{"id":2145,"date":"2025-08-29T07:13:53","date_gmt":"2025-08-29T07:13:53","guid":{"rendered":"https:\/\/flj-pcb.com\/?page_id=2145"},"modified":"2025-09-25T09:02:55","modified_gmt":"2025-09-25T09:02:55","slug":"rf-pcb","status":"publish","type":"page","link":"https:\/\/flj-pcb.com\/bs\/pcb-manufacturer\/rf-pcb\/","title":{"rendered":"Pravila dizajna za RF \u0161tampane plo\u010dice: od materijala do rasporeda"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"2145\" class=\"elementor elementor-2145\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-553a1cd e-flex e-con-boxed e-con e-parent\" data-id=\"553a1cd\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1e7d27b elementor-widget elementor-widget-text-editor\" data-id=\"1e7d27b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"10\" data-end=\"220\">RF PCB je vrsta \u0161tampane plo\u010dice (PCB) namijenjena za prijenos i obradu radiofrekvencijskih signala. Ovi signali su visoke frekvencije. Obi\u010dno imaju frekvenciju jednaku ili ve\u0107u od 300 kHz i do 300 GHz.<\/p><p data-start=\"10\" data-end=\"220\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-2746\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-PCB.webp\" alt=\"RF PCB\" width=\"633\" height=\"500\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-PCB.webp 633w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-PCB-300x237.webp 300w\" sizes=\"(max-width: 633px) 100vw, 633px\" \/><\/p><p data-start=\"10\" data-end=\"220\">\u00a0<\/p><p data-start=\"222\" data-end=\"870\">Radiofrekvencija, ili RF, je naziv za grupu elektromagnetnih talasa. Ljudi koriste ovaj naziv kada talasi mogu slu\u017eiti za radio komunikaciju. Opseg frekvencija za RF nije uvijek isti u razli\u010ditim knjigama. Neke knjige navode da RF obuhvata opseg od 30 MHz do 3 GHz. Neki ka\u017eu da je to od 300 MHz do 40 GHz. Ovi rasponi se mogu preklapati s rasponom nazvanim mikrotalasni. Neke druge knjige koriste druga\u010diji na\u010din podjele spektra. Ka\u017eu da su u jednoj grupi valovi s valnom du\u017einom od 1 megametra do 1 metra. To daje frekvencije od 30 Hz do 300 MHz. Granica izme\u0111u RF-a i mikrotalasnih nije vrlo jasna. Granica se mo\u017ee mijenjati kako dijelovi i metode dizajna postaju bolji.<\/p><h1 data-start=\"872\" data-end=\"902\">RF PCB i njegove glavne karakteristike<\/h1><p data-start=\"904\" data-end=\"1662\">Kada dizajniramo \u0161tampanu plo\u010dicu (PCB) za RF upotrebu, moramo razmisliti o tome kako se transmisijske linije pona\u0161aju. Za \u017eicu ili trag na PCB-u, mo\u017eemo ga modelirati na dva na\u010dina. Jedan je model zbijenih elemenata. Drugi je model distribuiranih parametara. Op\u0107e pravilo je sljede\u0107e. Ako je geometrijska du\u017eina l podijeljena s valnom du\u017einom \u03bb jednaka ili ve\u0107a od 0,05, onda koristimo distribuirani model. U ovoj bilje\u0161ci, RF veza zna\u010di sklop gdje prenosna linija zahtijeva distribuirani model. U praksi, du\u017eina staze na PCB-u rijetko je du\u017ea od 50 cm. Stoga mo\u017eemo po\u010deti od analognih signala na 30 MHz. Signali iznad 3 GHz \u010desto se nazivaju mikrotalasnim. Zbog proizvodnih ograni\u010denja, gdje razmak elemenata mo\u017ee biti 0,5 mm, ljudi ponekad postavljaju gornju frekvenciju na 30 GHz. Ali to nije uvijek korisno.<\/p><p data-start=\"1664\" data-end=\"1875\">Na osnovu ovih ta\u010daka mo\u017eemo re\u0107i da je RF PCB \u0161tampana plo\u010dica za analogne signale \u010dija je frekvencija otprilike od 30 MHz do 6 GHz. Izbor izme\u0111u lumped ili distributed modela treba da se zasniva na gore navedenoj formuli i radnoj frekvenciji.<\/p><p data-start=\"1877\" data-end=\"2307\">Budu\u0107i da je dielektri\u010dna konstanta podloge obi\u010dno visoka, valovi se kre\u0107u sporije u plo\u010di nego u zraku. To skra\u0107uje valnu duljinu na plo\u010di. Za mikrostrip i druge vodove podloga mora imati niske dielektri\u010dne gubitke. Dielektri\u010dna konstanta ne bi smjela znatno varirati u potrebnom frekvencijskom i temperaturnom rasponu. Podloga bi trebala imati dobru toplinsku provodnost i glatku povr\u0161inu. Mora dobro prianjati uz provodnik.<\/p><p data-start=\"2309\" data-end=\"2499\">Za metal na tragu potrebna nam je visoka provodnost. Metal bi trebao imati mali temperaturni koeficijent otpora. Trebao bi se dobro zalijepiti za podlogu. Trebao bi se lako lemiti.<\/p><h1 data-start=\"0\" data-end=\"43\">Principi za odabir materijala RF plo\u010de<\/h1><h2 data-start=\"45\" data-end=\"85\">Uloga podloge u mikrotalasnim tiskanim plo\u010dicama<\/h2><p data-start=\"86\" data-end=\"290\">Tiskana plo\u010dica mikrotalasne frekvencije nije samo nosa\u010d komponenti. Ona je tako\u0111er medij za mikrotalasna elektromagnetska polja. Stoga je za RF kola najbolji izbor visokofrekventni ili mikrotalasni podloga.<\/p><h2 data-start=\"292\" data-end=\"320\">Kontrola impedanse traga<\/h2><p data-start=\"321\" data-end=\"705\">Na RF PCB-u tiskani vodovi moraju slijediti uobi\u010dajena pravila, poput kapacitivnosti struje. Osim toga, moramo kontrolirati karakteristi\u010dnu impedanciju vodova. Vodovi moraju biti uskla\u0111eni po impedanciji. Dakle, proces izrade PCB-a mora kontrolirati impedanciju vodova. Karakteristi\u010dna impedancija vodova ovisi o materijalu PCB-a i njegovim fizi\u010dkim parametrima. Stoga dizajneri PCB-a moraju poznavati performanse materijala.<\/p><h2 data-start=\"707\" data-end=\"747\">Zahtjevi za materijale za RF plo\u010de<\/h2><p data-start=\"748\" data-end=\"1107\">RF plo\u010de obi\u010dno zahtijevaju visoke frekvencije i visoke performanse. Ljudi biraju podlogu s preciznom dielektri\u010dnom konstantom. Podloga treba biti stabilna i imati niske gubitke. Tako\u0111er, materijal mora biti kompatibilan s proizvodnjom. Na primjer, mora izdr\u017eati visokotemperaturno taljenje lemom. Na\u0161a kompanija \u010desto koristi FR4, TACONIC i materijale iz ROGERS-a za RF bazni materijal.<\/p><h2 data-start=\"1109\" data-end=\"1134\">FR-4 karakteristike<\/h2><p data-start=\"1135\" data-end=\"1593\">FR4 (epoksidno stakleno tkivo sa bakrenom oblogom i plamenom otpornim svojstvima) ima dielektri\u010dnu konstantu Er ispitanu na 1 GHz kao Er = 4,3 \u00b1 0,2. Stakleni prijelazni temperatur Tg je 135 \u00b0C. Za uobi\u010dajene plo\u010de koristimo dvije vrste plo\u010da. Jedna je standardni materijal za plo\u010de. To je jeftino i ima zreli proces. Druga je UV plo\u010da, \u010desto nazvana \u017euta plo\u010da. Ima UV-BLOKIRANJE za blokiranje ultraljubi\u010dastog zra\u010denja. Koristimo je za vanjske slojeve. Njena performansa je malo bolja od standardne plo\u010de.<\/p><figure id=\"attachment_2743\" aria-describedby=\"caption-attachment-2743\" style=\"width: 688px\" class=\"wp-caption alignnone\"><img decoding=\"async\" class=\"wp-image-2743 size-full\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/fr-4.webp\" alt=\"fr-4\" width=\"688\" height=\"459\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/fr-4.webp 688w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/fr-4-300x200.webp 300w\" sizes=\"(max-width: 688px) 100vw, 688px\" \/><figcaption id=\"caption-attachment-2743\" class=\"wp-caption-text\">fr-4<\/figcaption><\/figure><h2 data-start=\"1595\" data-end=\"1616\">TACONIC materijal<\/h2><p data-start=\"1617\" data-end=\"1696\"><a href=\"https:\/\/www.taconic.com\/\" target=\"_blank\" rel=\"noopener\">Takoni\u010dki<\/a> je dobro poznat brend. Ima mnogo specifikacija. Njegova cijena je vi\u0161a od fr4.<\/p><h2 data-start=\"1698\" data-end=\"1718\">ROGERS materijal<\/h2><p data-start=\"1719\" data-end=\"1962\">ROGERS materijal ima visoku ta\u010dnost dielektri\u010dne konstante. Stabilan je na temperaturi i ima niske gubitke. Koristimo ga za kola visoke snage. Proizvodnja i obrada PCB-a su sli\u010dni onima za FR4, pa je tro\u0161ak izrade nizak. Me\u0111utim, adhezija bakarne folije je slaba.<\/p><h1 data-start=\"4343\" data-end=\"4360\">Tabela supstrata<\/h1><div class=\"_tableContainer_1rjym_1\"><div class=\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"4362\" data-end=\"4924\"><thead data-start=\"4362\" data-end=\"4443\"><tr data-start=\"4362\" data-end=\"4443\"><th data-start=\"4362\" data-end=\"4376\" data-col-size=\"sm\">Vrsta materijala<\/th><th data-start=\"4376\" data-end=\"4395\" data-col-size=\"sm\">Tipi\u010dni materijal<\/th><th data-start=\"4395\" data-end=\"4409\" data-col-size=\"sm\">Dk (10 GHz)<\/th><th data-start=\"4409\" data-end=\"4423\" data-col-size=\"sm\">Df (10 GHz)<\/th><th data-start=\"4423\" data-end=\"4443\" data-col-size=\"md\">Karakteristike i upotreba<\/th><\/tr><\/thead><tbody data-start=\"4469\" data-end=\"4924\"><tr data-start=\"4469\" data-end=\"4622\"><td data-start=\"4469\" data-end=\"4493\" data-col-size=\"sm\">Fluoropolimerni podloga<\/td><td data-start=\"4493\" data-end=\"4526\" data-col-size=\"sm\">PTFE (politetraflouroetilen)<\/td><td data-start=\"4526\" data-end=\"4536\" data-col-size=\"sm\">2.1\u20132.3<\/td><td data-start=\"4536\" data-end=\"4551\" data-col-size=\"sm\">0.0005\u20130.001<\/td><td data-start=\"4551\" data-end=\"4622\" data-col-size=\"md\">Vrlo niski gubici. Pogodno za mmVal. Koristi se za 5G bazne stanice i radar.<\/td><\/tr><tr data-start=\"4623\" data-end=\"4766\"><td data-start=\"4623\" data-end=\"4648\" data-col-size=\"sm\">Podloga ispunjena keramikom<\/td><td data-start=\"4648\" data-end=\"4671\" data-col-size=\"sm\">Rogers serija RO4000<\/td><td data-start=\"4671\" data-end=\"4682\" data-col-size=\"sm\">3.38\u20134.5<\/td><td data-start=\"4682\" data-end=\"4697\" data-col-size=\"sm\">0.0027\u20130.004<\/td><td data-start=\"4697\" data-end=\"4766\" data-col-size=\"md\">Srednja cijena. Pogodno za mikrotalasnu pe\u0107nicu. Koristi se za WiFi i Bluetooth module.<\/td><\/tr><tr data-start=\"4767\" data-end=\"4924\"><td data-start=\"4767\" data-end=\"4789\" data-col-size=\"sm\">Podloga od staklenih vlakana<\/td><td data-start=\"4789\" data-end=\"4829\" data-col-size=\"sm\">Visokofrekventni FR4 (kao Isola FR408)<\/td><td data-start=\"4829\" data-end=\"4839\" data-col-size=\"sm\">3.9\u20134.2<\/td><td data-start=\"4839\" data-end=\"4852\" data-col-size=\"sm\">0.008\u20130.01<\/td><td data-start=\"4852\" data-end=\"4924\" data-col-size=\"md\">Niska cijena. Dobro za srednji i niski RF. Koristi se za voki-tokije i sli\u010dno.<\/td><\/tr><\/tbody><\/table><\/div><\/div><h1 data-start=\"4926\" data-end=\"4965\">RF problemi u dizajnu \u0161tampanih plo\u010dica i rje\u0161enja<\/h1><p data-start=\"4967\" data-end=\"5457\">Op\u0107enito, za kola s frekvencijom ispod mikrotalasne (\u0161to uklju\u010duje niskofrekventna i digitalna kola niske brzine), pa\u017eljiv raspored je prvi klju\u010d uspjeha. Ako poznajete pravila, mo\u017eete napraviti dobar dizajn. Za mikrostrip i visokobrzinska digitalna kola na nivou PCB-a mogu biti potrebne dvije ili tri verzije PCB-a kako bi se osigurala kvaliteta kola. Za RF kola s frekvencijom iznad mikrotalasne, trebat \u0107e vam vi\u0161e verzija za pobolj\u0161anje performansi. Dakle, suo\u010dit \u0107ete se s mnogim izazovima tokom dizajna RF kola.<\/p><p data-start=\"5459\" data-end=\"5503\">U nastavku navodimo uobi\u010dajene probleme i rje\u0161enja.<\/p><h2 data-start=\"5505\" data-end=\"5544\">Uobi\u010dajeni problemi u dizajnu RF sklopova<\/h2><ol data-start=\"5546\" data-end=\"7663\"><li data-start=\"5546\" data-end=\"6328\"><p data-start=\"5549\" data-end=\"6328\"><b>Interferencija izme\u0111u digitalnih i analognih modula<\/b><br data-start=\"5596\" data-end=\"5599\" \/>Kada analogni RF i digitalni dijelovi rade odvojeno, svaki mo\u017ee raditi dobro. Ali kada se pomije\u0161aju na istoj plo\u010di i dijele napajanje, cijeli sistem mo\u017ee postati nestabilan. Digitalni signali osciliraju izme\u0111u mase i Vcc za vi\u0161e od 3 V. Period mo\u017ee biti kratak, u nanosekundnom rasponu. Zbog velike amplitude i brzog prebacivanja, digitalni signali sadr\u017ee visokofrekventne komponente koje ne ovise o taktu prebacivanja. U analognom dijelu, od pode\u0161ene radio petlje do prijemnika, napon mo\u017ee biti manji od 1 \u03bcV. Razlika izme\u0111u malog RF signala i digitalne buke mo\u017ee biti ve\u0107a od 120 dB. Ako se digitalni signali ne dr\u017ee podalje od RF-a, slab RF signal mo\u017ee biti o\u0161te\u0107en. Radio mo\u017ee prestati raditi ili raditi lo\u0161e.<\/p><\/li><li data-start=\"6330\" data-end=\"6831\"><p data-start=\"6333\" data-end=\"6831\"><b>Smetnje od buke napajanja<\/b><br data-start=\"6364\" data-end=\"6367\" \/>RF sklopovi su osjetljivi na \u0161um. Osjetljivi su na skokove napona i druge visokofrekventne harmonike. Mikro kontroler \u0107e iznenada povla\u010diti veliku struju u svakom unutra\u0161njem taktu. Ve\u0107ina modernih mikrokontrolera koristi CMOS. Ako mikrokontroler radi s internim taktom od 1 MHz, vu\u0107i \u0107e struju tom brzinom. Ako nemamo dobro odvo\u0111enje napajanja, do\u0107i \u0107e do \u0161uma napona na linijama napajanja. Ako naponski skokovi dospiju do RF pinova za napajanje, RF blok mo\u017ee otkazati.<\/p><\/li><li data-start=\"6833\" data-end=\"7315\"><p data-start=\"6836\" data-end=\"7315\"><b>Lo\u0161 dizajn tla<\/b><br data-start=\"6853\" data-end=\"6856\" \/>Ako masa nije dobro dizajnirana za RF, mogu se dogoditi \u010dudni rezultati. U digitalnom dizajnu ve\u0107ina kola i dalje radi \u010dak i ako masa nije savr\u0161ena. Ali u RF-u \u010dak i kratki vodovi za masu pona\u0161aju se kao induk\u0442\u043e\u0440\u0438. Na primjer, 1 nH indukancije odgovara otprilike 1 mm duljine. Iz toga mo\u017eemo pretpostaviti da traga na PCB-u du\u017eine 10 mm ima reaktansu od oko 27 ohma. Ako nemamo dobru masu, mnoge trage za masu bit \u0107e duge i kolosijek ne\u0107e zadr\u017eati svoje projektirane karakteristike.<\/p><\/li><li data-start=\"7317\" data-end=\"7663\"><p data-start=\"7320\" data-end=\"7663\"><b>Zra\u010denje antene koje ometa druge analogne sklopove<\/b><br data-start=\"7376\" data-end=\"7379\" \/>U rasporedu \u0161tampane plo\u010dice postoje i drugi analogni dijelovi. Mnoge plo\u010dice imaju ADC ili DAC. Sna\u017ean RF signal iz predajnika mo\u017ee dospjeti do ulaza ADC-a. Svaki vod mo\u017ee djelovati kao antena. Ako ulaz ADC-a nije dobro za\u0161ti\u0107en, RF mo\u017ee u\u0107i u njegovu ESD diodu i uzrokovati pomak ili gre\u0161ke u ADC-u.<\/p><\/li><\/ol><h2 data-start=\"7665\" data-end=\"7710\">Principi i rje\u0161enja za dizajn RF kola<\/h2><h3 data-start=\"7712\" data-end=\"7744\">1. Definicija RF rasporeda<\/h3><p data-start=\"7745\" data-end=\"7791\">Kada dizajnirate RF raspored, slijedite ova pravila.<\/p><ol data-start=\"7793\" data-end=\"8272\"><li data-start=\"7793\" data-end=\"7952\"><p data-start=\"7796\" data-end=\"7952\">Dr\u017eite poja\u010dala velike snage (HPAs) i poja\u010dala niskog \u0161uma (LNAs) \u0161to je mogu\u0107e dalje jedno od drugog. Postavite komponente za prijenos velike snage daleko od komponenti za prijem male snage.<\/p><\/li><li data-start=\"7953\" data-end=\"8096\"><p data-start=\"7956\" data-end=\"8096\">Na visokofrekventnim podru\u010djima na PCB-u imajte najmanje jednu punu uzemljivu ravan ispod i izbjegavajte vijase u njoj. \u0160to je ve\u0107a bakrena povr\u0161ina, to je bolje.<\/p><\/li><li data-start=\"8097\" data-end=\"8153\"><p data-start=\"8100\" data-end=\"8153\">Rasipanje struje i odvajanje napajanja su jednako va\u017eni.<\/p><\/li><li data-start=\"8154\" data-end=\"8196\"><p data-start=\"8157\" data-end=\"8196\">Postavite RF izlaze podalje od RF ulaza.<\/p><\/li><li data-start=\"8197\" data-end=\"8272\"><p data-start=\"8200\" data-end=\"8272\">Postavite osjetljive analogne signale daleko od brzorazrednih digitalnih i RF signala.<\/p><\/li><\/ol><p><img decoding=\"async\" class=\"alignnone size-full wp-image-2742\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Definition-of-RF-layout.webp\" alt=\"Definition of RF layout\" width=\"600\" height=\"399\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Definition-of-RF-layout.webp 600w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Definition-of-RF-layout-300x200.webp 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p><h3 data-start=\"8274\" data-end=\"8339\">2. Pravila za projektovanje fizi\u010dke i elektri\u010dne particije<\/h3><p data-start=\"8340\" data-end=\"8619\">Particija zna\u010di razdvajanje plo\u010de po funkciji. Mo\u017eete napraviti fizi\u010dku i elektri\u010dnu particiju. Fizi\u010dka particija se bavi rasporedom dijelova, smjerom i za\u0161titnim plo\u010dama. Elektri\u010dna particija se bavi raspodjelom napajanja, RF rutiranjem, osjetljivim dijelovima, signalima i zonama uzemljenja.<\/p><p data-start=\"8340\" data-end=\"8619\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2745\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-partition.webp\" alt=\"RF partition\" width=\"640\" height=\"511\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-partition.webp 640w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-partition-300x240.webp 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/p><h4 data-start=\"8621\" data-end=\"8660\">a. Principi fizi\u010dke podjele<\/h4><p data-start=\"8661\" data-end=\"8890\">Raspore\u0111ivanje komponenti je klju\u010dno za dobar RF dizajn. Dobra metoda je prvo postaviti komponente du\u017e RF puta. Zatim postavite njihov smjer. Postavite ulaze podalje od izlaza. Dr\u017eite komponente visoke i niske snage odvojeno. To poma\u017ee skratiti RF puteve.<\/p><h4 data-start=\"8892\" data-end=\"8930\">b. Princip dizajna slojeva PCB-a<\/h4><p data-start=\"8931\" data-end=\"9200\">Dobar stackup postavlja glavnu uzemljivu ravan na sloj ispod sloja tragova. Postavite RF tragove na ravan. Napravite male vias na RF putanjama. To smanjuje induktanciju putanje i broj hladnih lemnih spojeva na glavnom uzemljenju. Tako\u0111er \u0107e manje RF energije curiti u druge slojeve.<\/p><p data-start=\"8931\" data-end=\"9200\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2744\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-circuit-design.webp\" alt=\"\" width=\"640\" height=\"462\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-circuit-design.webp 640w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-circuit-design-300x217.webp 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/p><h4 data-start=\"9202\" data-end=\"9244\">c. RF dijelovi i principi RF tragova<\/h4><p data-start=\"9245\" data-end=\"9660\">U prostoru za plo\u010du, linearni krugovi poput vi\u0161estupanjskih poja\u010dala mogu odvojiti RF zone. Ali duplexeri, mikseri i IF poja\u010dala \u010desto dovode do toga da se mnogi RF i IF signali pojavljuju blizu jedni drugih. Trebate paziti da smanjite ovo uzajamno djelovanje. Provedite RF i IF tragove pa\u017eljivo i ostavite prostor za uzemljenje izme\u0111u njih. Ispravan RF put je klju\u010dan za performanse PCB-a. Zato raspored komponenti oduzima ve\u0107inu vremena pri dizajniranju PCB-a za telefone.<\/p><h4 data-start=\"9662\" data-end=\"9702\">d. Princip elektri\u010dne pregrade<\/h4><p data-start=\"9703\" data-end=\"9974\">Ve\u0107ina napajanja u telefonskim krugovima je niskog istosmjernog napona, pa vam nisu potrebne posebne \u0161iroke staze. Ali za napajanje visokosna\u017enih poja\u010dala morate napraviti \u0161iroke staze zbog velikog strujnog optere\u0107enja. Time se pad napona odr\u017eava niskim. Koristite mnogo vias da biste preusmjerili struju s jedne ravni na drugu i izbjegli gubitak struje.<\/p><p data-start=\"9976\" data-end=\"10253\">Odspajanje napajanja za komponente visoke snage je va\u017eno. Ako ne uspijete odspojiti napajanje na pin visokosna\u017enog poja\u010dala, mogu se pojaviti mnogi problemi. \u0160um visoke snage mo\u017ee se \u0161iriti po plo\u010di. Masa za visokosna\u017ena poja\u010dala je vrlo va\u017ena. Projektanti \u010desto trebaju metalnu za\u0161titnu kutiju.<\/p><h4 data-start=\"10255\" data-end=\"10300\">e. Princip izolacije RF ulaza\/izlaza<\/h4><p data-start=\"10301\" data-end=\"10697\">Vrlo je va\u017eno dr\u017eati RF izlaz podalje od RF ulaza. Ovo se odnosi na poja\u010dala, bufere i filtre. U najgorem slu\u010daju, ako se izlaz poja\u010dala ili bufera vrati na njegov ulaz s pravom fazom i amplitudom, komponenta mo\u017ee u\u0107i u samoresonanciju. U najboljem slu\u010daju, sklop \u0107e biti stabilan pri svim temperaturama i naponima. U lo\u0161em slu\u010daju, on \u0107e dodati \u0161um i intermodulaciju RF signalu.<\/p><h1 data-start=\"10699\" data-end=\"10708\">Sa\u017eetak<\/h1><p data-start=\"10710\" data-end=\"10978\">Ukratko, RF kola rade s linijama distribuiranih parametara. Pokazuju ko\u017eni efekt i uzajamno djelovanje. To ih \u010dini razli\u010ditim od niskofrekventnih i istosmjernih kola. Dakle, pri dizajniranju RF PCB-a morate se usredoto\u010diti na gore navedene ta\u010dke. Ako to u\u010dinite, dizajn \u0107e biti u\u010dinkovit i precizan.<\/p><ol data-start=\"11035\" data-end=\"12161\"><li data-start=\"11164\" data-end=\"11250\"><p data-start=\"11167\" data-end=\"11250\">Dr\u017eite tragove kratkim kad god je to mogu\u0107e. Kratki tragovi smanjuju gubitke i ne\u017eeljenu reaktanciju.<\/p><\/li><li data-start=\"11251\" data-end=\"11384\"><p data-start=\"11254\" data-end=\"11384\">Koristite odgovaraju\u0107i supstrat za potrebnu frekvenciju. FR4 je prihvatljiv u mnogim slu\u010dajevima. Koristite Rogers ili PTFE za niske gubitke na visokim frekvencijama.<\/p><\/li><li data-start=\"11385\" data-end=\"11496\"><p data-start=\"11388\" data-end=\"11496\">Kontrolirajte impedanciju tragova. Koristite odgovaraju\u0107u \u0161irinu, razmak i slojevnu strukturu. Mjerite ili izra\u010dunajte pomo\u0107u alata.<\/p><\/li><li data-start=\"11497\" data-end=\"11626\"><p data-start=\"11500\" data-end=\"11626\">Dr\u017eite digitalne i RF komponente odvojeno. Svakom dijelu osigurajte vlastiti povratni vod za masu. Koristite dekupiranje na pinovima za napajanje blizu komponente.<\/p><\/li><li data-start=\"11627\" data-end=\"11703\"><p data-start=\"11630\" data-end=\"11703\">Koristite uzemljene ravnine i male vijase za povrat RF-a. To smanjuje induktansu.<\/p><\/li><li data-start=\"11704\" data-end=\"11788\"><p data-start=\"11707\" data-end=\"11788\">Postavite filtre i za\u0161titu u blizini osjetljivih dijelova. To smanjuje ne\u017eeljeno primanje smetnji.<\/p><\/li><li data-start=\"11789\" data-end=\"11922\"><p data-start=\"11792\" data-end=\"11922\">Testirajte s prototipovima. RF obi\u010dno zahtijeva vi\u0161e krugova rasporeda i pode\u0161avanja. Male promjene mogu imati velike efekte na visokim frekvencijama.<\/p><\/li><li data-start=\"11923\" data-end=\"12058\"><p data-start=\"11926\" data-end=\"12058\">Za antene osigurajte dovoljno slobodnog prostora i dr\u017eite metalne i druge tragove podalje. Prilago\u0111avanje i pode\u0161avanje antene \u010desto zahtijevaju prostor na plo\u010di i testiranje.<\/p><\/li><li data-start=\"12059\" data-end=\"12161\"><p data-start=\"12063\" data-end=\"12161\">Kada pravite staze visoke snage, napravite ih \u0161irokima i koristite mnogo via za provo\u0111enje struje izme\u0111u slojeva.<\/p><\/li><\/ol><h1 data-start=\"12163\" data-end=\"12198\">Osnovne formule i pravila za provjeru<\/h1><ol data-start=\"12200\" data-end=\"12606\"><li data-start=\"12200\" data-end=\"12326\"><p data-start=\"12203\" data-end=\"12326\">Koristite l\/\u03bb \u2265 0,05 da biste provjerili treba li tragu distribuirani model. l je geometrijska du\u017eina. \u03bb je radna valna duljina u mediju.<\/p><\/li><li data-start=\"12327\" data-end=\"12438\"><p data-start=\"12330\" data-end=\"12438\">Za brzo mjerenje indukancije, 1 nH je otprilike 1 mm staze. Koristite ovo da provjerite da li duge uzemljene staze dodaju indukanciju.<\/p><\/li><li data-start=\"12439\" data-end=\"12606\"><p data-start=\"12442\" data-end=\"12606\">Za kontrolu impedanse, poznajte slojevitost, \u0161irinu trake, dielektri\u010dku konstantu i udaljenost od ravnine. Koristite re\u0161ava\u010d polja ili kalkulator impedanse da biste dobili ta\u010dne vrijednosti.<\/p><\/li><\/ol>\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-vdmvn40 elementor-section-content-top elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"vdmvn40\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7882748\" data-id=\"7882748\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9fc6712 elementor-widget elementor-widget-heading\" data-id=\"9fc6712\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">\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-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\">\u0160ta je RF PCB?<\/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>RF (radiofrekvencijski) PCB je dizajniran za prijenos RF i mikrotalasnih signala (stotine MHz do vi\u0161e GHz). Koristi kontrolirane materijale, slojeve i pravila rasporeda kako bi se smanjili gubici i o\u010duvala integritet signala.<\/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\">Koji se materijali podloge obi\u010dno koriste za RF \u0161tampane plo\u010dice?<\/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>Uobi\u010dajeni izbori su laminati na bazi PTFE-a i in\u017eenjerski materijali (Rogers, Taconic itd.) za niske gubitke i stabilna dielektri\u010dna svojstva; u nekim dizajnima ni\u017ee frekvencije ili osjetljivim na tro\u0161kove mogu se koristiti visokokvalitetne FR-4 varijante.<\/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\">Za\u0161to ne koristiti uvijek FR-4 za RF dizajne?<\/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>Standardni FR-4 ima ve\u0107i dielektri\u010dni gubitak i manje stabilan Dk pri GHz frekvencijama, \u0161to pove\u0107ava prigu\u0161enje i varijabilnost impedanse\u2014tako da se za precizne RF radove obi\u010dno preferiraju laminati klase PTFE\/Rogers.<\/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\">Jesu li VIA stubovi problem za RF signale?<\/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>Da\u2014stubovi se pona\u0161aju kao kratke neokon\u010dene transmisijske linije i uzrokuju refleksije. Uobi\u010dajene mjere ubla\u017eavanja uklju\u010duju ponovno bu\u0161enje, zakopane\/nagomilane vias i pa\u017eljivo postavljanje via.<\/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\">Koji testovi potvr\u0111uju performanse RF PCB-a?<\/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>Uobi\u010dajeni testovi: VNA S-parametri (gubici umetanja\/vra\u0107anja), TDR\/provjere impedanse i termalni\/testovi starenja za verifikaciju stabilnosti Dk i dimenzionalnog pona\u0161anja.<\/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-1036\" class=\"elementor-tab-title\" data-tab=\"6\" role=\"button\" aria-controls=\"elementor-tab-content-1036\" 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\">\u0160ta trebam dostaviti proizvo\u0111a\u010du za ta\u010dnu ponudu za RF?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1036\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"6\" role=\"region\" aria-labelledby=\"elementor-tab-title-1036\"><p>Dostavite Gerber\/ODB++ datoteke, ciljne vrijednosti impedanse, ta\u010dan slojni raspored, izbor dielektrika (ili ciljne vrijednosti Dk\/Df), informacije o BGA\/razmaku, zahtjeve za via (backdrill\/via-in-pad) i sve posebne napomene za rutiranje ili sklapanje. Rana DFM revizija ubrzava proizvodnju i smanjuje rizik.<\/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>RF PCB is a type of printed circuit board (PCB) made for carrying and handling radio frequency signals. These signals [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"parent":1898,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center\";s:15:\"background-size\";s:4:\"auto\";s:21:\"background-attachment\";s:6:\"scroll\";s:15:\"background-type\";s:0:\"\";s:16:\"background-media\";s:0:\"\";s:12:\"overlay-type\";s:0:\"\";s:13:\"overlay-color\";s:0:\"\";s:15:\"overlay-opacity\";s:0:\"\";s:16:\"overlay-gradient\";s:0:\"\";}}"],"footnotes":[""],"_elementor_edit_mode":["builder"],"_elementor_template_type":["wp-page"],"_elementor_data":["[{\"id\":\"553a1cd\",\"elType\":\"container\",\"settings\":{\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"94795b0\"}]},\"elements\":[{\"id\":\"1e7d27b\",\"elType\":\"widget\",\"settings\":{\"editor\":\"<p data-start=\\\"10\\\" data-end=\\\"220\\\">RF PCB is a type of printed circuit board (PCB) made for carrying and handling radio frequency signals. These signals are high frequency. They usually have frequency equal to or above 300 kHz and up to 300 GHz.<\\\/p><p data-start=\\\"10\\\" data-end=\\\"220\\\"><img class=\\\"alignnone size-full wp-image-2746\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/RF-PCB.webp\\\" alt=\\\"RF PCB\\\" width=\\\"633\\\" height=\\\"500\\\" \\\/><\\\/p><p data-start=\\\"10\\\" data-end=\\\"220\\\">\\u00a0<\\\/p><p data-start=\\\"222\\\" data-end=\\\"870\\\">Radio frequency, or RF, is a name for a group of electromagnetic waves. People use this name when the waves can work for radio communication. The range of frequency for RF is not always the same in different books. Some books say RF is from 30 MHz to 3 GHz. Some say it is from 300 MHz to 40 GHz. These ranges can overlap with the range called microwave. Some other books use a different way to split the spectrum. They say waves with wavelength from 1 megameter to 1 meter are in a group. That gives frequencies from 30 Hz to 300 MHz. The line between RF and microwave is not very clear. The line can change as parts and design methods get better.<\\\/p><h1 data-start=\\\"872\\\" data-end=\\\"902\\\">RF PCB and its main features<\\\/h1><p data-start=\\\"904\\\" data-end=\\\"1662\\\">When we design a PCB for RF use, we must think about how transmission lines behave. For a wire or trace on a PCB, we can model it in two ways. One is the lumped element model. The other is the distributed parameter model. A common rule is this. If the geometric length l divided by the wavelength \\u03bb is equal to or larger than 0.05, then we use the distributed model. In this note, an RF link means a circuit where the transmission line needs the distributed model. In practice, PCB trace length is rarely longer than 50 cm. So we can start from analog signals at 30 MHz. Signals above 3 GHz are often called microwave. For production limits where element spacing can be 0.5 mm, people sometimes set the top frequency to 30 GHz. But that is not always useful.<\\\/p><p data-start=\\\"1664\\\" data-end=\\\"1875\\\">From these points, we can say an RF PCB is a PCB for analog signals with frequency about 30 MHz to 6 GHz. The choice between lumped or distributed model should follow the formula above and the working frequency.<\\\/p><p data-start=\\\"1877\\\" data-end=\\\"2307\\\">Because the substrate dielectric constant is usually high, waves move slower in the board than in air. That makes wavelength shorter on the board. For microstrip and other lines, the substrate must have low dielectric loss. The dielectric constant should not change much over the needed frequency and temperature range. The substrate should have good thermal conductivity and a smooth surface. It must stick well to the conductor.<\\\/p><p data-start=\\\"2309\\\" data-end=\\\"2499\\\">For the metal on the trace we need high conductivity. The metal should have a small temperature coefficient of resistance. It should stick to the substrate well. It should be easy to solder.<\\\/p><h1 data-start=\\\"0\\\" data-end=\\\"43\\\">Principles for choosing RF board material<\\\/h1><h2 data-start=\\\"45\\\" data-end=\\\"85\\\">Role of substrate in microwave PCBs<\\\/h2><p data-start=\\\"86\\\" data-end=\\\"290\\\">A microwave frequency PCB is not only a support for components. It is also a medium for microwave electromagnetic fields. So for RF circuits the best choice is high frequency or microwave grade substrate.<\\\/p><h2 data-start=\\\"292\\\" data-end=\\\"320\\\">Trace impedance control<\\\/h2><p data-start=\\\"321\\\" data-end=\\\"705\\\">On an RF PCB the printed traces must follow normal rules like current capacity. In addition, we must control the trace characteristic impedance. The traces must be matched in impedance. So the PCB process must control trace impedance. The characteristic impedance of a trace depends on the PCB material and its physical parameters. So PCB designers must know the material performance.<\\\/p><h2 data-start=\\\"707\\\" data-end=\\\"747\\\">Material requirements for RF boards<\\\/h2><p data-start=\\\"748\\\" data-end=\\\"1107\\\">RF boards usually need high frequency and high performance. People pick substrate with accurate dielectric constant. The substrate should be stable and have low loss. Also the material must work with production. For example, it must handle high temperature reflow soldering. Our company often uses fr4, TACONIC, and materials from ROGERS for RF base material.<\\\/p><h2 data-start=\\\"1109\\\" data-end=\\\"1134\\\">FR-4 characteristics<\\\/h2><p data-start=\\\"1135\\\" data-end=\\\"1593\\\">fr4 (flame retardant copper clad epoxy glass fabric) has dielectric constant Er tested at 1 GHz as Er = 4.3 \\u00b1 0.2. The glass transition temperature Tg is 135 \\u00b0C. For common boards we use two kinds of plate. One is standard board material. This is low cost and has mature process. The other is UV board, often called yellow board. It has UV-BLOCKING to block ultraviolet. We use it for outer layers. Its performance is a little better than the standard plate.<\\\/p>[caption id=\\\"attachment_2743\\\" align=\\\"alignnone\\\" width=\\\"688\\\"]<img class=\\\"wp-image-2743 size-full\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/fr-4.webp\\\" alt=\\\"fr-4\\\" width=\\\"688\\\" height=\\\"459\\\" \\\/> fr-4[\\\/caption]<h2 data-start=\\\"1595\\\" data-end=\\\"1616\\\">TACONIC material<\\\/h2><p data-start=\\\"1617\\\" data-end=\\\"1696\\\"><a href=\\\"https:\\\/\\\/www.taconic.com\\\/\\\">TACONIC<\\\/a> is a well known brand. It has many specs. Its price is higher than fr4.<\\\/p><h2 data-start=\\\"1698\\\" data-end=\\\"1718\\\">ROGERS material<\\\/h2><p data-start=\\\"1719\\\" data-end=\\\"1962\\\">ROGERS material has high dielectric constant accuracy. It is stable with temperature and has low loss. We use it for high power circuits. The PCB make and process is similar to fr4 so cost of making is low. But the copper foil adhesion is low.<\\\/p><h1 data-start=\\\"4343\\\" data-end=\\\"4360\\\">Substrate table<\\\/h1><div class=\\\"_tableContainer_1rjym_1\\\"><div class=\\\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\\\" tabindex=\\\"-1\\\"><table class=\\\"w-fit min-w-(--thread-content-width)\\\" data-start=\\\"4362\\\" data-end=\\\"4924\\\"><thead data-start=\\\"4362\\\" data-end=\\\"4443\\\"><tr data-start=\\\"4362\\\" data-end=\\\"4443\\\"><th data-start=\\\"4362\\\" data-end=\\\"4376\\\" data-col-size=\\\"sm\\\">Material type<\\\/th><th data-start=\\\"4376\\\" data-end=\\\"4395\\\" data-col-size=\\\"sm\\\">Typical material<\\\/th><th data-start=\\\"4395\\\" data-end=\\\"4409\\\" data-col-size=\\\"sm\\\">Dk (10 GHz)<\\\/th><th data-start=\\\"4409\\\" data-end=\\\"4423\\\" data-col-size=\\\"sm\\\">Df (10 GHz)<\\\/th><th data-start=\\\"4423\\\" data-end=\\\"4443\\\" data-col-size=\\\"md\\\">Features and use<\\\/th><\\\/tr><\\\/thead><tbody data-start=\\\"4469\\\" data-end=\\\"4924\\\"><tr data-start=\\\"4469\\\" data-end=\\\"4622\\\"><td data-start=\\\"4469\\\" data-end=\\\"4493\\\" data-col-size=\\\"sm\\\">Fluoropolymer substrate<\\\/td><td data-start=\\\"4493\\\" data-end=\\\"4526\\\" data-col-size=\\\"sm\\\">PTFE (polytetrafluoroethylene)<\\\/td><td data-start=\\\"4526\\\" data-end=\\\"4536\\\" data-col-size=\\\"sm\\\">2.1\\u20132.3<\\\/td><td data-start=\\\"4536\\\" data-end=\\\"4551\\\" data-col-size=\\\"sm\\\">0.0005\\u20130.001<\\\/td><td data-start=\\\"4551\\\" data-end=\\\"4622\\\" data-col-size=\\\"md\\\">Very low loss. Good for mmWave. Use for 5G base stations and radar.<\\\/td><\\\/tr><tr data-start=\\\"4623\\\" data-end=\\\"4766\\\"><td data-start=\\\"4623\\\" data-end=\\\"4648\\\" data-col-size=\\\"sm\\\">Ceramic filled substrate<\\\/td><td data-start=\\\"4648\\\" data-end=\\\"4671\\\" data-col-size=\\\"sm\\\">Rogers RO4000 series<\\\/td><td data-start=\\\"4671\\\" data-end=\\\"4682\\\" data-col-size=\\\"sm\\\">3.38\\u20134.5<\\\/td><td data-start=\\\"4682\\\" data-end=\\\"4697\\\" data-col-size=\\\"sm\\\">0.0027\\u20130.004<\\\/td><td data-start=\\\"4697\\\" data-end=\\\"4766\\\" data-col-size=\\\"md\\\">Mid cost. Good for microwave. Use for WiFi and Bluetooth modules.<\\\/td><\\\/tr><tr data-start=\\\"4767\\\" data-end=\\\"4924\\\"><td data-start=\\\"4767\\\" data-end=\\\"4789\\\" data-col-size=\\\"sm\\\">Glass fiber substrate<\\\/td><td data-start=\\\"4789\\\" data-end=\\\"4829\\\" data-col-size=\\\"sm\\\">High frequency fr4 (like Isola FR408)<\\\/td><td data-start=\\\"4829\\\" data-end=\\\"4839\\\" data-col-size=\\\"sm\\\">3.9\\u20134.2<\\\/td><td data-start=\\\"4839\\\" data-end=\\\"4852\\\" data-col-size=\\\"sm\\\">0.008\\u20130.01<\\\/td><td data-start=\\\"4852\\\" data-end=\\\"4924\\\" data-col-size=\\\"md\\\">Low cost. Good for mid and low RF. Use for walkie talkies and similar.<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div><h1 data-start=\\\"4926\\\" data-end=\\\"4965\\\">RF issues in PCB design and solutions<\\\/h1><p data-start=\\\"4967\\\" data-end=\\\"5457\\\">In general, for circuits with frequency below microwave (this includes low frequency and low speed digital), careful layout is the first key to success. If you know the rules, you can make a good design. For microstrip and high speed digital circuits at PCB level, two or three PCB versions may be needed to ensure circuit quality. For RF circuits with frequency above microwave, you will need more versions to improve performance. So you will face many challenges during RF circuit design.<\\\/p><p data-start=\\\"5459\\\" data-end=\\\"5503\\\">Below we list common problems and solutions.<\\\/p><h2 data-start=\\\"5505\\\" data-end=\\\"5544\\\">Common problems in RF circuit design<\\\/h2><ol data-start=\\\"5546\\\" data-end=\\\"7663\\\"><li data-start=\\\"5546\\\" data-end=\\\"6328\\\"><p data-start=\\\"5549\\\" data-end=\\\"6328\\\"><b>Interference between digital and analog modules<\\\/b><br data-start=\\\"5596\\\" data-end=\\\"5599\\\" \\\/>When analog RF parts and digital parts work alone, each can work well. But when they mix on the same board and share power, the whole system may become unstable. Digital signals swing between ground and Vcc by more than 3 V. The period can be short, in the nanosecond range. Because the amplitude is large and the switching is fast, digital signals include high frequency components that do not depend on the switching clock. In the analog part, from a tuned radio loop to a receiver, the voltage can be less than 1 \\u03bcV. The difference between the small RF signal and digital noise can be more than 120 dB. If digital signals are not kept away from RF, the weak RF signal can get damaged. The radio may stop working or work badly.<\\\/p><\\\/li><li data-start=\\\"6330\\\" data-end=\\\"6831\\\"><p data-start=\\\"6333\\\" data-end=\\\"6831\\\"><b>Power supply noise interference<\\\/b><br data-start=\\\"6364\\\" data-end=\\\"6367\\\" \\\/>RF circuits are sensitive to noise. They are sensitive to spikes and other high frequency harmonics. A microcontroller will suddenly draw lots of current at each internal clock cycle. Most modern microcontrollers use CMOS. If a microcontroller runs with 1 MHz internal clock, it will draw current at that rate. If we do not have good power decoupling, we will get voltage noise on the power lines. If voltage spikes get to the RF power pins, the RF block may fail.<\\\/p><\\\/li><li data-start=\\\"6833\\\" data-end=\\\"7315\\\"><p data-start=\\\"6836\\\" data-end=\\\"7315\\\"><b>Bad ground design<\\\/b><br data-start=\\\"6853\\\" data-end=\\\"6856\\\" \\\/>If the ground is not well designed for RF, strange results can happen. In digital design, most circuits still work even if ground is not perfect. But in RF, even short ground wires act like inductors. For example, 1 nH of inductance is close to 1 mm in length. From that we can guess that a 10 mm long PCB trace has reactance about 27 ohms. If we have no good ground, many ground traces will be long and the circuit will not keep its designed characteristics.<\\\/p><\\\/li><li data-start=\\\"7317\\\" data-end=\\\"7663\\\"><p data-start=\\\"7320\\\" data-end=\\\"7663\\\"><b>Antenna radiation interfering with other analog circuits<\\\/b><br data-start=\\\"7376\\\" data-end=\\\"7379\\\" \\\/>In PCB layout, there are other analog parts. Many boards have ADCs or DACs. A strong RF signal from a transmitter can reach the ADC input. Any trace can act like an antenna. If the ADC input does not have good handling, the RF can go into its ESD diode and cause ADC offset or errors.<\\\/p><\\\/li><\\\/ol><h2 data-start=\\\"7665\\\" data-end=\\\"7710\\\">RF circuit design principles and solutions<\\\/h2><h3 data-start=\\\"7712\\\" data-end=\\\"7744\\\">1. Definition of RF layout<\\\/h3><p data-start=\\\"7745\\\" data-end=\\\"7791\\\">When you design RF layout, follow these rules.<\\\/p><ol data-start=\\\"7793\\\" data-end=\\\"8272\\\"><li data-start=\\\"7793\\\" data-end=\\\"7952\\\"><p data-start=\\\"7796\\\" data-end=\\\"7952\\\">Keep high power amplifiers (HPAs) and low noise amplifiers (LNAs) as far apart as you can. Put high power transmit parts far from low power receive parts.<\\\/p><\\\/li><li data-start=\\\"7953\\\" data-end=\\\"8096\\\"><p data-start=\\\"7956\\\" data-end=\\\"8096\\\">In high frequency areas on the PCB, have at least one full ground plane below and avoid vias in it. The larger the copper area the better.<\\\/p><\\\/li><li data-start=\\\"8097\\\" data-end=\\\"8153\\\"><p data-start=\\\"8100\\\" data-end=\\\"8153\\\">Circuit and power decoupling are equally important.<\\\/p><\\\/li><li data-start=\\\"8154\\\" data-end=\\\"8196\\\"><p data-start=\\\"8157\\\" data-end=\\\"8196\\\">Place RF outputs away from RF inputs.<\\\/p><\\\/li><li data-start=\\\"8197\\\" data-end=\\\"8272\\\"><p data-start=\\\"8200\\\" data-end=\\\"8272\\\">Put sensitive analog signals far from high speed digital and RF signals.<\\\/p><\\\/li><\\\/ol><p><img class=\\\"alignnone size-full wp-image-2742\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/Definition-of-RF-layout.webp\\\" alt=\\\"Definition of RF layout\\\" width=\\\"600\\\" height=\\\"399\\\" \\\/><\\\/p><h3 data-start=\\\"8274\\\" data-end=\\\"8339\\\">2. Physical partition and electrical partition design rules<\\\/h3><p data-start=\\\"8340\\\" data-end=\\\"8619\\\">Partition means splitting the board by function. You can do physical partition and electrical partition. Physical partition deals with part layout, direction, and shields. Electrical partition deals with power distribution, RF routing, sensitive parts, signals, and ground zones.<\\\/p><p data-start=\\\"8340\\\" data-end=\\\"8619\\\"><img class=\\\"alignnone size-full wp-image-2745\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/RF-partition.webp\\\" alt=\\\"RF partition\\\" width=\\\"640\\\" height=\\\"511\\\" \\\/><\\\/p><h4 data-start=\\\"8621\\\" data-end=\\\"8660\\\">a. Physical partition principles<\\\/h4><p data-start=\\\"8661\\\" data-end=\\\"8890\\\">Parts layout is key for good RF design. A good method is to place parts along the RF path first. Then set their direction. Place inputs away from outputs. Keep high power and low power parts apart. This helps to shorten RF paths.<\\\/p><h4 data-start=\\\"8892\\\" data-end=\\\"8930\\\">b. PCB stackup design principle<\\\/h4><p data-start=\\\"8931\\\" data-end=\\\"9200\\\">A good stackup puts the main ground plane on the layer below the trace layer. Put RF traces on the plane layer. Make vias on RF paths small. This reduces path inductance and reduces cold solder joints on the main ground. Also less RF energy will leak into other layers.<\\\/p><p data-start=\\\"8931\\\" data-end=\\\"9200\\\"><img class=\\\"alignnone size-full wp-image-2744\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/RF-circuit-design.webp\\\" alt=\\\"\\\" width=\\\"640\\\" height=\\\"462\\\" \\\/><\\\/p><h4 data-start=\\\"9202\\\" data-end=\\\"9244\\\">c. RF parts and RF trace principles<\\\/h4><p data-start=\\\"9245\\\" data-end=\\\"9660\\\">In the board space, linear circuits like multistage amplifiers can separate RF zones. But duplexers, mixers, and IF amplifiers often make many RF and IF signals appear near each other. You should take care to lower this coupling. Route RF and IF traces carefully and leave ground space between them. The right RF path is vital for PCB performance. That is why part layout takes most of the time in phone PCB design.<\\\/p><h4 data-start=\\\"9662\\\" data-end=\\\"9702\\\">d. Electrical partition principle<\\\/h4><p data-start=\\\"9703\\\" data-end=\\\"9974\\\">Most power in phone circuits is low DC so you do not need special wide traces. But for power to high power amplifiers you must make wide traces for high current. This keeps voltage drop small. Use many vias to move current from one plane to another to avoid current loss.<\\\/p><p data-start=\\\"9976\\\" data-end=\\\"10253\\\">Power decoupling for power parts is important. If you fail to decouple the power at a high power amplifier pin, many problems can happen. High power noise can radiate across the board. Ground for high power amplifiers is very important. Designers often need a metal shield can.<\\\/p><h4 data-start=\\\"10255\\\" data-end=\\\"10300\\\">e. RF input\\\/output isolation principle<\\\/h4><p data-start=\\\"10301\\\" data-end=\\\"10697\\\">It is very important to keep RF output away from RF input. This applies to amplifiers, buffers, and filters. In worst case, if amplifier or buffer output comes back to its input with the right phase and amplitude, the part can go into self-oscillation. In good case, the circuit will be stable at all temperatures and voltages. In bad case, it will add noise and intermodulation to the RF signal.<\\\/p><h1 data-start=\\\"10699\\\" data-end=\\\"10708\\\">Summary<\\\/h1><p data-start=\\\"10710\\\" data-end=\\\"10978\\\">In short, RF circuits work with distributed parameter lines. They show skin effect and coupling. This makes them different from low frequency and DC circuits. So in RF PCB design you must focus on the points above. If you do, the design will be effective and accurate.<\\\/p><ol data-start=\\\"11035\\\" data-end=\\\"12161\\\"><li data-start=\\\"11164\\\" data-end=\\\"11250\\\"><p data-start=\\\"11167\\\" data-end=\\\"11250\\\">Keep traces short when possible. Short traces reduce loss and unwanted reactance.<\\\/p><\\\/li><li data-start=\\\"11251\\\" data-end=\\\"11384\\\"><p data-start=\\\"11254\\\" data-end=\\\"11384\\\">Use the right substrate for the needed frequency. fr4 is okay for many cases. Use Rogers or PTFE for low loss in high frequency.<\\\/p><\\\/li><li data-start=\\\"11385\\\" data-end=\\\"11496\\\"><p data-start=\\\"11388\\\" data-end=\\\"11496\\\">Control impedance of traces. Use the right width and spacing and stackup. Measure or calculate with tools.<\\\/p><\\\/li><li data-start=\\\"11497\\\" data-end=\\\"11626\\\"><p data-start=\\\"11500\\\" data-end=\\\"11626\\\">Keep digital and RF parts separate. Give each section its own ground return. Use decoupling at power pins close to the part.<\\\/p><\\\/li><li data-start=\\\"11627\\\" data-end=\\\"11703\\\"><p data-start=\\\"11630\\\" data-end=\\\"11703\\\">Use ground planes and small vias for RF return. This lowers inductance.<\\\/p><\\\/li><li data-start=\\\"11704\\\" data-end=\\\"11788\\\"><p data-start=\\\"11707\\\" data-end=\\\"11788\\\">Place filters and shielding near sensitive parts. This lowers unwanted pick up.<\\\/p><\\\/li><li data-start=\\\"11789\\\" data-end=\\\"11922\\\"><p data-start=\\\"11792\\\" data-end=\\\"11922\\\">Test with prototypes. RF usually needs multiple rounds of layout and tune. Small changes can make big effects at high frequency.<\\\/p><\\\/li><li data-start=\\\"11923\\\" data-end=\\\"12058\\\"><p data-start=\\\"11926\\\" data-end=\\\"12058\\\">For antennas, give a clear area and keep metal and other traces away. Antenna matching and tuning often need board space and test.<\\\/p><\\\/li><li data-start=\\\"12059\\\" data-end=\\\"12161\\\"><p data-start=\\\"12063\\\" data-end=\\\"12161\\\">When you make high power traces, make them wide and use many vias to carry current between layers.<\\\/p><\\\/li><\\\/ol><h1 data-start=\\\"12163\\\" data-end=\\\"12198\\\">Basic formulas and rules to check<\\\/h1><ol data-start=\\\"12200\\\" data-end=\\\"12606\\\"><li data-start=\\\"12200\\\" data-end=\\\"12326\\\"><p data-start=\\\"12203\\\" data-end=\\\"12326\\\">Use l\\\/\\u03bb \\u2265 0.05 to see if a trace needs a distributed model. l is geometric length. \\u03bb is working wavelength in the medium.<\\\/p><\\\/li><li data-start=\\\"12327\\\" data-end=\\\"12438\\\"><p data-start=\\\"12330\\\" data-end=\\\"12438\\\">For quick inductance sense, 1 nH is about 1 mm of trace. Use this to check if long grounds add inductance.<\\\/p><\\\/li><li data-start=\\\"12439\\\" data-end=\\\"12606\\\"><p data-start=\\\"12442\\\" data-end=\\\"12606\\\">For impedance control, know the stackup, trace width, dielectric constant, and distance to plane. Use a field solver or impedance calculator to get accurate values.<\\\/p><\\\/li><\\\/ol>\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"351cd37\"}]},\"elements\":[],\"widgetType\":\"text-editor\"}],\"isInner\":false},{\"id\":\"vdmvn40\",\"elType\":\"section\",\"settings\":{\"gap\":\"no\",\"content_position\":\"top\",\"background_background\":\"classic\",\"background_color\":\"#FFFFFF00\",\"background_position\":\"bottom center\",\"background_attachment\":\"scroll\",\"background_repeat\":\"no-repeat\",\"background_size\":\"cover\",\"background_size_mobile\":\"cover\",\"background_overlay_background\":\"classic\",\"background_overlay_color_b\":\"rgba(255,255,255,0)\",\"background_overlay_opacity\":{\"unit\":\"px\",\"size\":\"\",\"sizes\":[]},\"padding\":{\"unit\":\"px\",\"top\":\"0\",\"right\":\"0\",\"bottom\":\"0\",\"left\":\"0\",\"isLinked\":false},\"padding_tablet\":{\"unit\":\"px\",\"top\":\"80\",\"right\":\"40\",\"bottom\":\"80\",\"left\":\"40\",\"isLinked\":false},\"padding_mobile\":{\"unit\":\"px\",\"top\":\"50\",\"right\":\"25\",\"bottom\":\"50\",\"left\":\"25\",\"isLinked\":false},\"content_width\":{\"unit\":\"px\",\"size\":800,\"sizes\":[]},\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"d7a4f88\"}],\"margin\":{\"unit\":\"px\",\"top\":\"0\",\"right\":0,\"bottom\":\"0\",\"left\":0,\"isLinked\":true}},\"elements\":[{\"id\":\"7882748\",\"elType\":\"column\",\"settings\":{\"_column_size\":100,\"_inline_size\":null,\"padding\":{\"unit\":\"px\",\"top\":\"0\",\"right\":\"0\",\"bottom\":\"0\",\"left\":\"0\",\"isLinked\":true},\"space_between_widgets\":40,\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"051b026\"}]},\"elements\":[{\"id\":\"9fc6712\",\"elType\":\"widget\",\"settings\":{\"title\":\"Frequently Asked Questions\",\"align\":\"center\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"a4e53df\"}]},\"elements\":[],\"widgetType\":\"heading\"},{\"id\":\"631b990\",\"elType\":\"widget\",\"settings\":{\"tabs\":[{\"tab_title\":\"What is an RF PCB?\",\"tab_content\":\"<p>An RF (radio-frequency) PCB is designed to carry RF and microwave signals (hundreds of MHz up to many GHz). It uses controlled materials, stackups and layout rules to minimize loss and preserve signal integrity.<\\\/p>\",\"_id\":\"1f7b19c\"},{\"_id\":\"ef631eb\",\"tab_title\":\"Which substrate materials are typically used for RF PCBs?\",\"tab_content\":\"<p>Common choices are PTFE-based laminates and engineered materials (Rogers, Taconic, etc.) for low loss and stable dielectric properties; in some lower-frequency or cost-sensitive designs, high-grade FR-4 variants may be used.<\\\/p>\"},{\"_id\":\"0d9461c\",\"tab_title\":\"Why not always use FR-4 for RF designs?\",\"tab_content\":\"<p>Standard FR-4 has higher dielectric loss and less stable Dk at GHz frequencies, which increases attenuation and impedance variability\\u2014so for precision RF work PTFE\\\/Rogers-class laminates are usually preferred.<\\\/p>\"},{\"_id\":\"2ece67a\",\"tab_title\":\"Are via stubs a problem for RF signals?\",\"tab_content\":\"<p>Yes\\u2014via stubs act like short unterminated transmission lines and cause reflections. 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class=\\\"elementor-element elementor-element-553a1cd e-flex e-con-boxed e-con e-parent\\\" data-id=\\\"553a1cd\\\" data-element_type=\\\"container\\\">\\n\\t\\t\\t\\t\\t<div class=\\\"e-con-inner\\\">\\n\\t\\t[elementor-element k=\\\"0e46bd9387093ca73b9000e38f18cce4\\\" data=\\\"{"id":"1e7d27b","elType":"widget","settings":{"editor":"<p data-start=\"10\" data-end=\"220\">RF PCB is a type of printed circuit board (PCB) made for carrying and handling radio frequency signals. These signals are high frequency. They usually have frequency equal to or above 300 kHz and up to 300 GHz.<\/p><p data-start=\"10\" data-end=\"220\"><img class=\"alignnone size-full wp-image-2746\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-PCB.webp\" alt=\"RF PCB\" width=\"633\" height=\"500\" \/><\/p><p data-start=\"10\" data-end=\"220\">\u00a0<\/p><p data-start=\"222\" data-end=\"870\">Radio frequency, or RF, is a name for a group of electromagnetic waves. People use this name when the waves can work for radio communication. The range of frequency for RF is not always the same in different books. Some books say RF is from 30 MHz to 3 GHz. Some say it is from 300 MHz to 40 GHz. These ranges can overlap with the range called microwave. Some other books use a different way to split the spectrum. They say waves with wavelength from 1 megameter to 1 meter are in a group. That gives frequencies from 30 Hz to 300 MHz. The line between RF and microwave is not very clear. The line can change as parts and design methods get better.<\/p><h1 data-start=\"872\" data-end=\"902\">RF PCB and its main features<\/h1><p data-start=\"904\" data-end=\"1662\">When we design a PCB for RF use, we must think about how transmission lines behave. For a wire or trace on a PCB, we can model it in two ways. One is the lumped element model. The other is the distributed parameter model. A common rule is this. If the geometric length l divided by the wavelength \u03bb is equal to or larger than 0.05, then we use the distributed model. In this note, an RF link means a circuit where the transmission line needs the distributed model. In practice, PCB trace length is rarely longer than 50 cm. So we can start from analog signals at 30 MHz. Signals above 3 GHz are often called microwave. For production limits where element spacing can be 0.5 mm, people sometimes set the top frequency to 30 GHz. But that is not always useful.<\/p><p data-start=\"1664\" data-end=\"1875\">From these points, we can say an RF PCB is a PCB for analog signals with frequency about 30 MHz to 6 GHz. The choice between lumped or distributed model should follow the formula above and the working frequency.<\/p><p data-start=\"1877\" data-end=\"2307\">Because the substrate dielectric constant is usually high, waves move slower in the board than in air. That makes wavelength shorter on the board. For microstrip and other lines, the substrate must have low dielectric loss. The dielectric constant should not change much over the needed frequency and temperature range. The substrate should have good thermal conductivity and a smooth surface. It must stick well to the conductor.<\/p><p data-start=\"2309\" data-end=\"2499\">For the metal on the trace we need high conductivity. The metal should have a small temperature coefficient of resistance. It should stick to the substrate well. It should be easy to solder.<\/p><h1 data-start=\"0\" data-end=\"43\">Principles for choosing RF board material<\/h1><h2 data-start=\"45\" data-end=\"85\">Role of substrate in microwave PCBs<\/h2><p data-start=\"86\" data-end=\"290\">A microwave frequency PCB is not only a support for components. It is also a medium for microwave electromagnetic fields. So for RF circuits the best choice is high frequency or microwave grade substrate.<\/p><h2 data-start=\"292\" data-end=\"320\">Trace impedance control<\/h2><p data-start=\"321\" data-end=\"705\">On an RF PCB the printed traces must follow normal rules like current capacity. In addition, we must control the trace characteristic impedance. The traces must be matched in impedance. So the PCB process must control trace impedance. The characteristic impedance of a trace depends on the PCB material and its physical parameters. So PCB designers must know the material performance.<\/p><h2 data-start=\"707\" data-end=\"747\">Material requirements for RF boards<\/h2><p data-start=\"748\" data-end=\"1107\">RF boards usually need high frequency and high performance. People pick substrate with accurate dielectric constant. The substrate should be stable and have low loss. Also the material must work with production. For example, it must handle high temperature reflow soldering. Our company often uses fr4, TACONIC, and materials from ROGERS for RF base material.<\/p><h2 data-start=\"1109\" data-end=\"1134\">FR-4 characteristics<\/h2><p data-start=\"1135\" data-end=\"1593\">fr4 (flame retardant copper clad epoxy glass fabric) has dielectric constant Er tested at 1 GHz as Er = 4.3 \u00b1 0.2. The glass transition temperature Tg is 135 \u00b0C. For common boards we use two kinds of plate. One is standard board material. This is low cost and has mature process. The other is UV board, often called yellow board. It has UV-BLOCKING to block ultraviolet. We use it for outer layers. Its performance is a little better than the standard plate.<\/p>[caption id=\"attachment_2743\" align=\"alignnone\" width=\"688\"]<img class=\"wp-image-2743 size-full\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/fr-4.webp\" alt=\"fr-4\" width=\"688\" height=\"459\" \/> fr-4[\/caption]<h2 data-start=\"1595\" data-end=\"1616\">TACONIC material<\/h2><p data-start=\"1617\" data-end=\"1696\"><a href=\"https:\/\/www.taconic.com\/\">TACONIC<\/a> is a well known brand. It has many specs. Its price is higher than fr4.<\/p><h2 data-start=\"1698\" data-end=\"1718\">ROGERS material<\/h2><p data-start=\"1719\" data-end=\"1962\">ROGERS material has high dielectric constant accuracy. It is stable with temperature and has low loss. We use it for high power circuits. The PCB make and process is similar to fr4 so cost of making is low. But the copper foil adhesion is low.<\/p><h1 data-start=\"4343\" data-end=\"4360\">Substrate table<\/h1><div class=\"_tableContainer_1rjym_1\"><div class=\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"4362\" data-end=\"4924\"><thead data-start=\"4362\" data-end=\"4443\"><tr data-start=\"4362\" data-end=\"4443\"><th data-start=\"4362\" data-end=\"4376\" data-col-size=\"sm\">Material type<\/th><th data-start=\"4376\" data-end=\"4395\" data-col-size=\"sm\">Typical material<\/th><th data-start=\"4395\" data-end=\"4409\" data-col-size=\"sm\">Dk (10 GHz)<\/th><th data-start=\"4409\" data-end=\"4423\" data-col-size=\"sm\">Df (10 GHz)<\/th><th data-start=\"4423\" data-end=\"4443\" data-col-size=\"md\">Features and use<\/th><\/tr><\/thead><tbody data-start=\"4469\" data-end=\"4924\"><tr data-start=\"4469\" data-end=\"4622\"><td data-start=\"4469\" data-end=\"4493\" data-col-size=\"sm\">Fluoropolymer substrate<\/td><td data-start=\"4493\" data-end=\"4526\" data-col-size=\"sm\">PTFE (polytetrafluoroethylene)<\/td><td data-start=\"4526\" data-end=\"4536\" data-col-size=\"sm\">2.1\u20132.3<\/td><td data-start=\"4536\" data-end=\"4551\" data-col-size=\"sm\">0.0005\u20130.001<\/td><td data-start=\"4551\" data-end=\"4622\" data-col-size=\"md\">Very low loss. Good for mmWave. Use for 5G base stations and radar.<\/td><\/tr><tr data-start=\"4623\" data-end=\"4766\"><td data-start=\"4623\" data-end=\"4648\" data-col-size=\"sm\">Ceramic filled substrate<\/td><td data-start=\"4648\" data-end=\"4671\" data-col-size=\"sm\">Rogers RO4000 series<\/td><td data-start=\"4671\" data-end=\"4682\" data-col-size=\"sm\">3.38\u20134.5<\/td><td data-start=\"4682\" data-end=\"4697\" data-col-size=\"sm\">0.0027\u20130.004<\/td><td data-start=\"4697\" data-end=\"4766\" data-col-size=\"md\">Mid cost. Good for microwave. Use for WiFi and Bluetooth modules.<\/td><\/tr><tr data-start=\"4767\" data-end=\"4924\"><td data-start=\"4767\" data-end=\"4789\" data-col-size=\"sm\">Glass fiber substrate<\/td><td data-start=\"4789\" data-end=\"4829\" data-col-size=\"sm\">High frequency fr4 (like Isola FR408)<\/td><td data-start=\"4829\" data-end=\"4839\" data-col-size=\"sm\">3.9\u20134.2<\/td><td data-start=\"4839\" data-end=\"4852\" data-col-size=\"sm\">0.008\u20130.01<\/td><td data-start=\"4852\" data-end=\"4924\" data-col-size=\"md\">Low cost. Good for mid and low RF. Use for walkie talkies and similar.<\/td><\/tr><\/tbody><\/table><\/div><\/div><h1 data-start=\"4926\" data-end=\"4965\">RF issues in PCB design and solutions<\/h1><p data-start=\"4967\" data-end=\"5457\">In general, for circuits with frequency below microwave (this includes low frequency and low speed digital), careful layout is the first key to success. If you know the rules, you can make a good design. For microstrip and high speed digital circuits at PCB level, two or three PCB versions may be needed to ensure circuit quality. For RF circuits with frequency above microwave, you will need more versions to improve performance. So you will face many challenges during RF circuit design.<\/p><p data-start=\"5459\" data-end=\"5503\">Below we list common problems and solutions.<\/p><h2 data-start=\"5505\" data-end=\"5544\">Common problems in RF circuit design<\/h2><ol data-start=\"5546\" data-end=\"7663\"><li data-start=\"5546\" data-end=\"6328\"><p data-start=\"5549\" data-end=\"6328\"><b>Interference between digital and analog modules<\/b><br data-start=\"5596\" data-end=\"5599\" \/>When analog RF parts and digital parts work alone, each can work well. But when they mix on the same board and share power, the whole system may become unstable. Digital signals swing between ground and Vcc by more than 3 V. The period can be short, in the nanosecond range. Because the amplitude is large and the switching is fast, digital signals include high frequency components that do not depend on the switching clock. In the analog part, from a tuned radio loop to a receiver, the voltage can be less than 1 \u03bcV. The difference between the small RF signal and digital noise can be more than 120 dB. If digital signals are not kept away from RF, the weak RF signal can get damaged. The radio may stop working or work badly.<\/p><\/li><li data-start=\"6330\" data-end=\"6831\"><p data-start=\"6333\" data-end=\"6831\"><b>Power supply noise interference<\/b><br data-start=\"6364\" data-end=\"6367\" \/>RF circuits are sensitive to noise. They are sensitive to spikes and other high frequency harmonics. A microcontroller will suddenly draw lots of current at each internal clock cycle. Most modern microcontrollers use CMOS. If a microcontroller runs with 1 MHz internal clock, it will draw current at that rate. If we do not have good power decoupling, we will get voltage noise on the power lines. If voltage spikes get to the RF power pins, the RF block may fail.<\/p><\/li><li data-start=\"6833\" data-end=\"7315\"><p data-start=\"6836\" data-end=\"7315\"><b>Bad ground design<\/b><br data-start=\"6853\" data-end=\"6856\" \/>If the ground is not well designed for RF, strange results can happen. In digital design, most circuits still work even if ground is not perfect. But in RF, even short ground wires act like inductors. For example, 1 nH of inductance is close to 1 mm in length. From that we can guess that a 10 mm long PCB trace has reactance about 27 ohms. If we have no good ground, many ground traces will be long and the circuit will not keep its designed characteristics.<\/p><\/li><li data-start=\"7317\" data-end=\"7663\"><p data-start=\"7320\" data-end=\"7663\"><b>Antenna radiation interfering with other analog circuits<\/b><br data-start=\"7376\" data-end=\"7379\" \/>In PCB layout, there are other analog parts. Many boards have ADCs or DACs. A strong RF signal from a transmitter can reach the ADC input. Any trace can act like an antenna. If the ADC input does not have good handling, the RF can go into its ESD diode and cause ADC offset or errors.<\/p><\/li><\/ol><h2 data-start=\"7665\" data-end=\"7710\">RF circuit design principles and solutions<\/h2><h3 data-start=\"7712\" data-end=\"7744\">1. Definition of RF layout<\/h3><p data-start=\"7745\" data-end=\"7791\">When you design RF layout, follow these rules.<\/p><ol data-start=\"7793\" data-end=\"8272\"><li data-start=\"7793\" data-end=\"7952\"><p data-start=\"7796\" data-end=\"7952\">Keep high power amplifiers (HPAs) and low noise amplifiers (LNAs) as far apart as you can. Put high power transmit parts far from low power receive parts.<\/p><\/li><li data-start=\"7953\" data-end=\"8096\"><p data-start=\"7956\" data-end=\"8096\">In high frequency areas on the PCB, have at least one full ground plane below and avoid vias in it. The larger the copper area the better.<\/p><\/li><li data-start=\"8097\" data-end=\"8153\"><p data-start=\"8100\" data-end=\"8153\">Circuit and power decoupling are equally important.<\/p><\/li><li data-start=\"8154\" data-end=\"8196\"><p data-start=\"8157\" data-end=\"8196\">Place RF outputs away from RF inputs.<\/p><\/li><li data-start=\"8197\" data-end=\"8272\"><p data-start=\"8200\" data-end=\"8272\">Put sensitive analog signals far from high speed digital and RF signals.<\/p><\/li><\/ol><p><img class=\"alignnone size-full wp-image-2742\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Definition-of-RF-layout.webp\" alt=\"Definition of RF layout\" width=\"600\" height=\"399\" \/><\/p><h3 data-start=\"8274\" data-end=\"8339\">2. Physical partition and electrical partition design rules<\/h3><p data-start=\"8340\" data-end=\"8619\">Partition means splitting the board by function. You can do physical partition and electrical partition. Physical partition deals with part layout, direction, and shields. Electrical partition deals with power distribution, RF routing, sensitive parts, signals, and ground zones.<\/p><p data-start=\"8340\" data-end=\"8619\"><img class=\"alignnone size-full wp-image-2745\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-partition.webp\" alt=\"RF partition\" width=\"640\" height=\"511\" \/><\/p><h4 data-start=\"8621\" data-end=\"8660\">a. Physical partition principles<\/h4><p data-start=\"8661\" data-end=\"8890\">Parts layout is key for good RF design. A good method is to place parts along the RF path first. Then set their direction. Place inputs away from outputs. Keep high power and low power parts apart. This helps to shorten RF paths.<\/p><h4 data-start=\"8892\" data-end=\"8930\">b. PCB stackup design principle<\/h4><p data-start=\"8931\" data-end=\"9200\">A good stackup puts the main ground plane on the layer below the trace layer. Put RF traces on the plane layer. Make vias on RF paths small. This reduces path inductance and reduces cold solder joints on the main ground. Also less RF energy will leak into other layers.<\/p><p data-start=\"8931\" data-end=\"9200\"><img class=\"alignnone size-full wp-image-2744\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-circuit-design.webp\" alt=\"\" width=\"640\" height=\"462\" \/><\/p><h4 data-start=\"9202\" data-end=\"9244\">c. RF parts and RF trace principles<\/h4><p data-start=\"9245\" data-end=\"9660\">In the board space, linear circuits like multistage amplifiers can separate RF zones. But duplexers, mixers, and IF amplifiers often make many RF and IF signals appear near each other. You should take care to lower this coupling. Route RF and IF traces carefully and leave ground space between them. The right RF path is vital for PCB performance. That is why part layout takes most of the time in phone PCB design.<\/p><h4 data-start=\"9662\" data-end=\"9702\">d. Electrical partition principle<\/h4><p data-start=\"9703\" data-end=\"9974\">Most power in phone circuits is low DC so you do not need special wide traces. But for power to high power amplifiers you must make wide traces for high current. This keeps voltage drop small. Use many vias to move current from one plane to another to avoid current loss.<\/p><p data-start=\"9976\" data-end=\"10253\">Power decoupling for power parts is important. If you fail to decouple the power at a high power amplifier pin, many problems can happen. High power noise can radiate across the board. Ground for high power amplifiers is very important. Designers often need a metal shield can.<\/p><h4 data-start=\"10255\" data-end=\"10300\">e. RF input\/output isolation principle<\/h4><p data-start=\"10301\" data-end=\"10697\">It is very important to keep RF output away from RF input. This applies to amplifiers, buffers, and filters. In worst case, if amplifier or buffer output comes back to its input with the right phase and amplitude, the part can go into self-oscillation. In good case, the circuit will be stable at all temperatures and voltages. In bad case, it will add noise and intermodulation to the RF signal.<\/p><h1 data-start=\"10699\" data-end=\"10708\">Summary<\/h1><p data-start=\"10710\" data-end=\"10978\">In short, RF circuits work with distributed parameter lines. They show skin effect and coupling. This makes them different from low frequency and DC circuits. So in RF PCB design you must focus on the points above. If you do, the design will be effective and accurate.<\/p><ol data-start=\"11035\" data-end=\"12161\"><li data-start=\"11164\" data-end=\"11250\"><p data-start=\"11167\" data-end=\"11250\">Keep traces short when possible. Short traces reduce loss and unwanted reactance.<\/p><\/li><li data-start=\"11251\" data-end=\"11384\"><p data-start=\"11254\" data-end=\"11384\">Use the right substrate for the needed frequency. fr4 is okay for many cases. Use Rogers or PTFE for low loss in high frequency.<\/p><\/li><li data-start=\"11385\" data-end=\"11496\"><p data-start=\"11388\" data-end=\"11496\">Control impedance of traces. Use the right width and spacing and stackup. Measure or calculate with tools.<\/p><\/li><li data-start=\"11497\" data-end=\"11626\"><p data-start=\"11500\" data-end=\"11626\">Keep digital and RF parts separate. Give each section its own ground return. Use decoupling at power pins close to the part.<\/p><\/li><li data-start=\"11627\" data-end=\"11703\"><p data-start=\"11630\" data-end=\"11703\">Use ground planes and small vias for RF return. This lowers inductance.<\/p><\/li><li data-start=\"11704\" data-end=\"11788\"><p data-start=\"11707\" data-end=\"11788\">Place filters and shielding near sensitive parts. This lowers unwanted pick up.<\/p><\/li><li data-start=\"11789\" data-end=\"11922\"><p data-start=\"11792\" data-end=\"11922\">Test with prototypes. RF usually needs multiple rounds of layout and tune. Small changes can make big effects at high frequency.<\/p><\/li><li data-start=\"11923\" data-end=\"12058\"><p data-start=\"11926\" data-end=\"12058\">For antennas, give a clear area and keep metal and other traces away. Antenna matching and tuning often need board space and test.<\/p><\/li><li data-start=\"12059\" data-end=\"12161\"><p data-start=\"12063\" data-end=\"12161\">When you make high power traces, make them wide and use many vias to carry current between layers.<\/p><\/li><\/ol><h1 data-start=\"12163\" data-end=\"12198\">Basic formulas and rules to check<\/h1><ol data-start=\"12200\" data-end=\"12606\"><li data-start=\"12200\" data-end=\"12326\"><p data-start=\"12203\" data-end=\"12326\">Use l\/\u03bb \u2265 0.05 to see if a trace needs a distributed model. l is geometric length. \u03bb is working wavelength in the medium.<\/p><\/li><li data-start=\"12327\" data-end=\"12438\"><p data-start=\"12330\" data-end=\"12438\">For quick inductance sense, 1 nH is about 1 mm of trace. Use this to check if long grounds add inductance.<\/p><\/li><li data-start=\"12439\" data-end=\"12606\"><p data-start=\"12442\" data-end=\"12606\">For impedance control, know the stackup, trace width, dielectric constant, and distance to plane. Use a field solver or impedance calculator to get accurate values.<\/p><\/li><\/ol>","display_condition_list":[{"display_condition_login_status":"subscriber","_id":"351cd37"}]},"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-vdmvn40 elementor-section-content-top elementor-section-boxed elementor-section-height-default elementor-section-height-default\\\" data-id=\\\"vdmvn40\\\" data-element_type=\\\"section\\\" data-settings=\\\"{&quot;background_background&quot;:&quot;classic&quot;}\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-background-overlay\\\"><\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-container elementor-column-gap-no\\\">\\n\\t\\t\\t\\t\\t<div class=\\\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7882748\\\" data-id=\\\"7882748\\\" data-element_type=\\\"column\\\">\\n\\t\\t\\t<div class=\\\"elementor-widget-wrap elementor-element-populated\\\">\\n\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-element elementor-element-9fc6712 elementor-widget elementor-widget-heading\\\" data-id=\\\"9fc6712\\\" data-element_type=\\\"widget\\\" data-widget_type=\\\"heading.default\\\">\\n\\t\\t\\t\\t<div class=\\\"elementor-widget-container\\\">\\n\\t\\t\\t\\t\\t<h2 class=\\\"elementor-heading-title elementor-size-default\\\">Frequently Asked Questions<\\\/h2>\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<div class=\\\"elementor-element elementor-element-631b990 elementor-widget elementor-widget-accordion\\\" data-id=\\\"631b990\\\" data-element_type=\\\"widget\\\" data-widget_type=\\\"accordion.default\\\">\\n\\t\\t\\t\\t<div class=\\\"elementor-widget-container\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1031\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"1\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1031\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">What is an RF PCB?<\\\/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>An RF (radio-frequency) PCB is designed to carry RF and microwave signals (hundreds of MHz up to many GHz). It uses controlled materials, stackups and layout rules to minimize loss and preserve signal integrity.<\\\/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\\\">Which substrate materials are typically used for RF PCBs?<\\\/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>Common choices are PTFE-based laminates and engineered materials (Rogers, Taconic, etc.) for low loss and stable dielectric properties; in some lower-frequency or cost-sensitive designs, high-grade FR-4 variants may be used.<\\\/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\\\">Why not always use FR-4 for RF designs?<\\\/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>Standard FR-4 has higher dielectric loss and less stable Dk at GHz frequencies, which increases attenuation and impedance variability\\u2014so for precision RF work PTFE\\\/Rogers-class laminates are usually preferred.<\\\/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\\\">Are via stubs a problem for RF signals?<\\\/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>Yes\\u2014via stubs act like short unterminated transmission lines and cause reflections. Common mitigations include back-drilling, buried\\\/stacked vias, and careful via placement.<\\\/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\\\">What tests validate RF PCB performance?<\\\/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>Common tests: VNA S-parameter (insertion\\\/return loss), TDR\\\/impedance checks, and thermal\\\/aging tests to verify Dk stability and dimensional behavior.<\\\/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-1036\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"6\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1036\\\" 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 should I provide to a manufacturer for an accurate RF quote?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1036\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"6\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1036\\\"><p>Supply Gerbers\\\/ODB++, target impedance values, exact layer stackup, dielectric choices (or Dk\\\/Df targets), BGA\\\/pitch info, via requirements (backdrill\\\/via-in-pad), and any special routing or assembly notes. Early DFM review speeds up production and reduces risk.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/section>\\n\\t\\t\",\"scripts\":[],\"styles\":[]}}"],"_uag_css_file_name":["uag-css-2145.css"],"_uag_js_file_name":["uag-js-2145.js"]},"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"Philifast","author_link":"https:\/\/flj-pcb.com\/bs\/author\/2475017442jygmail-com\/"},"uagb_comment_info":0,"uagb_excerpt":"RF PCB is a type of printed circuit board (PCB) made for carrying and handling radio frequency signals. These signals [&hellip;]","_links":{"self":[{"href":"https:\/\/flj-pcb.com\/bs\/wp-json\/wp\/v2\/pages\/2145","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/flj-pcb.com\/bs\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/flj-pcb.com\/bs\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/bs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/bs\/wp-json\/wp\/v2\/comments?post=2145"}],"version-history":[{"count":29,"href":"https:\/\/flj-pcb.com\/bs\/wp-json\/wp\/v2\/pages\/2145\/revisions"}],"predecessor-version":[{"id":3362,"href":"https:\/\/flj-pcb.com\/bs\/wp-json\/wp\/v2\/pages\/2145\/revisions\/3362"}],"up":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/bs\/wp-json\/wp\/v2\/pages\/1898"}],"wp:attachment":[{"href":"https:\/\/flj-pcb.com\/bs\/wp-json\/wp\/v2\/media?parent=2145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}