based laminates and engineered composites from suppliers like Rogers (RO3000\\\/RO4000\\\/RT\\\/duroid) and Isola, chosen for low loss tangent and stable dielectric constant.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1032\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"2\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1032\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">Why not just use FR-4 for RF\\\/high-frequency designs?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1032\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"2\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1032\\\"><p>FR-4 has higher dielectric loss and less stable dielectric constant at GHz frequencies, which increases signal loss and impedance variability; for many RF or microwave applications, PTFE\\\/Rogers-class laminates perform much better.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1033\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"3\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1033\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">What electrical properties matter most (Dk, loss tangent)?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1033\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"3\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1033\\\"><p>Dielectric constant (Dk) controls impedance and signal velocity; loss tangent (Df) governs signal attenuation. Low, stable Dk and low loss tangent are essential for consistent high-frequency performance.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1034\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"4\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1034\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">Typical applications for high-frequency PCBs?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1034\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"4\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1034\\\"><p>Antennas, RF amplifiers, filters, 5G base stations, microwave radio links, satellite communications, radar, and high-speed RF modules.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1035\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"5\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1035\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">How do I choose the right high-frequency laminate?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1035\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"5\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1035\\\"><p>Match required frequency range, target impedance stability, thermal\\\/CTE needs, and loss tangent. Review supplier datasheets (Rogers, Isola, etc.) and request material test data (Dk\\\/Df vs frequency).<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/section>\\n\\t\\t\",\"scripts\":[],\"styles\":[]}}"],"_uag_css_file_name":["uag-css-1909.css"],"_uag_js_file_name":["uag-js-1909.js"]},"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"Philifast","author_link":"https:\/\/flj-pcb.com\/fi\/author\/2475017442jygmail-com\/"},"uagb_comment_info":0,"uagb_excerpt":"What Is a High-Frequency PCB A high-frequency PCB is a special printed circuit board (PCB) used for high electromagnetic frequency [&hellip;]","_links":{"self":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/pages\/1909","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/comments?post=1909"}],"version-history":[{"count":18,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/pages\/1909\/revisions"}],"predecessor-version":[{"id":3345,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/pages\/1909\/revisions\/3345"}],"up":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/pages\/1898"}],"wp:attachment":[{"href":"https:\/\/flj-pcb.com\/fi\/wp-json\/wp\/v2\/media?parent=1909"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}