{"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\/bs\/pcb-manufacturer\/high-frequency-pcb\/","title":{"rendered":"Visokofrekventna \u0161tampana plo\u010dica: niski gubici, velika brzina"},"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\" data-e-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-e-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\">\u0160ta je visokofrekventna \u0161tampana plo\u010dica?<\/h2><p data-start=\"347\" data-end=\"753\">Jedan<a href=\"https:\/\/en.wikipedia.org\/wiki\/Printed_circuit_board#High_frequency_PCBs\" target=\"_blank\" rel=\"noopener\"> visokofrekventna tiskanica<\/a> je posebna \u0161tampana plo\u010dica (PCB) koja se koristi za signale visokih elektromagnetnih frekvencija. Ove plo\u010dice su namijenjene radiofrekvencijama iznad otprilike 300 MHz (valna du\u017eina &lt; 1 m) i mikrotalasnim frekvencijama iznad otprilike 3 GHz (valna du\u017eina &lt; 0,1 m). Izra\u0111uju se na mikrotalasnim baznim laminatima oblo\u017eenim bakrom. Proizvodnja mo\u017ee koristiti neke standardne korake za \u010dvrste PCB-ove ili primjenjivati posebne metode za ove materijale.<\/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\">Sa brzim napretkom tehnologije, sve vi\u0161e ure\u0111aja radi u mikrotalasnom opsegu (&gt;1 GHz), pa \u010dak i u milimetarskim opsezima (&gt;30 GHz). To zna\u010di da frekvencije rastu i da potrebe za materijalima rastu. Osnovni materijali moraju imati vrlo dobra elektri\u010dna svojstva i dobru hemijsku stabilnost. Kako frekvencija signala raste, gubici u materijalu moraju ostati vrlo niski. Sa dolaskom 5G-a, visokofrekventni materijali postali su va\u017eniji.<\/p><hr data-start=\"1167\" data-end=\"1170\" \/><h1 data-start=\"1172\" data-end=\"1207\">Prednosti visokofrekventnih tiskanih plo\u010dica<\/h1><p data-start=\"1209\" data-end=\"1430\"><strong data-start=\"1209\" data-end=\"1231\">1. Visoka efikasnost<\/strong><br data-start=\"1231\" data-end=\"1234\" \/>Materijali s niskom dielektri\u010dnom konstantom uzrokuju male gubitke. Moderno induktivno zagrijavanje i druge metode mogu posti\u0107i ciljeve i odr\u017eati visoku efikasnost. Ove plo\u010de tako\u0111er poma\u017eu u smanjenju otpada i odgovaraju ekolo\u0161kim ciljevima.<\/p><p data-start=\"1432\" data-end=\"1677\"><strong data-start=\"1432\" data-end=\"1449\">2. Visoka brzina<\/strong><br data-start=\"1449\" data-end=\"1452\" \/>Brzina signala je obrnuto proporcionalna kvadratnom korijenu dielektri\u010dne konstante. Ni\u017ea dielektri\u010dna konstanta zna\u010di br\u017ei prijenos. Posebni materijali odr\u017eavaju dielektri\u010dnu konstantu niskom i stabilnom. To poma\u017ee prijenosu signala.<\/p><p data-start=\"1679\" data-end=\"1970\"><strong data-start=\"1679\" data-end=\"1723\">3. Dobra kontrola grijanja ili obrade<\/strong><br data-start=\"1723\" data-end=\"1726\" \/>Visokofrekventne plo\u010de koriste se u mnogim oblastima koje zahtijevaju precizno zagrijavanje metalnih dijelova. Mo\u017eete kontrolisati koliko duboko ili gdje \u0107ete zagrijavati. Mo\u017eete se fokusirati na povr\u0161insko ili dubinsko zagrijavanje. Mo\u017eete zagrijavati na fokusiran ili raspr\u0161en na\u010din. Plo\u010da omogu\u0107ava preciznu kontrolu.<\/p><p data-start=\"1972\" data-end=\"2316\"><strong data-start=\"1972\" data-end=\"1996\">4. Izdr\u017eljivost<\/strong><br data-start=\"1996\" data-end=\"1999\" \/>Dielektri\u010dna konstanta i dielektri\u010dni materijal ovise o okoli\u0161u. U vla\u017enim podru\u010djima vlaga o\u0161te\u0107uje plo\u010de. Visokofrekventne plo\u010de izra\u0111ene od materijala s niskom apsorpcijom vode to podnose. Otporne su na kemijsku koroziju, vlagu i visoke temperature te imaju visoku \u010dvrsto\u0107u lju\u0161tenja. Ove osobine ih \u010dine izdr\u017eljivima u te\u0161kim uvjetima.<\/p><hr data-start=\"2318\" data-end=\"2321\" \/><h1 data-start=\"2323\" data-end=\"2375\">Uobi\u010dajeni materijali za PCB-ove za visoke frekvencije i visoke brzine<\/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\">Marka \/ Proizvo\u0111a\u010d<\/th><th data-start=\"2393\" data-end=\"2419\" data-col-size=\"md\">Tipi\u010dne serije \/ vrste<\/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 ili brend TUC)<\/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\">Otok<\/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\">Doma\u0107i proizvo\u0111a\u010di (Kina)<\/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\">(Koristite ove primjere materijala kao polaznu osnovu. Svaki dizajn zahtijeva pravi izbor materijala za frekvenciju i raspored.)<\/p><hr data-start=\"2851\" data-end=\"2854\" \/><h1 data-start=\"2856\" data-end=\"2913\">Razlika izme\u0111u visokofrekventnih plo\u010da i HDI plo\u010da<\/h1><p data-start=\"2915\" data-end=\"3218\">Visokofrekventne tiskane plo\u010de namijenjene su radaru, testnim instrumentima, automobilskim sustavima za izbjegavanje sudara, komunikacijskim satelitima, be\u017ei\u010dnim sustavima i drugim podru\u010djima. HDI (High Density Interconnect) plo\u010de namijenjene su malim ure\u0111ajima s mnogo komponenti. HDI \u010desto koristi dvostrane plo\u010de u proizvodima malog obujma.<\/p><p data-start=\"3220\" data-end=\"3555\">Visokofrekventna plo\u010da zahtijeva vrlo visoku kontrolu procesa i preciznost. Dizajneri \u010desto po\u010dinju s FR-4 stakloepoksidom, ali prave visokofrekventne plo\u010de koriste posebne laminate. Plo\u010da mora imati malu i stabilnu dielektri\u010dnu konstantu, niske dielektri\u010dne gubitke, nisku apsorpciju vode, visoku temperaturnu toleranciju i dobru otpornost na koroziju.<\/p><p data-start=\"3557\" data-end=\"3824\">HDI plo\u010da koristi mikro slijepe vias-ove kako bi postigla visoku gusto\u0107u rute. Ima unutra\u0161nje i vanjske rute koje se povezuju bu\u0161enjem i presvla\u010denjem. HDI je namijenjen kompaktnim proizvodima. Neki HDI dizajni koriste modularne paralelne module i sna\u017enu DSP kontrolu za karakteristike napajanja i optere\u0107enja.<\/p><hr data-start=\"3826\" data-end=\"3829\" \/><h1 data-start=\"3831\" data-end=\"3880\">Tipovi \/ klasifikacija visokofrekventnih plo\u010da<\/h1><p data-start=\"3882\" data-end=\"3938\">U nastavku su uobi\u010dajene vrste i napomene o njihovoj obradi:<\/p><p data-start=\"3940\" data-end=\"3989\"><strong data-start=\"3940\" data-end=\"3987\">1. Termorezina punjena prahom (kerami\u010dki punjena)<\/strong><\/p><ul data-start=\"3990\" data-end=\"4260\"><li data-start=\"3990\" data-end=\"4078\"><p data-start=\"3992\" data-end=\"4078\">Materijali i dobavlja\u010di: Rogers 4350B \/ 4003C; Arlon 25N \/ 25FR; Taconic TLG serija.<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\">Obrada: Koraci su sli\u010dni FR-4 epoksidnim staklenim laminatima. Me\u0111utim, plo\u010de su krhke i lako se lome. Vijek trajanja bu\u0161ilica i nastavaka za glodalicu smanjuje se za otprilike 20%. Rukujte s oprezom.<\/p><\/li><\/ul><p data-start=\"4262\" data-end=\"4309\"><strong data-start=\"4262\" data-end=\"4307\">2. PTFE (politetraflouroetilen, Teflon)<\/strong><\/p><ul data-start=\"4310\" data-end=\"5232\"><li data-start=\"4310\" data-end=\"4539\"><p data-start=\"4312\" data-end=\"4338\">Materijali i dobavlja\u010di:<\/p><ul data-start=\"4341\" data-end=\"4539\"><li data-start=\"4341\" data-end=\"4389\"><p data-start=\"4343\" data-end=\"4389\">Rogers: serija RO3000, serija RT, serija TMM<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: serije AD\/AR, IsoClad, serije CuClad<\/p><\/li><li data-start=\"4442\" data-end=\"4488\"><p data-start=\"4444\" data-end=\"4488\">Taconic: RF serija, TLX serija, TLY serija<\/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\">Napomene za obradu PTFE-a:<\/p><ul data-start=\"4573\" data-end=\"5232\"><li data-start=\"4573\" data-end=\"4657\"><p data-start=\"4575\" data-end=\"4657\">Prilikom rezanja neza\u0161ti\u0107enih listova dr\u017eite za\u0161titnu foliju kako biste izbjegli ogrebotine i tragove pre\u0161anja.<\/p><\/li><li data-start=\"4660\" data-end=\"4791\"><p data-start=\"4662\" data-end=\"4791\">Koristite nove bu\u0161ilice (preporu\u010duju se standardne bu\u0161ilice #130). Za najbolje rezultate bu\u0161ite jednu plo\u010du odjednom. Odr\u017eavajte pritisak stezaljke na ~40 psi.<\/p><\/li><li data-start=\"4794\" data-end=\"4872\"><p data-start=\"4796\" data-end=\"4872\">Koristite aluminijsku potporu i melaminske podlo\u0161ke debljine 1 mm za dr\u017eanje PTFE-a tokom bu\u0161enja.<\/p><\/li><li data-start=\"4875\" data-end=\"4931\"><p data-start=\"4877\" data-end=\"4931\">Nakon bu\u0161enja, izduvajte pra\u0161inu iz rupa toplim zrakom.<\/p><\/li><li data-start=\"4934\" data-end=\"5044\"><p data-start=\"4936\" data-end=\"5044\">Koristite stabilnu bu\u0161ilicu. Za male rupe pove\u0107ajte brzinu i smanjite optere\u0107enje strugotine i brzinu povratka vretena.<\/p><\/li><li data-start=\"5047\" data-end=\"5155\"><p data-start=\"5049\" data-end=\"5155\">Tretman povr\u0161ine otvora: niska-temperaturna plazma ili aktivacija natrijevim naftalensulfonatom poma\u017eu metalizaciji otvora.<\/p><\/li><li data-start=\"5158\" data-end=\"5232\"><p data-start=\"5160\" data-end=\"5232\">PTH (plated through hole) talo\u017eenje bakra i njegovo prianjanje zahtijevaju pa\u017enju.<\/p><\/li><\/ul><\/li><\/ul><p data-start=\"5234\" data-end=\"5264\"><strong data-start=\"5234\" data-end=\"5262\">3. Depozicija bakra PTH<\/strong><\/p><ul data-start=\"5265\" data-end=\"5384\"><li data-start=\"5265\" data-end=\"5384\"><p data-start=\"5267\" data-end=\"5384\">Nakon mikro-graviranja (kontrola od ~20 mikroin\u010da), izvr\u0161ite PTH. Ako je potrebno, izvr\u0161ite drugi prolaz PTH prema zahtjevima rute na plo\u010di.<\/p><\/li><\/ul><p data-start=\"5386\" data-end=\"5427\"><strong data-start=\"5386\" data-end=\"5425\">4. Proces maske za lemljenje (zelena maska)<\/strong><\/p><ul data-start=\"5428\" data-end=\"5701\"><li data-start=\"5428\" data-end=\"5498\"><p data-start=\"5430\" data-end=\"5498\">Priprema: koristiti kiselinsko\/alkalno \u010di\u0161\u0107enje; izbjegavati mehani\u010dko bru\u0161enje.<\/p><\/li><li data-start=\"5499\" data-end=\"5574\"><p data-start=\"5501\" data-end=\"5574\">Nakon predtretmana, ispecite plo\u010du (90 \u00b0C, 30 min) i nanesite suhi film.<\/p><\/li><li data-start=\"5575\" data-end=\"5701\"><p data-start=\"5577\" data-end=\"5701\">Pecite u tri faze: 80 \u00b0C, 100 \u00b0C, 150 \u00b0C, po 30 minuta. Ako maska poka\u017ee masne mrlje, uklonite masku i ponovite postupak aktivacije.<\/p><\/li><\/ul><p data-start=\"5703\" data-end=\"5741\"><strong data-start=\"5703\" data-end=\"5739\">5. Ruterisanje PTFE plo\u010da<\/strong><\/p><ul data-start=\"5742\" data-end=\"6038\"><li data-start=\"5742\" data-end=\"5835\"><p data-start=\"5744\" data-end=\"5835\">Koristite tanak papir na strani PTFE traga i stegnite ga FR-4 ili fenolnom podlogom tokom provla\u010denja.<\/p><\/li><li data-start=\"5836\" data-end=\"6038\"><p data-start=\"5838\" data-end=\"6038\">Nakon routanja, ru\u010dno doradite i uklonite hrapavosti na ivicama i pa\u017eljivo pregledajte. Izbjegavajte o\u0161te\u0107enje bakra i povr\u0161ine plo\u010de. Koristite odvojni papir bez sumpora. Dobro smanjite hrapavosti. Korak routanja mora ostaviti dobru zavr\u0161nu obradu ivica.<\/p><\/li><\/ul><hr data-start=\"6040\" data-end=\"6043\" \/><h1 data-start=\"6045\" data-end=\"6093\">Proces proizvodnje visokofrekventnih PTFE plo\u010da<\/h1><p data-start=\"6095\" data-end=\"6167\">Ispod su tri uobi\u010dajena toka procesa. Stavila sam ih u tabelu radi jasno\u0107e.<\/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\">Tip procesa<\/th><th data-start=\"6184\" data-end=\"6207\" data-col-size=\"xl\">Klju\u010dni koraci (sa\u017eetak)<\/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 (neoblo\u017eena provrtana rupa) za PTFE<\/td><td data-col-size=\"xl\" data-start=\"6260\" data-end=\"6482\">Rezanje \u2192 Bu\u0161enje \u2192 Suha folija \u2192 Inspekcija \u2192 Graviranje \u2192 Inspekcija graviranja \u2192 Maska za lemljenje \u2192 Izlaganje suhe folije \u2192 Ravnanje lemom toplim zrakom (HASL) ili prskanje kalaja \u2192 Fr\u00e9ziranje\/oblikovanje \u2192 Inspekcija \u2192 Zavr\u0161na inspekcija \u2192 Pakovanje \u2192 Dostava<\/td><\/tr><tr data-start=\"6483\" data-end=\"6822\"><td data-start=\"6483\" data-end=\"6520\" data-col-size=\"sm\">PTH (Plated Through Hole) za PTFE<\/td><td data-col-size=\"xl\" data-start=\"6520\" data-end=\"6822\">Rezanje \u2192 Bu\u0161enje \u2192 Obrada rupe (plazma niske temperature ili aktivacija natrijevim naftalenom) \u2192 Mjedna pozlatna obrada \u2192 Elektri\u010dno ispitivanje plo\u010de \u2192 Suha folija \u2192 Inspekcija \u2192 Oznaka \u2192 Gravirovanje \u2192 Inspekcija gravirovanja \u2192 Maska za lemljenje \u2192 Izlaganje suhe folije \u2192 HASL \u2192 Fr\u00e9ziranje\/oblikovanje \u2192 Inspekcija \u2192 Zavr\u0161na inspekcija \u2192 Pakovanje \u2192 Dostava<\/td><\/tr><tr data-start=\"6823\" data-end=\"6917\"><td data-start=\"6823\" data-end=\"6854\" data-col-size=\"sm\">Kontrole procesa maske za lemljenje<\/td><td data-col-size=\"xl\" data-start=\"6854\" data-end=\"6917\">Pa\u017eljivo kontrolirajte prianjanje zelene maske i stvaranje mjehuri\u0107a.<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"6919\" data-end=\"6999\">Napomena: Svaki korak procesa mora strogo kontrolisati ogrebotine na povr\u0161ini i druge nedostatke.<\/p><hr data-start=\"7001\" data-end=\"7004\" \/><h1 data-start=\"7006\" data-end=\"7043\">Primjene visokofrekventnih tiskanih plo\u010dica<\/h1><p data-start=\"7045\" data-end=\"7084\">Visokofrekventne tiskane plo\u010de se obi\u010dno pojavljuju u:<\/p><ul data-start=\"7086\" data-end=\"7468\"><li data-start=\"7086\" data-end=\"7137\"><p data-start=\"7088\" data-end=\"7137\">Poja\u010dala snage i poja\u010dala s niskom bukom (LNA)<\/p><\/li><li data-start=\"7138\" data-end=\"7198\"><p data-start=\"7140\" data-end=\"7198\">Proizvodi za mobilnu komunikaciju i pametni sistemi rasvjete<\/p><\/li><li data-start=\"7199\" data-end=\"7273\"><p data-start=\"7201\" data-end=\"7273\">Raspodjela\u010di snage, spojnici, duplexeri, filtri i drugi pasivni ure\u0111aji<\/p><\/li><li data-start=\"7274\" data-end=\"7366\"><p data-start=\"7276\" data-end=\"7366\">Sistemi za izbjegavanje sudara u automobilima, komunikacijski sateliti, be\u017ei\u010dni telefonski sistemi<\/p><\/li><li data-start=\"7367\" data-end=\"7468\"><p data-start=\"7369\" data-end=\"7468\">Ukratko, elektronika prelazi na vi\u0161e frekvencije, a visokofrekventne plo\u010de prate taj trend.<\/p><\/li><\/ul><hr data-start=\"7470\" data-end=\"7473\" \/><h1 data-start=\"7475\" data-end=\"7510\">Kako dizajnirati visokofrekventne \u0161tampane plo\u010dice<\/h1><p data-start=\"7512\" data-end=\"7840\">U dizajnu visokofrekventnih tiskanih plo\u010dica raspored napojne ravnine je klju\u010dan. Obi\u010dno se napajanje postavlja na vlastiti sloj. To poma\u017ee krugu da prati put najmanje impedancije. Napojna ravnina mora osigurati povratne puteve za sve signale na tiskanoj plo\u010dici. To smanjuje povr\u0161inu petlje i smanjuje \u0161um. Dizajneri niskih frekvencija \u010desto zanemaruju neke od ovih problema sa \u0161umom.<\/p><p data-start=\"7842\" data-end=\"7890\">Slijedite ova pravila pri dizajniranju visokofrekventnih PCB-ova:<\/p><ul data-start=\"7892\" data-end=\"8086\"><li data-start=\"7892\" data-end=\"7937\"><p data-start=\"7894\" data-end=\"7937\">Odr\u017eavajte napajanje i masu stabilnim i ujedna\u010denim.<\/p><\/li><li data-start=\"7938\" data-end=\"8001\"><p data-start=\"7940\" data-end=\"8001\">Pa\u017eljivo usmjeravanje i ispravno zavr\u0161avanje uklanjaju odraze.<\/p><\/li><li data-start=\"8002\" data-end=\"8086\"><p data-start=\"8004\" data-end=\"8086\">Pa\u017eljivo usmjeravanje i ispravno zavr\u0161avanje smanjuju kapacitivnost i izmjereni preslu\u0161aj.<\/p><\/li><\/ul><p data-start=\"8088\" data-end=\"8124\">Ispod pro\u0161irujem nekoliko klju\u010dnih tema.<\/p><h2 data-start=\"8126\" data-end=\"8156\">(1) \u0160irina prenosne linije<\/h2><p data-start=\"8158\" data-end=\"8249\">\u0160irina vodova u visokofrekventnom dizajnu tiskanih plo\u010dica mora slijediti teoriju uskla\u0111ivanja impedanse.<\/p><p data-start=\"8251\" data-end=\"8701\"><strong data-start=\"8251\" data-end=\"8273\">Prilago\u0111avanje impedanse<\/strong><br data-start=\"8273\" data-end=\"8276\" \/>Kada se impedansa ulaza\/izlaza i impedansa talasnog vodova podudaraju, sistem daje maksimalnu izlaznu snagu i minimalan odraz. Za mikrotalasne sklopove uskla\u0111ivanje mora tako\u0111er uzeti u obzir ta\u010dke polarnosti ure\u0111aja. Probojni otvori na signalnim vodovima mijenjaju njihova svojstva prijenosa. Za TTL i CMOS karakteristi\u010dna impedansa je visoka, pa je utjecaj mali. Ali kod RF vodova niske impedanse od 50 \u03a9 probojni otvori moraju se uzeti u obzir. Obi\u010dno se izbjegavaju probojni otvori na takvim vodovima.<\/p><h2 data-start=\"8703\" data-end=\"8755\">(2) Kros-talk izme\u0111u paralelnih prenosnih linija<\/h2><p data-start=\"8757\" data-end=\"9122\">Kada se dvije mikrostrip linije nalaze blizu i paralelno, dolazi do kupiranja. To uzrokuje preslu\u0161avanje i mijenja karakteristi\u010dnu impedanciju linije. Obratite pa\u017enju na 50 \u03a9 i 75 \u03a9 krugove. Projektanti mogu koristiti kupiranje za neke funkcije, kao \u0161to su smjerni\u010dni kupiri ili mjerenje snage. Primjeri vrijednosti iz jednog dizajna (1,97 GHz PCS krajnja bazna stanica poja\u010dalo, dielektri\u010dni \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\">Za 10 dB smjernog spojnika: 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\">Za 20 dB smjernog koplera: S = 35 mil, l = 920 mil, W = 62 mil<\/p><\/li><\/ul><p data-start=\"9268\" data-end=\"9308\">Da biste smanjili preslu\u0161avanje, slijedite ova pravila:<\/p><p data-start=\"9310\" data-end=\"9556\">A. Odr\u017eavajte razmak S izme\u0111u visokofrekventnih ili visokobrzinskih paralelnih linija najmanje jednu \u0161irinu linije.<br data-start=\"9404\" data-end=\"9407\" \/>B. Smanjite paralelnu du\u017einu gdje je to mogu\u0107e.<br data-start=\"9450\" data-end=\"9453\" \/>C. Dr\u017eite male visokofrekventne signale podalje od napojnih i logi\u010dkih linija koje mogu uzrokovati sna\u017ene smetnje.<\/p><h2 data-start=\"9558\" data-end=\"9600\">(3) Uzemljenje putem elektromagnetske analize<\/h2><p data-start=\"9602\" data-end=\"10021\">Za pinove zemlje integrisanih kola ili druge pinove zemlje, postavite zemljane vijase blizu pinova u visokofrekventnim sklopovima. Ideja: kratak vod do zemlje djeluje kao induktivna impedansa. Zemljani via tako\u0111er izgleda kao induktivna komponenta. To utje\u010de na funkciju filtera. Zato postavite zemljane vijase blizu pinova. Da biste smanjili induktivno optere\u0107enje, koristite vi\u0161e zemljanih vijasa nego na niskofrekventnim plo\u010dama. To pove\u0107ava kapacitet struje u zemlji i poma\u017ee da se sve ta\u010dke odr\u017ee blizu 0 V.<\/p><h2 data-start=\"10023\" data-end=\"10045\">(4) Filtriranje po snazi<\/h2><p data-start=\"10047\" data-end=\"10529\">Za TTL i CMOS dizajneri dodaju bypass kondenzatore blizu pinova napajanja kako bi smanjili logi\u010dku buku. Za visokofrekventne i mikrotalasne sklopove to nije dovoljno. Visokofrekventni signali stvaraju visokofrekventne smetnje na napajanju. Koristite serijske induktoore i kondenzatore. Odaberite induktoore prema radnoj frekvenciji. Primjer: za filtriranje \u0161uma iznad 1 MHz s C = 0,1 \u03bcF, odaberite L = 1 \u03bcH. Budite oprezni pri dodavanju indukansnosti na pinove signala s otvorenim kolektorom. Induktor tada djeluje kao prilagodna indukansnost.<\/p><h2 data-start=\"10531\" data-end=\"10547\">(5) Oklopljenje<\/h2><p data-start=\"10549\" data-end=\"10680\">Koristite oklopljenje za za\u0161titu malih ili visokofrekventnih signala. To smanjuje sna\u017ene interferencije signala i smanjuje EMI. Neke smjernice:<\/p><p data-start=\"10682\" data-end=\"10902\">A. U niskofrekventnim digitalnim\/analognim (&lt;30 MHz) malosignalnim projektima odvojite digitalnu i analognu masu i ulijte plosnatu masu u malosignalne zone. Odr\u017eavajte udaljenost izme\u0111u ulivene mase i tragova ve\u0107u od \u0161irine traga.<\/p><p data-start=\"10904\" data-end=\"11021\">B. U dizajnu malih signala na visokim frekvencijama, dodajte za\u0161titne limene posude ili pro\u0161ivene uzemljene vias kako biste izolirali podru\u010dja.<\/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. Za visokosilovne visokofrekventne sklopove, odvojite visokofrekventni dio u zaseban funkcionalni modul i dodajte metalnu za\u0161titnu kutiju kako biste smanjili zra\u010denje. Na primjer, moduli opti\u010dkih vlakana za prijenos podataka pri brzinama od 155 M, 622 M ili 2 Gb\/s.<\/p><p data-start=\"11247\" data-end=\"11435\">Vi\u0161eslojna tiskanica za mobilni telefon (primjer: Nokia 6110) mo\u017ee smjestiti komponente na obje strane i koristiti unutra\u0161nja masovna tla, kao \u0161to je prikazano na originalnoj slici. (Reference na slike su ovdje izostavljene.)<\/p><hr data-start=\"11437\" data-end=\"11440\" \/><h1 data-start=\"11442\" data-end=\"11490\">Primjeri izbora materijala za visoke ormare<\/h1><p data-start=\"11492\" data-end=\"11548\">Ispod su primjeri plo\u010da koje smo dizajnirali i otklonili gre\u0161ke:<\/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\">Primjena (frekvencija \/ ure\u0111aj)<\/th><th data-start=\"11580\" data-end=\"11599\" data-col-size=\"md\">Materijal \/ Stog<\/th><th data-start=\"11599\" data-end=\"11608\" data-col-size=\"md\">Bilje\u0161ke<\/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 relej sa raspr\u0161enim spektrom<\/td><td data-col-size=\"md\" data-start=\"11656\" data-end=\"11700\">FR-4, \u010detveroslojna tiskanica s velikim masovnim uzemljenjima<\/td><td data-col-size=\"md\" data-start=\"11700\" data-end=\"11797\">Odvojen analogni dio visoke frekvencije. Napojne linije koriste induktore za izolaciju od digitalnog dijela.<\/td><\/tr><tr data-start=\"11798\" data-end=\"11939\"><td data-start=\"11798\" data-end=\"11823\" data-col-size=\"sm\">2,4 GHz RF predajnik-prijemnik<\/td><td data-col-size=\"md\" data-start=\"11823\" data-end=\"11859\">PTFE materijal, dvostrana plo\u010da<\/td><td data-col-size=\"md\" data-start=\"11859\" data-end=\"11939\">RF predajnik i prijemnik u odvojenim metalnim oklopnim ku\u0107i\u0161tima; ulazna snaga filtrirana.<\/td><\/tr><tr data-start=\"11940\" data-end=\"12035\"><td data-start=\"11940\" data-end=\"11965\" data-col-size=\"sm\">1.9 GHz RF predajnik-prijemnik<\/td><td data-col-size=\"md\" data-start=\"11965\" data-end=\"11994\">PTFE materijal, 4-slojna tiskanica<\/td><td data-col-size=\"md\" data-start=\"11994\" data-end=\"12035\">Koristite velike izlijevanja na tlu i za\u0161titu.<\/td><\/tr><tr data-start=\"12036\" data-end=\"12123\"><td data-start=\"12036\" data-end=\"12061\" data-col-size=\"sm\">140 MHz IF predajnik-prijemnik<\/td><td data-col-size=\"md\" data-start=\"12061\" data-end=\"12086\">Gornji sloj S1139 0,3 mm<\/td><td data-col-size=\"md\" data-start=\"12086\" data-end=\"12123\">Veliko izlijevanje u tlu; putem izolacije.<\/td><\/tr><tr data-start=\"12124\" data-end=\"12223\"><td data-start=\"12124\" data-end=\"12148\" data-col-size=\"sm\">70 MHz IF predajnik-prijemnik<\/td><td data-col-size=\"md\" data-start=\"12148\" data-end=\"12168\">FR-4, \u010detveroslojna \u0161tampana plo\u010dica<\/td><td data-col-size=\"md\" data-start=\"12168\" data-end=\"12223\">Veliko izlijevanje tla; izolacija modula pomo\u0107u ograda.<\/td><\/tr><tr data-start=\"12224\" data-end=\"12385\"><td data-start=\"12224\" data-end=\"12247\" data-col-size=\"sm\">30 W poja\u010dalo snage<\/td><td data-col-size=\"md\" data-start=\"12247\" data-end=\"12283\">RO4350 materijal, dvostrana tiskanica<\/td><td data-col-size=\"md\" data-start=\"12283\" data-end=\"12385\">Veliko izlijevanje zemlje; razmak kontroliran na &gt;= 50 \u03a9 \u0161irine linije; za\u0161titna kutija i filtracija napajanja.<\/td><\/tr><tr data-start=\"12386\" data-end=\"12491\"><td data-start=\"12386\" data-end=\"12414\" data-col-size=\"sm\">2000 MHz mikrotalasni izvor<\/td><td data-col-size=\"md\" data-start=\"12414\" data-end=\"12433\">S1139 0,8 mm vrh<\/td><td data-col-size=\"md\" data-start=\"12433\" data-end=\"12491\">Dvostrana tiskanica; precizna kontrola dimenzija tragova.<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"12493\" data-end=\"12573\">Koristite ove kao primjere. Svaki projekt zahtijeva vlastiti materijal i odabir debljine.<\/p><hr data-start=\"12575\" data-end=\"12578\" \/><h1 data-start=\"12580\" data-end=\"12622\">Zahtjevi za materijal visokofrekventnih tiskanih plo\u010dica<\/h1><p data-start=\"12624\" data-end=\"12677\">Dizajneri bi trebali provjeriti ove klju\u010dne svojstva materijala:<\/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\">Dielektri\u010dni gubici (Df, tangens ugla gubitka)<\/strong> Mora biti vrlo malo. Mali gubitak zna\u010di manje slabljenja signala.<\/p><\/li><li data-start=\"12785\" data-end=\"12884\"><p data-start=\"12788\" data-end=\"12884\"><strong data-start=\"12788\" data-end=\"12812\">Niska apsorpcija vode<\/strong> je va\u017eno. Visok unos vode mijenja dielektri\u010dnu konstantu i gubitke.<\/p><\/li><li data-start=\"12885\" data-end=\"13021\"><p data-start=\"12888\" data-end=\"13021\"><strong data-start=\"12888\" data-end=\"12916\">Dielektri\u010dna konstanta (DK)<\/strong> Mora biti nizak i stabilan. Ni\u017ei DK omogu\u0107ava ve\u0107u brzinu signala. Stabilnost DK-a tako\u0111er poma\u017ee u kontroli impedanse.<\/p><\/li><li data-start=\"13022\" data-end=\"13167\"><p data-start=\"13025\" data-end=\"13167\"><strong data-start=\"13025\" data-end=\"13050\">CTE i toplotna podudarnost<\/strong> Razlika izme\u0111u bakarne folije i podloge mora biti sli\u010dna. Velika razlika pri promjenama temperature mo\u017ee uzrokovati delaminaciju bakra.<\/p><\/li><\/ol><p data-start=\"13169\" data-end=\"13256\">Visoka frekvencija \u010desto podrazumijeva upotrebu fluoropolimernih podloga poput PTFE-a (poznatog kao Teflon).<\/p><hr data-start=\"13258\" data-end=\"13261\" \/><h1 data-start=\"13263\" data-end=\"13321\">Napomene i upozorenja za proizvodnju visokofrekventnih \u0161tampanih plo\u010dica<\/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\">Kontrola impedanse je stroga.<\/strong> Tolerancija \u0161irine linije je uska. Tipi\u010dna kontrolna tolerancija je ~ \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 adhezija je niska na posebnim materijalima.<\/strong> Koristite plazma bru\u0161enje povr\u0161ine za rupe i povr\u0161ine kako biste pove\u0107ali prianjanje pri galvanizaciji i pri za\u0161titnom sloju za lemljenje.<\/p><\/li><li data-start=\"13581\" data-end=\"13711\"><p data-start=\"13584\" data-end=\"13711\"><strong data-start=\"13584\" data-end=\"13627\">Ne brusite plo\u010du prije lemljenja.<\/strong> Ovo smanjuje prianjanje. Koristite samo mikro-et\u0161 otopine ili druge metode hrapavljenja.<\/p><\/li><li data-start=\"13712\" data-end=\"13843\"><p data-start=\"13715\" data-end=\"13843\"><strong data-start=\"13715\" data-end=\"13783\">PTFE plo\u010de \u010desto uzrokuju hrapave rubove standardnim alatima za glodanje.<\/strong> Koristite posebne frezne glave i slijedite prakse za ru\u0161anje PTFE-a.<\/p><\/li><\/ol><hr data-start=\"13845\" data-end=\"13848\" \/><h1 data-start=\"13850\" data-end=\"13868\">Kratak zaklju\u010dak<\/h1><p data-start=\"13870\" data-end=\"14235\">Visokofrekventne tiskane plo\u010de zahtijevaju posebne materijale i pa\u017eljivu kontrolu procesa. Odaberite materijal koji odgovara va\u0161im frekvencijskim i toplinskim potrebama. Kontrolirajte impedanciju i postavite masovne prolaze blizu. Koristite za\u0161titu i ispravno filtriranje napajanja. Slijedite posebne korake rukovanja za PTFE i druge mikrotalasne laminate. Ovi koraci pobolj\u0161avaju performanse i iskoristivost u visokofrekventnim sklopovima.<\/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-e-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\" data-e-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-e-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\">\u010cesto postavljana pitanja<\/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-e-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\">Koji se materijali podloge obi\u010dno koriste za visokofrekventne \u0161tampane plo\u010dice?<\/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>Tipi\u010dni materijali uklju\u010duju laminate na bazi PTFE-a (Teflon) i in\u017eenjerske kompozite od dobavlja\u010da poput Rogersa (RO3000\/RO4000\/RT\/duroid) i Isolle, odabrane zbog niskog tangensa gubitka i stabilne dielektri\u010dne konstante.<\/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\">Za\u0161to jednostavno ne koristiti FR-4 za RF\/visokofrekventne dizajne?<\/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 ima ve\u0107i dielektri\u010dni gubitak i manje stabilnu dielektri\u010dnu konstantu na GHz frekvencijama, \u0161to pove\u0107ava gubitak signala i varijabilnost impedanse; za mnoge RF ili mikrotalasne primjene laminati klase PTFE\/Rogers pokazuju znatno bolje performanse.<\/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\">Koja elektri\u010dna svojstva su najva\u017enija (Dk, tangens gubitka)?<\/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>Dielektri\u010dna konstanta (Dk) kontrolira impedanciju i brzinu signala; tangens gubitka (Df) odre\u0111uje slabljenje signala. Niska, stabilna vrijednost Dk i nizak tangens gubitka su klju\u010dni za dosljedne visokofrekventne performanse.<\/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\">Tipi\u010dne primjene visokofrekventnih tiskanih plo\u010dica?<\/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>Antene, RF poja\u010dala, filtri, 5G bazne stanice, mikrotalasne radio veze, satelitske komunikacije, radar i visokobrzinski RF moduli.<\/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\">Kako odabrati pravi visokofrekventni laminat?<\/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>Uskladite potreban frekvencijski opseg, ciljanu stabilnost impedanse, toplinske\/CTE zahtjeve i tangens gubitka. Pregledajte tehni\u010dke listove dobavlja\u010da (Rogers, Isola itd.) i zatra\u017eite podatke o ispitivanju materijala (Dk\/Df u odnosu na frekvenciju).<\/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 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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. 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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\\\" data-e-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-e-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\\\" data-e-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-e-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-e-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. 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