{"id":1909,"date":"2025-08-25T02:07:24","date_gmt":"2025-08-25T02:07:24","guid":{"rendered":"https:\/\/flj-pcb.com\/?page_id=1909"},"modified":"2025-09-25T08:26:33","modified_gmt":"2025-09-25T08:26:33","slug":"high-frequency-pcb","status":"publish","type":"page","link":"https:\/\/flj-pcb.com\/de_at\/pcb-manufacturer\/high-frequency-pcb\/","title":{"rendered":"Hochfrequenz-Leiterplatten: Geringer Verlust, hohe Geschwindigkeit"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"1909\" class=\"elementor elementor-1909\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2fe9c4e e-flex e-con-boxed e-con e-parent\" data-id=\"2fe9c4e\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f058cdb elementor-widget elementor-widget-text-editor\" data-id=\"f058cdb\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 data-start=\"315\" data-end=\"345\">Was ist eine Hochfrequenz-Leiterplatte?<\/h2><p data-start=\"347\" data-end=\"753\">A<a href=\"https:\/\/en.wikipedia.org\/wiki\/Printed_circuit_board#High_frequency_PCBs\" target=\"_blank\" rel=\"noopener\"> Hochfrequenz-Leiterplatte<\/a> ist eine spezielle Leiterplatte (PCB), die f\u00fcr Signale mit hohen elektromagnetischen Frequenzen verwendet wird. Diese Leiterplatten sind f\u00fcr Radiofrequenzen \u00fcber etwa 300 MHz (Wellenl\u00e4nge &lt; 1 m) und f\u00fcr Mikrowellenfrequenzen \u00fcber etwa 3 GHz (Wellenl\u00e4nge &lt; 0,1 m) bestimmt. Sie werden auf mikrowellengeeigneten kupferkaschierten Laminaten hergestellt. Bei der Herstellung k\u00f6nnen einige Standardschritte f\u00fcr starre Leiterplatten oder spezielle Verfahren f\u00fcr diese Materialien angewandt werden.<\/p><p data-start=\"347\" data-end=\"753\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-2728\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/High-Frequency-PCB.webp\" alt=\"High-Frequency PCB\" width=\"600\" height=\"372\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/High-Frequency-PCB.webp 600w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/High-Frequency-PCB-300x186.webp 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p><p data-start=\"755\" data-end=\"1165\">Mit dem raschen technischen Fortschritt arbeiten immer mehr Ger\u00e4te im Mikrowellenbereich (&gt;1 GHz) und sogar im Millimeterwellenbereich (&gt;30 GHz). Das bedeutet, dass die Frequenzen steigen und der Materialbedarf zunimmt. Die Basismaterialien m\u00fcssen sehr gute elektrische Eigenschaften und eine gute chemische Stabilit\u00e4t aufweisen. Wenn die Signalfrequenz steigt, muss der Materialverlust sehr gering bleiben. Mit der Einf\u00fchrung von 5G werden Hochfrequenzmaterialien immer wichtiger.<\/p><hr data-start=\"1167\" data-end=\"1170\" \/><h1 data-start=\"1172\" data-end=\"1207\">Vorteile von Hochfrequenz-PCBs<\/h1><p data-start=\"1209\" data-end=\"1430\"><strong data-start=\"1209\" data-end=\"1231\">1. Hohe Effizienz<\/strong><br data-start=\"1231\" data-end=\"1234\" \/>Materialien mit niedriger Dielektrizit\u00e4tskonstante verursachen geringe Verluste. Mit moderner Induktionserw\u00e4rmung und anderen Methoden k\u00f6nnen die Ziele erreicht und eine hohe Effizienz beibehalten werden. Diese Platten tragen auch zur Abfallvermeidung bei und entsprechen den Umweltzielen.<\/p><p data-start=\"1432\" data-end=\"1677\"><strong data-start=\"1432\" data-end=\"1449\">2. Hohe Geschwindigkeit<\/strong><br data-start=\"1449\" data-end=\"1452\" \/>Die Signalgeschwindigkeit ist umgekehrt proportional zur Quadratwurzel der Dielektrizit\u00e4tskonstante. Eine niedrigere Dielektrizit\u00e4tskonstante bedeutet eine schnellere \u00dcbertragung. Spezielle Materialien halten die Dielektrizit\u00e4tskonstante niedrig und stabil. Dies f\u00f6rdert die Signal\u00fcbertragung.<\/p><p data-start=\"1679\" data-end=\"1970\"><strong data-start=\"1679\" data-end=\"1723\">3. Gute Kontrolle der Erhitzung oder Verarbeitung<\/strong><br data-start=\"1723\" data-end=\"1726\" \/>Hochfrequenzplatten werden in vielen Bereichen eingesetzt, in denen eine pr\u00e4zise Erw\u00e4rmung von Metallteilen erforderlich ist. Sie k\u00f6nnen steuern, wie tief oder wo erw\u00e4rmt werden soll. Sie k\u00f6nnen sich auf die Oberfl\u00e4chen- oder Tiefenerw\u00e4rmung konzentrieren. Sie k\u00f6nnen gezielt oder fl\u00e4chig erw\u00e4rmen. Die Platte erm\u00f6glicht eine feine Steuerung.<\/p><p data-start=\"1972\" data-end=\"2316\"><strong data-start=\"1972\" data-end=\"1996\">4. Lange Lebensdauer<\/strong><br data-start=\"1996\" data-end=\"1999\" \/>Die Dielektrizit\u00e4tskonstante und das dielektrische Material h\u00e4ngen von der Umgebung ab. In feuchten Gebieten schadet Feuchtigkeit den Platten. Hochfrequenzplatinen aus Materialien mit geringer Wasseraufnahme sind dagegen resistent. Sie widerstehen chemischer Korrosion, Feuchtigkeit und gro\u00dfer Hitze und haben eine hohe Sch\u00e4lfestigkeit. Dank dieser Eigenschaften sind sie auch in schwierigen Umgebungen robust.<\/p><hr data-start=\"2318\" data-end=\"2321\" \/><h1 data-start=\"2323\" data-end=\"2375\">G\u00e4ngige Hochfrequenz- und Hochgeschwindigkeits-Leiterplattenmaterialien<\/h1><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"2377\" data-end=\"2727\"><thead data-start=\"2377\" data-end=\"2419\"><tr data-start=\"2377\" data-end=\"2419\"><th data-start=\"2377\" data-end=\"2393\" data-col-size=\"sm\">Marke\/Hersteller<\/th><th data-start=\"2393\" data-end=\"2419\" data-col-size=\"md\">Typische Serien \/ Typen<\/th><\/tr><\/thead><tbody data-start=\"2430\" data-end=\"2727\"><tr data-start=\"2430\" data-end=\"2473\"><td data-start=\"2430\" data-end=\"2439\" data-col-size=\"sm\">Rogers<\/td><td data-col-size=\"md\" data-start=\"2439\" data-end=\"2473\">RO4003, RO3003, RO4350, RO5880<\/td><\/tr><tr data-start=\"2474\" data-end=\"2537\"><td data-start=\"2474\" data-end=\"2509\" data-col-size=\"sm\">TUC (Marke Taiyao \/ TaYa oder TUC)<\/td><td data-col-size=\"md\" data-start=\"2509\" data-end=\"2537\">TUC862, 872SLK, 883, 933<\/td><\/tr><tr data-start=\"2538\" data-end=\"2574\"><td data-start=\"2538\" data-end=\"2550\" data-col-size=\"sm\">Panasonic<\/td><td data-col-size=\"md\" data-start=\"2550\" data-end=\"2574\">Megtron 4, Megtron 6<\/td><\/tr><tr data-start=\"2575\" data-end=\"2608\"><td data-start=\"2575\" data-end=\"2583\" data-col-size=\"sm\">Isola<\/td><td data-col-size=\"md\" data-start=\"2583\" data-end=\"2608\">FR408HR, IS620, IS680<\/td><\/tr><tr data-start=\"2609\" data-end=\"2643\"><td data-start=\"2609\" data-end=\"2617\" data-col-size=\"sm\">Nelco<\/td><td data-start=\"2617\" data-end=\"2643\" data-col-size=\"md\">N4000-13, N4000-13EPSI<\/td><\/tr><tr data-start=\"2644\" data-end=\"2727\"><td data-start=\"2644\" data-end=\"2670\" data-col-size=\"sm\">Einheimische Hersteller (China)<\/td><td data-col-size=\"md\" data-start=\"2670\" data-end=\"2727\">Dongguan Shengyi, Taizhou Wangling, Taixing Microwave<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"2729\" data-end=\"2849\">(Verwenden Sie diese Beispielmaterialien als Ausgangspunkt. Jedes Design braucht die richtige Materialauswahl f\u00fcr Frequenz und Layout).<\/p><hr data-start=\"2851\" data-end=\"2854\" \/><h1 data-start=\"2856\" data-end=\"2913\">Unterschied zwischen Hochfrequenzplatinen und HDI-Platinen<\/h1><p data-start=\"2915\" data-end=\"3218\">Hochfrequenz-Leiterplatten werden f\u00fcr Radar, Testinstrumente, Kollisionsvermeidungssysteme f\u00fcr Kraftfahrzeuge, Kommunikationssatelliten, drahtlose Systeme und andere Bereiche verwendet. HDI-Leiterplatten (High Density Interconnect) sind f\u00fcr kleine Ger\u00e4te mit vielen Komponenten gedacht. Bei HDI werden h\u00e4ufig doppelseitige Leiterplatten f\u00fcr Produkte mit geringem Volumen verwendet.<\/p><p data-start=\"3220\" data-end=\"3555\">Eine Hochfrequenzplatine erfordert eine sehr hohe Prozesskontrolle und Pr\u00e4zision. Oftmals gehen die Entwickler von FR-4-Glasepoxid aus, doch f\u00fcr echte Hochfrequenzplatinen werden spezielle Laminate verwendet. Die Platine muss eine kleine und stabile Dielektrizit\u00e4tskonstante, einen niedrigen dielektrischen Verlust, eine geringe Wasseraufnahme, eine hohe Temperaturtoleranz und eine gute Korrosionsbest\u00e4ndigkeit aufweisen.<\/p><p data-start=\"3557\" data-end=\"3824\">Eine HDI-Platine verwendet Mikro-Blind-Vias, um eine hohe Routing-Dichte zu erreichen. Sie verf\u00fcgt \u00fcber interne und externe Leiterbahnen, die durch Bohren und Plattieren verbunden werden. HDI ist f\u00fcr kompakte Produkte geeignet. Einige HDI-Designs verwenden modulare parallele Module und eine starke DSP-Steuerung f\u00fcr Leistungs- und Lastfunktionen.<\/p><hr data-start=\"3826\" data-end=\"3829\" \/><h1 data-start=\"3831\" data-end=\"3880\">Typen \/ Klassifizierung von Hochfrequenzplatinen<\/h1><p data-start=\"3882\" data-end=\"3938\">Nachfolgend sind g\u00e4ngige Typen und Hinweise zu ihrer Verarbeitung aufgef\u00fchrt:<\/p><p data-start=\"3940\" data-end=\"3989\"><strong data-start=\"3940\" data-end=\"3987\">1. Pulvergef\u00fcllter Duroplast (keramikgef\u00fcllt)<\/strong><\/p><ul data-start=\"3990\" data-end=\"4260\"><li data-start=\"3990\" data-end=\"4078\"><p data-start=\"3992\" data-end=\"4078\">Materialien und Lieferanten: Rogers 4350B \/ 4003C; Arlon 25N \/ 25FR; Taconic TLG-Serie.<img decoding=\"async\" class=\"size-full wp-image-2730 aligncenter\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-4350b.webp\" alt=\"Rogers 4350b\" width=\"600\" height=\"308\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-4350b.webp 600w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-4350b-300x154.webp 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p><\/li><li data-start=\"4079\" data-end=\"4260\"><p data-start=\"4081\" data-end=\"4260\">Verarbeitung: Die Schritte sind \u00e4hnlich wie bei FR-4-Epoxidglaslaminaten. Allerdings sind die Platten spr\u00f6de und leicht zu brechen. Die Standzeit f\u00fcr Bohrer und Fr\u00e4ser sinkt um 20%. Mit Vorsicht behandeln.<\/p><\/li><\/ul><p data-start=\"4262\" data-end=\"4309\"><strong data-start=\"4262\" data-end=\"4307\">2. PTFE (Polytetrafluorethylen, Teflon)<\/strong><\/p><ul data-start=\"4310\" data-end=\"5232\"><li data-start=\"4310\" data-end=\"4539\"><p data-start=\"4312\" data-end=\"4338\">Materialien und Lieferanten:<\/p><ul data-start=\"4341\" data-end=\"4539\"><li data-start=\"4341\" data-end=\"4389\"><p data-start=\"4343\" data-end=\"4389\">Rogers: RO3000-Serie, RT-Serie, TMM-Serie<img decoding=\"async\" class=\"alignnone size-full wp-image-2731\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-RO3003.webp\" alt=\"Rogers RO3003\" width=\"600\" height=\"450\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-RO3003.webp 600w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-RO3003-300x225.webp 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p><\/li><li data-start=\"4392\" data-end=\"4439\"><p data-start=\"4394\" data-end=\"4439\">Arlon: AD\/AR-Serie, IsoClad, CuClad-Serie<\/p><\/li><li data-start=\"4442\" data-end=\"4488\"><p data-start=\"4444\" data-end=\"4488\">Taconic: RF-Serie, TLX-Serie, TLY-Serie<\/p><\/li><li data-start=\"4491\" data-end=\"4539\"><p data-start=\"4493\" data-end=\"4539\">Taixing Mikrowelle: F4B \/ F4BM \/ F4BK \/ TP-2B<\/p><\/li><\/ul><\/li><li data-start=\"4540\" data-end=\"5232\"><p data-start=\"4542\" data-end=\"4570\">Verarbeitungshinweise f\u00fcr PTFE:<\/p><ul data-start=\"4573\" data-end=\"5232\"><li data-start=\"4573\" data-end=\"4657\"><p data-start=\"4575\" data-end=\"4657\">Achten Sie beim Schneiden von Rohplatten auf eine Schutzfolie, um Kratzer und Druckstellen zu vermeiden.<\/p><\/li><li data-start=\"4660\" data-end=\"4791\"><p data-start=\"4662\" data-end=\"4791\">Verwenden Sie neue Bohrer (Standardbohrer #130 empfohlen). Die besten Ergebnisse erzielen Sie, wenn Sie jeweils ein Blatt bohren. Halten Sie den Klammerdruck bei ~40 psi.<\/p><\/li><li data-start=\"4794\" data-end=\"4872\"><p data-start=\"4796\" data-end=\"4872\">Verwenden Sie einen Aluminium-Anschlag und 1 mm dicke Melaminpads, um PTFE w\u00e4hrend des Bohrens zu halten.<\/p><\/li><li data-start=\"4875\" data-end=\"4931\"><p data-start=\"4877\" data-end=\"4931\">Blasen Sie nach dem Bohren den Staub mit Hei\u00dfluft aus den L\u00f6chern.<\/p><\/li><li data-start=\"4934\" data-end=\"5044\"><p data-start=\"4936\" data-end=\"5044\">Verwenden Sie eine stabile Bohrmaschine. Erh\u00f6hen Sie bei kleinen L\u00f6chern die Drehzahl und reduzieren Sie die Spanlast und die Spindelr\u00fccklaufgeschwindigkeit.<\/p><\/li><li data-start=\"5047\" data-end=\"5155\"><p data-start=\"5049\" data-end=\"5155\">Oberfl\u00e4chenbehandlung der L\u00f6cher: Niedertemperatur-Plasma oder Natriumnaphthalin-Aktivierung unterst\u00fctzen die Metallisierung der L\u00f6cher.<\/p><\/li><li data-start=\"5158\" data-end=\"5232\"><p data-start=\"5160\" data-end=\"5232\">PTH (plated through hole) Kupferabscheidung und -haftung bed\u00fcrfen der Aufmerksamkeit.<\/p><\/li><\/ul><\/li><\/ul><p data-start=\"5234\" data-end=\"5264\"><strong data-start=\"5234\" data-end=\"5262\">3. PTH-Kupferabscheidung<\/strong><\/p><ul data-start=\"5265\" data-end=\"5384\"><li data-start=\"5265\" data-end=\"5384\"><p data-start=\"5267\" data-end=\"5384\">Nach dem Mikro-\u00c4tzen (~20 Mikrozoll Kontrolle), PTH durchf\u00fchren. Falls erforderlich, f\u00fchren Sie einen zweiten PTH-Durchgang durch, wie es das Routing der Leiterplatte erfordert.<\/p><\/li><\/ul><p data-start=\"5386\" data-end=\"5427\"><strong data-start=\"5386\" data-end=\"5425\">4. Verfahren der L\u00f6tmaske (gr\u00fcne Maske)<\/strong><\/p><ul data-start=\"5428\" data-end=\"5701\"><li data-start=\"5428\" data-end=\"5498\"><p data-start=\"5430\" data-end=\"5498\">Vorbehandlung: saure\/alkalische Reinigung; mechanisches Schleifen vermeiden.<\/p><\/li><li data-start=\"5499\" data-end=\"5574\"><p data-start=\"5501\" data-end=\"5574\">Nach der Vorverarbeitung wird die Platte gebacken (90\u00b0C f\u00fcr 30 Minuten) und mit einer trockenen Folie versehen.<\/p><\/li><li data-start=\"5575\" data-end=\"5701\"><p data-start=\"5577\" data-end=\"5701\">In drei Stufen backen: 80\u00b0C, 100\u00b0C, 150\u00b0C, jeweils 30 Minuten. Wenn die Maske \u00d6lflecken aufweist, die Maske entfernen und die Aktivierungsbehandlung wiederholen.<\/p><\/li><\/ul><p data-start=\"5703\" data-end=\"5741\"><strong data-start=\"5703\" data-end=\"5739\">5. Fr\u00e4sen \/ Fr\u00e4sen von PTFE-Platten<\/strong><\/p><ul data-start=\"5742\" data-end=\"6038\"><li data-start=\"5742\" data-end=\"5835\"><p data-start=\"5744\" data-end=\"5835\">Verwenden Sie d\u00fcnnes Papier auf der PTFE-Leiterbahnseite und klemmen Sie es w\u00e4hrend des Fr\u00e4sens mit FR-4 oder Phenolharz ab.<\/p><\/li><li data-start=\"5836\" data-end=\"6038\"><p data-start=\"5838\" data-end=\"6038\">Nach dem Fr\u00e4sen die Kantengrate von Hand nachbearbeiten und sorgf\u00e4ltig pr\u00fcfen. Vermeiden Sie Besch\u00e4digungen des Kupfers und der Platinenoberfl\u00e4che. Verwenden Sie schwefelfreies Trennpapier. Reduzieren Sie die Grate gut. Der Fr\u00e4svorgang muss eine gute Kantenbearbeitung hinterlassen.<\/p><\/li><\/ul><hr data-start=\"6040\" data-end=\"6043\" \/><h1 data-start=\"6045\" data-end=\"6093\">Produktionsablauf f\u00fcr Hochfrequenz-PTFE-Platten<\/h1><p data-start=\"6095\" data-end=\"6167\">Im Folgenden finden Sie drei g\u00e4ngige Prozessabl\u00e4ufe. Der \u00dcbersichtlichkeit halber habe ich sie in einer Tabelle zusammengefasst.<\/p><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"6169\" data-end=\"6917\"><thead data-start=\"6169\" data-end=\"6207\"><tr data-start=\"6169\" data-end=\"6207\"><th data-start=\"6169\" data-end=\"6184\" data-col-size=\"sm\">Prozess-Typ<\/th><th data-start=\"6184\" data-end=\"6207\" data-col-size=\"xl\">Wichtige Schritte (Zusammenfassung)<\/th><\/tr><\/thead><tbody data-start=\"6218\" data-end=\"6917\"><tr data-start=\"6218\" data-end=\"6482\"><td data-start=\"6218\" data-end=\"6260\" data-col-size=\"sm\">NPTH (Non-Plated Through Hole) f\u00fcr PTFE<\/td><td data-col-size=\"xl\" data-start=\"6260\" data-end=\"6482\">Schneiden \u2192 Bohren \u2192 Trockenfilm \u2192 Inspektion \u2192 \u00c4tzen \u2192 \u00c4tzinspektion \u2192 L\u00f6tmaske \u2192 Trockenfilmbelichtung \u2192 Hei\u00dfluftl\u00f6ten (HASL) oder Zinnspr\u00fchen \u2192 Fr\u00e4sen\/Formen \u2192 Inspektion \u2192 Endkontrolle \u2192 Verpacken \u2192 Lieferung<\/td><\/tr><tr data-start=\"6483\" data-end=\"6822\"><td data-start=\"6483\" data-end=\"6520\" data-col-size=\"sm\">PTH (Plated Through Hole) f\u00fcr PTFE<\/td><td data-col-size=\"xl\" data-start=\"6520\" data-end=\"6822\">Schneiden \u2192 Bohren \u2192 Lochbehandlung (Niedertemperatur-Plasma oder Natriumnaphthalin-Aktivierung) \u2192 Verkupfern \u2192 Elektrischer Test von Platten \u2192 Trockenfilm \u2192 Inspektion \u2192 Bildgebung \u2192 \u00c4tzen \u2192 \u00c4tzinspektion \u2192 L\u00f6tmaske \u2192 Trockenfilmbelichtung \u2192 HASL \u2192 Fr\u00e4sen\/Formen \u2192 Inspektion \u2192 Endkontrolle \u2192 Verpacken \u2192 Lieferung<\/td><\/tr><tr data-start=\"6823\" data-end=\"6917\"><td data-start=\"6823\" data-end=\"6854\" data-col-size=\"sm\">Kontrollen des L\u00f6tmaskenprozesses<\/td><td data-col-size=\"xl\" data-start=\"6854\" data-end=\"6917\">Kontrollieren Sie die Haftung der gr\u00fcnen Maske und die Blasenbildung sorgf\u00e4ltig.<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"6919\" data-end=\"6999\">Hinweis: Bei jedem Prozessschritt m\u00fcssen Oberfl\u00e4chenkratzer und andere Defekte streng kontrolliert werden.<\/p><hr data-start=\"7001\" data-end=\"7004\" \/><h1 data-start=\"7006\" data-end=\"7043\">Anwendungen von Hochfrequenz-PCBs<\/h1><p data-start=\"7045\" data-end=\"7084\">Hochfrequenz-PCB treten h\u00e4ufig in:<\/p><ul data-start=\"7086\" data-end=\"7468\"><li data-start=\"7086\" data-end=\"7137\"><p data-start=\"7088\" data-end=\"7137\">Leistungsverst\u00e4rker und rauscharme Verst\u00e4rker (LNA)<\/p><\/li><li data-start=\"7138\" data-end=\"7198\"><p data-start=\"7140\" data-end=\"7198\">Mobile Kommunikationsprodukte und intelligente Beleuchtungssysteme<\/p><\/li><li data-start=\"7199\" data-end=\"7273\"><p data-start=\"7201\" data-end=\"7273\">Leistungsteiler, Koppler, Duplexer, Filter und andere passive Ger\u00e4te<\/p><\/li><li data-start=\"7274\" data-end=\"7366\"><p data-start=\"7276\" data-end=\"7366\">Kollisionsvermeidungssysteme f\u00fcr Kraftfahrzeuge, Kommunikationssatelliten, drahtlose Telefonsysteme<\/p><\/li><li data-start=\"7367\" data-end=\"7468\"><p data-start=\"7369\" data-end=\"7468\">Kurz gesagt, die Elektronik bewegt sich hin zu h\u00f6heren Frequenzen, und Hochfrequenzplatinen folgen diesem Trend.<\/p><\/li><\/ul><hr data-start=\"7470\" data-end=\"7473\" \/><h1 data-start=\"7475\" data-end=\"7510\">Wie man Hochfrequenz-Leiterplatten entwirft<\/h1><p data-start=\"7512\" data-end=\"7840\">Beim Design von Hochfrequenz-Leiterplatten ist das Layout der Stromversorgungsebene entscheidend. Normalerweise wird die Stromversorgung auf einer eigenen Ebene untergebracht. Dies hilft der Schaltung, den Weg der geringsten Impedanz zu nehmen. Die Stromversorgungsebene muss R\u00fcckleitungen f\u00fcr alle Signale auf der Leiterplatte bereitstellen. Das verringert den Schleifenbereich und reduziert das Rauschen. Designer von Niederfrequenzschaltungen ignorieren oft einige dieser Rauschprobleme.<\/p><p data-start=\"7842\" data-end=\"7890\">Befolgen Sie diese Regeln beim Entwurf von Hochfrequenz-Leiterplatten:<\/p><ul data-start=\"7892\" data-end=\"8086\"><li data-start=\"7892\" data-end=\"7937\"><p data-start=\"7894\" data-end=\"7937\">Halten Sie Strom und Boden stabil und einheitlich.<\/p><\/li><li data-start=\"7938\" data-end=\"8001\"><p data-start=\"7940\" data-end=\"8001\">Durch sorgf\u00e4ltige Verlegung und korrekte Terminierung werden Reflexionen vermieden.<\/p><\/li><li data-start=\"8002\" data-end=\"8086\"><p data-start=\"8004\" data-end=\"8086\">Sorgf\u00e4ltiges Routing und korrekte Terminierung reduzieren die Kapazit\u00e4t und das gemessene \u00dcbersprechen.<\/p><\/li><\/ul><p data-start=\"8088\" data-end=\"8124\">Im Folgenden gehe ich auf einige wichtige Themen ein.<\/p><h2 data-start=\"8126\" data-end=\"8156\">(1) Breite der \u00dcbertragungsleitung<\/h2><p data-start=\"8158\" data-end=\"8249\">Die Breite der \u00dcbertragungsleitung muss beim Design von Hochfrequenz-Leiterplatten der Impedanzanpassungstheorie folgen.<\/p><p data-start=\"8251\" data-end=\"8701\"><strong data-start=\"8251\" data-end=\"8273\">Impedanzanpassung<\/strong><br data-start=\"8273\" data-end=\"8276\" \/>Wenn die Eingangs-\/Ausgangsimpedanz und die Impedanz der \u00dcbertragungsleitung \u00fcbereinstimmen, bietet das System maximale Ausgangsleistung und minimale Reflexion. Bei Mikrowellenschaltungen m\u00fcssen bei der Anpassung auch die Vorspannungspunkte der Ger\u00e4te ber\u00fccksichtigt werden. Durchkontaktierungen auf Signalleitungen ver\u00e4ndern die \u00dcbertragungseigenschaften. Bei TTL- und CMOS-Schaltungen ist die charakteristische Impedanz hoch, so dass der Effekt gering ist. Bei 50 \u03a9-HF-Leitungen mit niedriger Impedanz m\u00fcssen jedoch Durchkontaktierungen ber\u00fccksichtigt werden. Normalerweise sollten Durchkontaktierungen auf solchen Leitungen vermieden werden.<\/p><h2 data-start=\"8703\" data-end=\"8755\">(2) Nebensprechen zwischen parallelen \u00dcbertragungsleitungen<\/h2><p data-start=\"8757\" data-end=\"9122\">Wenn zwei Mikrostreifenleitungen eng und parallel verlaufen, kommt es zu einer Kopplung. Sie verursachen \u00dcbersprechen und \u00e4ndern den Wellenwiderstand der Leitung. Achten Sie auf 50 \u03a9- und 75 \u03a9-Schaltungen. Konstrukteure k\u00f6nnen die Kopplung f\u00fcr einige Funktionen nutzen, z. B. f\u00fcr Richtungskoppler oder Leistungsmessungen. Beispielwerte aus einem Entwurf (1,97 GHz PCS-Endverst\u00e4rker f\u00fcr Basisstationen, dielektrisches \u03b5r = 3,48):<\/p><ul data-start=\"9124\" data-end=\"9266\"><li data-start=\"9124\" data-end=\"9195\"><p data-start=\"9126\" data-end=\"9195\">F\u00fcr einen 10-dB-Richtungskoppler: S = 5 mil, l = 920 mil, W = 53 mil<\/p><\/li><li data-start=\"9196\" data-end=\"9266\"><p data-start=\"9198\" data-end=\"9266\">F\u00fcr einen 20-dB-Richtungskoppler: S = 35 mil, l = 920 mil, W = 62 mil<\/p><\/li><\/ul><p data-start=\"9268\" data-end=\"9308\">Befolgen Sie diese Regeln, um das \u00dcbersprechen zu reduzieren:<\/p><p data-start=\"9310\" data-end=\"9556\">A. Der Abstand S zwischen parallelen Hochfrequenz- oder Hochgeschwindigkeitsleitungen muss mindestens eine Leitungsbreite betragen.<br data-start=\"9404\" data-end=\"9407\" \/>B. Schneiden Sie die parallele L\u00e4nge nach M\u00f6glichkeit ab.<br data-start=\"9450\" data-end=\"9453\" \/>C. Halten Sie winzige Hochfrequenzsignale von Strom- und Logikleitungen fern, die starke St\u00f6rungen verursachen k\u00f6nnen.<\/p><h2 data-start=\"9558\" data-end=\"9600\">(3) Erdung \u00fcber elektromagnetische Analyse<\/h2><p data-start=\"9602\" data-end=\"10021\">Bringen Sie f\u00fcr IC-Massestifte oder andere Massestifte in Hochfrequenzschaltungen Massedurchf\u00fchrungen in der N\u00e4he der Stifte an. Die Idee: Ein kurzer Massepfad wirkt wie eine induktive Impedanz. Erdungsdurchf\u00fchrungen wirken ebenfalls induktiv. Dies beeintr\u00e4chtigt die Filterfunktion. Aus diesem Grund sollten Sie Massebohrungen in der N\u00e4he von Stiften anbringen. Um die induktive Last zu verringern, sollten Sie mehr Massebohrungen als bei Niederfrequenzplatinen verwenden. Dies erh\u00f6ht die Massestromkapazit\u00e4t und tr\u00e4gt dazu bei, dass alle Punkte nahe 0 V bleiben.<\/p><h2 data-start=\"10023\" data-end=\"10045\">(4) Leistungsfilterung<\/h2><p data-start=\"10047\" data-end=\"10529\">Bei TTL- und CMOS-Schaltungen f\u00fcgen die Entwickler Bypass-Kondensatoren in der N\u00e4he der Versorgungspins hinzu, um das logische Rauschen zu reduzieren. Bei Hochfrequenz- und Mikrowellenschaltungen reicht dies jedoch nicht aus. Hochfrequenzsignale verursachen hochfrequente St\u00f6rungen auf der Stromversorgung. Verwenden Sie Serieninduktivit\u00e4ten und -kondensatoren. W\u00e4hlen Sie die Induktivit\u00e4ten nach der Arbeitsfrequenz aus. Beispiel: zum Filtern von Rauschen &gt;1 MHz mit C = 0,1 \u03bcF, w\u00e4hlen Sie L = 1 \u03bcH. Seien Sie vorsichtig, wenn Sie Induktivit\u00e4ten an Kollektor-Signalpins mit offenem Stromkreis hinzuf\u00fcgen. Die Induktivit\u00e4t wirkt dann wie eine Anpassungsinduktivit\u00e4t.<\/p><h2 data-start=\"10531\" data-end=\"10547\">(5) Abschirmung<\/h2><p data-start=\"10549\" data-end=\"10680\">Verwenden Sie eine Abschirmung, um kleine oder hochfrequente Signale zu sch\u00fctzen. Dies verringert starke Signalst\u00f6rungen und reduziert die elektromagnetische Interferenz. Einige Richtlinien:<\/p><p data-start=\"10682\" data-end=\"10902\">A. Bei niederfrequenten digitalen\/analogen (&lt;30 MHz) Kleinsignaldesigns sind digitale und analoge Massen aufzuteilen, und die Massefl\u00e4che ist in Kleinsignalbereichen zu gie\u00dfen. Halten Sie den Abstand zwischen der Massefl\u00e4che und den Leiterbahnen gr\u00f6\u00dfer als die Leiterbahnbreite.<\/p><p data-start=\"10904\" data-end=\"11021\">B. Bei digitalen\/analogen Hochfrequenz-Kleinsignaldesigns sind zur Isolierung von Bereichen Abschirmdosen oder gen\u00e4hte Massedurchf\u00fchrungen hinzuzuf\u00fcgen.<\/p><p data-start=\"10904\" data-end=\"11021\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2729\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Isola-PCB.webp\" alt=\"Isola-PCB\" width=\"600\" height=\"449\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Isola-PCB.webp 600w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Isola-PCB-300x225.webp 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p><p data-start=\"11023\" data-end=\"11245\">C. Bei Hochfrequenzschaltungen mit hoher Leistung ist der Hochfrequenzteil als separates Funktionsmodul auszuf\u00fchren und zur Verringerung der Strahlung mit einer Metallabschirmung zu versehen. Zum Beispiel Glasfaser-Transceivermodule mit 155 M, 622 M oder 2 Gb\/s.<\/p><p data-start=\"11247\" data-end=\"11435\">Eine mehrlagige Leiterplatte f\u00fcr ein Mobiltelefon (Beispiel: Nokia 6110) kann Komponenten auf beiden Seiten platzieren und interne Masseverbindungen verwenden, wie in der Originalabbildung gezeigt. (Bildreferenzen hier weggelassen.)<\/p><hr data-start=\"11437\" data-end=\"11440\" \/><h1 data-start=\"11442\" data-end=\"11490\">Beispiele f\u00fcr die Materialauswahl f\u00fcr hohe Bretter<\/h1><p data-start=\"11492\" data-end=\"11548\">Im Folgenden finden Sie Beispiele f\u00fcr von uns entwickelte und getestete Boards:<\/p><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"11550\" data-end=\"12491\"><thead data-start=\"11550\" data-end=\"11608\"><tr data-start=\"11550\" data-end=\"11608\"><th data-start=\"11550\" data-end=\"11580\" data-col-size=\"sm\">Anwendung (Freq \/ Ger\u00e4t)<\/th><th data-start=\"11580\" data-end=\"11599\" data-col-size=\"md\">Material \/ Stapel<\/th><th data-start=\"11599\" data-end=\"11608\" data-col-size=\"md\">Anmerkungen<\/th><\/tr><\/thead><tbody data-start=\"11624\" data-end=\"12491\"><tr data-start=\"11624\" data-end=\"11797\"><td data-start=\"11624\" data-end=\"11656\" data-col-size=\"sm\">2,4-GHz-Spreizspektrum-Relais<\/td><td data-col-size=\"md\" data-start=\"11656\" data-end=\"11700\">FR-4, 4-Lagen-Leiterplatte mit gro\u00dfen Masseanteilen<\/td><td data-col-size=\"md\" data-start=\"11700\" data-end=\"11797\">Hochfrequenter analoger Teil getrennt. Stromleitungen verwenden Induktivit\u00e4ten zur Trennung vom digitalen Teil.<\/td><\/tr><tr data-start=\"11798\" data-end=\"11939\"><td data-start=\"11798\" data-end=\"11823\" data-col-size=\"sm\">2,4 GHz RF-Transceiver<\/td><td data-col-size=\"md\" data-start=\"11823\" data-end=\"11859\">PTFE-Material, doppelseitige Platte<\/td><td data-col-size=\"md\" data-start=\"11859\" data-end=\"11939\">HF-Senden und -Empfangen in getrennten Metallabschirmungen; Leistungseingang gefiltert.<\/td><\/tr><tr data-start=\"11940\" data-end=\"12035\"><td data-start=\"11940\" data-end=\"11965\" data-col-size=\"sm\">1,9 GHz RF-Transceiver<\/td><td data-col-size=\"md\" data-start=\"11965\" data-end=\"11994\">PTFE-Material, 4-Schicht-Leiterplatte<\/td><td data-col-size=\"md\" data-start=\"11994\" data-end=\"12035\">Verwenden Sie gro\u00dfe Erdsch\u00fcttungen und Abschirmungen.<\/td><\/tr><tr data-start=\"12036\" data-end=\"12123\"><td data-start=\"12036\" data-end=\"12061\" data-col-size=\"sm\">140-MHz-ZF-Transceiver<\/td><td data-col-size=\"md\" data-start=\"12061\" data-end=\"12086\">Obere Schicht S1139 0,3 mm<\/td><td data-col-size=\"md\" data-start=\"12086\" data-end=\"12123\">Gro\u00dfer Bodenaushub; \u00fcber Isolierung.<\/td><\/tr><tr data-start=\"12124\" data-end=\"12223\"><td data-start=\"12124\" data-end=\"12148\" data-col-size=\"sm\">70-MHz-ZF-Transceiver<\/td><td data-col-size=\"md\" data-start=\"12148\" data-end=\"12168\">FR-4, 4-Lagen-Leiterplatte<\/td><td data-col-size=\"md\" data-start=\"12168\" data-end=\"12223\">Gro\u00dfer Bodensch\u00fcttung; Modulabtrennung \u00fcber Z\u00e4une.<\/td><\/tr><tr data-start=\"12224\" data-end=\"12385\"><td data-start=\"12224\" data-end=\"12247\" data-col-size=\"sm\">30 W Leistungsverst\u00e4rker<\/td><td data-col-size=\"md\" data-start=\"12247\" data-end=\"12283\">RO4350 Material, doppelseitige Leiterplatte<\/td><td data-col-size=\"md\" data-start=\"12283\" data-end=\"12385\">Gro\u00dfer Erdungssch\u00fcttung; auf &gt;= 50 \u03a9 Leitungsbreite kontrollierter Abstand; Abschirmkasten und Filterung der Stromzufuhr.<\/td><\/tr><tr data-start=\"12386\" data-end=\"12491\"><td data-start=\"12386\" data-end=\"12414\" data-col-size=\"sm\">2000-MHz-Mikrowellenquelle<\/td><td data-col-size=\"md\" data-start=\"12414\" data-end=\"12433\">S1139 0,8 mm oben<\/td><td data-col-size=\"md\" data-start=\"12433\" data-end=\"12491\">Doppelseitige Leiterplatte; pr\u00e4zise Kontrolle der Leiterbahnabmessungen.<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"12493\" data-end=\"12573\">Verwenden Sie diese als Beispiele. Jedes Projekt erfordert eine eigene Wahl des Materials und der St\u00e4rke.<\/p><hr data-start=\"12575\" data-end=\"12578\" \/><h1 data-start=\"12580\" data-end=\"12622\">Materialanforderungen f\u00fcr Hochfrequenz-Leiterplatten<\/h1><p data-start=\"12624\" data-end=\"12677\">Konstrukteure sollten diese wichtigen Materialeigenschaften \u00fcberpr\u00fcfen:<\/p><ol data-start=\"12679\" data-end=\"13167\"><li data-start=\"12679\" data-end=\"12784\"><p data-start=\"12682\" data-end=\"12784\"><strong data-start=\"12682\" data-end=\"12720\">Dielektrischer Verlust (Df, Verlusttangens)<\/strong> muss sehr gering sein. Geringer Verlust bedeutet weniger Signald\u00e4mpfung.<\/p><\/li><li data-start=\"12785\" data-end=\"12884\"><p data-start=\"12788\" data-end=\"12884\"><strong data-start=\"12788\" data-end=\"12812\">Geringe Wasseraufnahme<\/strong> ist wichtig. Eine hohe Wasseraufnahme ver\u00e4ndert die Dielektrizit\u00e4tskonstante und den Verlust.<\/p><\/li><li data-start=\"12885\" data-end=\"13021\"><p data-start=\"12888\" data-end=\"13021\"><strong data-start=\"12888\" data-end=\"12916\">Dielektrizit\u00e4tskonstante (DK)<\/strong> muss niedrig und stabil sein. Ein niedriger DK f\u00fchrt zu einer h\u00f6heren Signalgeschwindigkeit. Die DK-Stabilit\u00e4t tr\u00e4gt auch zur Impedanzkontrolle bei.<\/p><\/li><li data-start=\"13022\" data-end=\"13167\"><p data-start=\"13025\" data-end=\"13167\"><strong data-start=\"13025\" data-end=\"13050\">CTE und thermische \u00dcbereinstimmung<\/strong> zwischen Kupferfolie und Basis muss \u00e4hnlich sein. Eine gro\u00dfe Abweichung bei Temperaturschwankungen kann zur Delaminierung des Kupfers f\u00fchren.<\/p><\/li><\/ol><p data-start=\"13169\" data-end=\"13256\">Hochfrequenz bedeutet oft die Verwendung von Fluorpolymersubstraten wie PTFE (bekannt als Teflon).<\/p><hr data-start=\"13258\" data-end=\"13261\" \/><h1 data-start=\"13263\" data-end=\"13321\">Herstellungshinweise und Vorsichtsma\u00dfnahmen f\u00fcr Hochfrequenz-Leiterplatten<\/h1><ol data-start=\"13323\" data-end=\"13843\"><li data-start=\"13323\" data-end=\"13424\"><p data-start=\"13326\" data-end=\"13424\"><strong data-start=\"13326\" data-end=\"13358\">Die Impedanzkontrolle ist streng.<\/strong> Die Linienbreitentoleranz ist eng. Typische Kontrolltoleranz ~ \u00b12%.<\/p><\/li><li data-start=\"13425\" data-end=\"13580\"><p data-start=\"13428\" data-end=\"13580\"><strong data-start=\"13428\" data-end=\"13473\">Die PTH-Haftung ist auf speziellen Materialien gering.<\/strong> Verwenden Sie die Plasma-Oberfl\u00e4chenaufrauhung f\u00fcr L\u00f6cher und Oberfl\u00e4chen, um die Haftung f\u00fcr die Beschichtung und den L\u00f6tstopplack zu erh\u00f6hen.<\/p><\/li><li data-start=\"13581\" data-end=\"13711\"><p data-start=\"13584\" data-end=\"13711\"><strong data-start=\"13584\" data-end=\"13627\">Schleifen Sie die Platine vor dem L\u00f6ten nicht ab.<\/strong> Dies verringert die Haftung. Verwenden Sie nur Mikro-\u00c4tzl\u00f6sungen oder andere Aufrauhungsmethoden.<\/p><\/li><li data-start=\"13712\" data-end=\"13843\"><p data-start=\"13715\" data-end=\"13843\"><strong data-start=\"13715\" data-end=\"13783\">PTFE-Platten verursachen bei normalen Fr\u00e4swerkzeugen oft raue Kanten.<\/strong> Verwenden Sie spezielle Fr\u00e4swerkzeuge und beachten Sie die PTFE-Fr\u00e4smethoden.<\/p><\/li><\/ol><hr data-start=\"13845\" data-end=\"13848\" \/><h1 data-start=\"13850\" data-end=\"13868\">Kurzes Fazit<\/h1><p data-start=\"13870\" data-end=\"14235\">Hochfrequenzleiterplatten erfordern spezielle Materialien und eine sorgf\u00e4ltige Prozesskontrolle. W\u00e4hlen Sie ein Material, das Ihren Frequenz- und W\u00e4rmeanforderungen entspricht. Kontrollieren Sie die Impedanz und platzieren Sie Erdungsl\u00f6cher sorgf\u00e4ltig. Verwenden Sie Abschirmungen und eine korrekte Leistungsfilterung. Befolgen Sie spezielle Handhabungsschritte f\u00fcr PTFE und andere Mikrowellenlaminate. Diese Schritte verbessern die Leistung und den Ertrag von Hochfrequenzschaltungen.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-brlk2x4 elementor-section-content-top elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"brlk2x4\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7882748\" data-id=\"7882748\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9fc6712 elementor-widget elementor-widget-heading\" data-id=\"9fc6712\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">H\u00e4ufig gestellte Fragen<\/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\">Welche Substratmaterialien werden \u00fcblicherweise f\u00fcr Hochfrequenzleiterplatten verwendet?<\/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>Typische Materialien sind Laminate auf PTFE-Basis (Teflon) und technische Verbundwerkstoffe von Anbietern wie Rogers (RO3000\/RO4000\/RT\/duroid) und Isola, die wegen ihres niedrigen Verlusttangens und ihrer stabilen Dielektrizit\u00e4tskonstante ausgew\u00e4hlt werden.<\/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\">Warum nicht einfach FR-4 f\u00fcr RF\/Hochfrequenz-Designs verwenden?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1032\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-1032\"><p>FR-4 hat einen h\u00f6heren dielektrischen Verlust und eine weniger stabile Dielektrizit\u00e4tskonstante bei GHz-Frequenzen, was den Signalverlust und die Impedanzvariabilit\u00e4t erh\u00f6ht; f\u00fcr viele HF- oder Mikrowellenanwendungen sind Laminate der PTFE\/Rogers-Klasse wesentlich besser geeignet.<\/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\">Welche elektrischen Eigenschaften sind am wichtigsten (Dk, Verlusttangente)?<\/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>Die Dielektrizit\u00e4tskonstante (Dk) steuert die Impedanz und die Signalgeschwindigkeit; der Verlusttangens (Df) bestimmt die Signald\u00e4mpfung. Eine niedrige, stabile Dk und ein niedriger Verlusttangens sind f\u00fcr eine gleichbleibende Hochfrequenzleistung unerl\u00e4sslich.<\/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\">Typische Anwendungen f\u00fcr Hochfrequenz-Leiterplatten?<\/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>Antennen, RF-Verst\u00e4rker, Filter, 5G-Basisstationen, Mikrowellenfunkverbindungen, Satellitenkommunikation, Radar und Hochgeschwindigkeits-RF-Module.<\/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\">Wie w\u00e4hle ich das richtige Hochfrequenzlaminat aus?<\/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>Abstimmung des erforderlichen Frequenzbereichs, der angestrebten Impedanzstabilit\u00e4t, der thermischen\/CTE-Anforderungen und des Verlusttangens. Pr\u00fcfen Sie die Datenbl\u00e4tter der Lieferanten (Rogers, Isola usw.) und fordern Sie Materialtestdaten an (Dk\/Df im Vergleich zur Frequenz).<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>What Is a High-Frequency PCB A high-frequency PCB is a special printed circuit board (PCB) used for high electromagnetic frequency 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center\";s:15:\"background-size\";s:4:\"auto\";s:21:\"background-attachment\";s:6:\"scroll\";s:15:\"background-type\";s:0:\"\";s:16:\"background-media\";s:0:\"\";s:12:\"overlay-type\";s:0:\"\";s:13:\"overlay-color\";s:0:\"\";s:15:\"overlay-opacity\";s:0:\"\";s:16:\"overlay-gradient\";s:0:\"\";}}"],"footnotes":[""],"_elementor_edit_mode":["builder"],"_elementor_template_type":["wp-page"],"_elementor_data":["[{\"id\":\"2fe9c4e\",\"elType\":\"container\",\"settings\":{\"flex_direction\":\"column\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"05b937f\"}]},\"elements\":[{\"id\":\"f058cdb\",\"elType\":\"widget\",\"settings\":{\"editor\":\"<h2 data-start=\\\"315\\\" data-end=\\\"345\\\">What Is a High-Frequency PCB<\\\/h2><p data-start=\\\"347\\\" data-end=\\\"753\\\">A<a href=\\\"https:\\\/\\\/en.wikipedia.org\\\/wiki\\\/Printed_circuit_board#High_frequency_PCBs\\\"> high-frequency PCB<\\\/a> is a special printed circuit board (PCB) used for high electromagnetic frequency signals. These boards are for radio frequencies above about 300 MHz (wavelength &lt; 1 m) and for microwave frequencies above about 3 GHz (wavelength &lt; 0.1 m). They are made on microwave base copper clad laminates. Production may use some standard rigid PCB steps or use special methods for these materials.<\\\/p><p data-start=\\\"347\\\" data-end=\\\"753\\\"><img class=\\\"alignnone size-full wp-image-2728\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/High-Frequency-PCB.webp\\\" alt=\\\"High-Frequency PCB\\\" width=\\\"600\\\" height=\\\"372\\\" \\\/><\\\/p><p data-start=\\\"755\\\" data-end=\\\"1165\\\">With fast progress in technology, more devices work in the microwave band (&gt;1 GHz) and even in millimeter wave ranges (&gt;30 GHz). This means frequencies rise and material needs increase. Base materials must have very good electrical properties and good chemical stability. As the signal frequency goes up, material loss must stay very low. With the arrival of 5G, high-frequency materials became more important.<\\\/p><hr data-start=\\\"1167\\\" data-end=\\\"1170\\\" \\\/><h1 data-start=\\\"1172\\\" data-end=\\\"1207\\\">Advantages of High-Frequency PCBs<\\\/h1><p data-start=\\\"1209\\\" data-end=\\\"1430\\\"><strong data-start=\\\"1209\\\" data-end=\\\"1231\\\">1. High efficiency<\\\/strong><br data-start=\\\"1231\\\" data-end=\\\"1234\\\" \\\/>Materials with low dielectric constant cause low loss. Modern induction heating and other methods can hit targets and keep high efficiency. These boards also help reduce waste and fit green goals.<\\\/p><p data-start=\\\"1432\\\" data-end=\\\"1677\\\"><strong data-start=\\\"1432\\\" data-end=\\\"1449\\\">2. High speed<\\\/strong><br data-start=\\\"1449\\\" data-end=\\\"1452\\\" \\\/>Signal speed is inversely proportional to the square root of the dielectric constant. Lower dielectric constant means faster transmission. Special materials keep dielectric constant low and stable. This helps signal transfer.<\\\/p><p data-start=\\\"1679\\\" data-end=\\\"1970\\\"><strong data-start=\\\"1679\\\" data-end=\\\"1723\\\">3. Good control of heating or processing<\\\/strong><br data-start=\\\"1723\\\" data-end=\\\"1726\\\" \\\/>High-frequency boards are used in many fields that need precise heating of metal parts. You can control how deep or where to heat. You can focus on surface or deep heating. You can heat in a focused or spread way. The board allows fine control.<\\\/p><p data-start=\\\"1972\\\" data-end=\\\"2316\\\"><strong data-start=\\\"1972\\\" data-end=\\\"1996\\\">4. Strong durability<\\\/strong><br data-start=\\\"1996\\\" data-end=\\\"1999\\\" \\\/>Dielectric constant and dielectric material depend on environment. In humid areas, moisture hurts boards. High-frequency boards made from low water absorption material resist this. They resist chemical corrosion, moisture, high heat, and have high peel strength. These qualities make them strong in hard environments.<\\\/p><hr data-start=\\\"2318\\\" data-end=\\\"2321\\\" \\\/><h1 data-start=\\\"2323\\\" data-end=\\\"2375\\\">Common High-Frequency and High-Speed PCB Materials<\\\/h1><div class=\\\"_tableContainer_sk2ct_1\\\"><div class=\\\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\\\" tabindex=\\\"-1\\\"><table class=\\\"w-fit min-w-(--thread-content-width)\\\" data-start=\\\"2377\\\" data-end=\\\"2727\\\"><thead data-start=\\\"2377\\\" data-end=\\\"2419\\\"><tr data-start=\\\"2377\\\" data-end=\\\"2419\\\"><th data-start=\\\"2377\\\" data-end=\\\"2393\\\" data-col-size=\\\"sm\\\">Brand \\\/ Maker<\\\/th><th data-start=\\\"2393\\\" data-end=\\\"2419\\\" data-col-size=\\\"md\\\">Typical Series \\\/ Types<\\\/th><\\\/tr><\\\/thead><tbody data-start=\\\"2430\\\" data-end=\\\"2727\\\"><tr data-start=\\\"2430\\\" data-end=\\\"2473\\\"><td data-start=\\\"2430\\\" data-end=\\\"2439\\\" data-col-size=\\\"sm\\\">Rogers<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"2439\\\" data-end=\\\"2473\\\">RO4003, RO3003, RO4350, RO5880<\\\/td><\\\/tr><tr data-start=\\\"2474\\\" data-end=\\\"2537\\\"><td data-start=\\\"2474\\\" data-end=\\\"2509\\\" data-col-size=\\\"sm\\\">TUC (Taiyao \\\/ TaYa or TUC brand)<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"2509\\\" data-end=\\\"2537\\\">TUC862, 872SLK, 883, 933<\\\/td><\\\/tr><tr data-start=\\\"2538\\\" data-end=\\\"2574\\\"><td data-start=\\\"2538\\\" data-end=\\\"2550\\\" data-col-size=\\\"sm\\\">Panasonic<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"2550\\\" data-end=\\\"2574\\\">Megtron 4, Megtron 6<\\\/td><\\\/tr><tr data-start=\\\"2575\\\" data-end=\\\"2608\\\"><td data-start=\\\"2575\\\" data-end=\\\"2583\\\" data-col-size=\\\"sm\\\">Isola<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"2583\\\" data-end=\\\"2608\\\">FR408HR, IS620, IS680<\\\/td><\\\/tr><tr data-start=\\\"2609\\\" data-end=\\\"2643\\\"><td data-start=\\\"2609\\\" data-end=\\\"2617\\\" data-col-size=\\\"sm\\\">Nelco<\\\/td><td data-start=\\\"2617\\\" data-end=\\\"2643\\\" data-col-size=\\\"md\\\">N4000-13, N4000-13EPSI<\\\/td><\\\/tr><tr data-start=\\\"2644\\\" data-end=\\\"2727\\\"><td data-start=\\\"2644\\\" data-end=\\\"2670\\\" data-col-size=\\\"sm\\\">Domestic makers (China)<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"2670\\\" data-end=\\\"2727\\\">Dongguan Shengyi, Taizhou Wangling, Taixing Microwave<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div><p data-start=\\\"2729\\\" data-end=\\\"2849\\\">(Use these example materials as a starting point. Each design needs the right material choice for frequency and layout.)<\\\/p><hr data-start=\\\"2851\\\" data-end=\\\"2854\\\" \\\/><h1 data-start=\\\"2856\\\" data-end=\\\"2913\\\">Difference Between High-Frequency Boards and HDI Boards<\\\/h1><p data-start=\\\"2915\\\" data-end=\\\"3218\\\">High-frequency PCBs are for radar, test instruments, automotive collision-avoidance systems, communication satellites, wireless systems, and other fields. HDI (High Density Interconnect) boards are for small devices with many components. HDI often uses double-sided boards in products with small volume.<\\\/p><p data-start=\\\"3220\\\" data-end=\\\"3555\\\">A high-frequency board needs very high process control and precision. Many times designers start from FR-4 glass epoxy, but true high-frequency boards use special laminates. The board must have a small and stable dielectric constant, low dielectric loss, low water absorption, high temperature tolerance, and good corrosion resistance.<\\\/p><p data-start=\\\"3557\\\" data-end=\\\"3824\\\">An HDI board uses micro blind vias to reach high routing density. It has internal and external routing that connect by drilling and plating. HDI is for compact products. Some HDI designs use modular parallel modules and strong DSP control for power and load features.<\\\/p><hr data-start=\\\"3826\\\" data-end=\\\"3829\\\" \\\/><h1 data-start=\\\"3831\\\" data-end=\\\"3880\\\">Types \\\/ Classification of High-Frequency Boards<\\\/h1><p data-start=\\\"3882\\\" data-end=\\\"3938\\\">Below are common types and notes about their processing:<\\\/p><p data-start=\\\"3940\\\" data-end=\\\"3989\\\"><strong data-start=\\\"3940\\\" data-end=\\\"3987\\\">1. Powder-filled thermoset (ceramic filled)<\\\/strong><\\\/p><ul data-start=\\\"3990\\\" data-end=\\\"4260\\\"><li data-start=\\\"3990\\\" data-end=\\\"4078\\\"><p data-start=\\\"3992\\\" data-end=\\\"4078\\\">Materials and suppliers: Rogers 4350B \\\/ 4003C; Arlon 25N \\\/ 25FR; Taconic TLG series.<img class=\\\"size-full wp-image-2730 aligncenter\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/Rogers-4350b.webp\\\" alt=\\\"Rogers 4350b\\\" width=\\\"600\\\" height=\\\"308\\\" \\\/><\\\/p><\\\/li><li data-start=\\\"4079\\\" data-end=\\\"4260\\\"><p data-start=\\\"4081\\\" data-end=\\\"4260\\\">Processing: Steps are similar to FR-4 epoxy glass laminates. However, boards are brittle and easy to break. Tool life for drills and router bits drops about 20%. Handle with care.<\\\/p><\\\/li><\\\/ul><p data-start=\\\"4262\\\" data-end=\\\"4309\\\"><strong data-start=\\\"4262\\\" data-end=\\\"4307\\\">2. PTFE (polytetrafluoroethylene, Teflon)<\\\/strong><\\\/p><ul data-start=\\\"4310\\\" data-end=\\\"5232\\\"><li data-start=\\\"4310\\\" data-end=\\\"4539\\\"><p data-start=\\\"4312\\\" data-end=\\\"4338\\\">Materials and suppliers:<\\\/p><ul data-start=\\\"4341\\\" data-end=\\\"4539\\\"><li data-start=\\\"4341\\\" data-end=\\\"4389\\\"><p data-start=\\\"4343\\\" data-end=\\\"4389\\\">Rogers: RO3000 series, RT series, TMM series<img class=\\\"alignnone size-full wp-image-2731\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/Rogers-RO3003.webp\\\" alt=\\\"Rogers RO3003\\\" width=\\\"600\\\" height=\\\"450\\\" \\\/><\\\/p><\\\/li><li data-start=\\\"4392\\\" data-end=\\\"4439\\\"><p data-start=\\\"4394\\\" data-end=\\\"4439\\\">Arlon: AD\\\/AR series, IsoClad, CuClad series<\\\/p><\\\/li><li data-start=\\\"4442\\\" data-end=\\\"4488\\\"><p data-start=\\\"4444\\\" data-end=\\\"4488\\\">Taconic: RF series, TLX series, TLY series<\\\/p><\\\/li><li data-start=\\\"4491\\\" data-end=\\\"4539\\\"><p data-start=\\\"4493\\\" data-end=\\\"4539\\\">Taixing Microwave: F4B \\\/ F4BM \\\/ F4BK \\\/ TP-2B<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"4540\\\" data-end=\\\"5232\\\"><p data-start=\\\"4542\\\" data-end=\\\"4570\\\">Processing notes for PTFE:<\\\/p><ul data-start=\\\"4573\\\" data-end=\\\"5232\\\"><li data-start=\\\"4573\\\" data-end=\\\"4657\\\"><p data-start=\\\"4575\\\" data-end=\\\"4657\\\">Keep protective film when cutting raw sheets to avoid scratches and press marks.<\\\/p><\\\/li><li data-start=\\\"4660\\\" data-end=\\\"4791\\\"><p data-start=\\\"4662\\\" data-end=\\\"4791\\\">Use new drills (standard #130 drills recommended). For best results, drill one sheet at a time. Keep clamp pressure at ~40 psi.<\\\/p><\\\/li><li data-start=\\\"4794\\\" data-end=\\\"4872\\\"><p data-start=\\\"4796\\\" data-end=\\\"4872\\\">Use aluminum backstop and 1 mm melamine pads to hold PTFE during drilling.<\\\/p><\\\/li><li data-start=\\\"4875\\\" data-end=\\\"4931\\\"><p data-start=\\\"4877\\\" data-end=\\\"4931\\\">After drilling, blow dust out of holes with hot air.<\\\/p><\\\/li><li data-start=\\\"4934\\\" data-end=\\\"5044\\\"><p data-start=\\\"4936\\\" data-end=\\\"5044\\\">Use a stable drill machine. For small holes, increase speed and reduce chip load and spindle return speed.<\\\/p><\\\/li><li data-start=\\\"5047\\\" data-end=\\\"5155\\\"><p data-start=\\\"5049\\\" data-end=\\\"5155\\\">Hole surface treatment: low-temperature plasma or sodium naphthalene activation help hole metallization.<\\\/p><\\\/li><li data-start=\\\"5158\\\" data-end=\\\"5232\\\"><p data-start=\\\"5160\\\" data-end=\\\"5232\\\">PTH (plated through hole) copper deposition and adhesion need attention.<\\\/p><\\\/li><\\\/ul><\\\/li><\\\/ul><p data-start=\\\"5234\\\" data-end=\\\"5264\\\"><strong data-start=\\\"5234\\\" data-end=\\\"5262\\\">3. PTH copper deposition<\\\/strong><\\\/p><ul data-start=\\\"5265\\\" data-end=\\\"5384\\\"><li data-start=\\\"5265\\\" data-end=\\\"5384\\\"><p data-start=\\\"5267\\\" data-end=\\\"5384\\\">After micro-etch (~20 microinch control), perform PTH. If needed, run a second PTH pass as required by board routing.<\\\/p><\\\/li><\\\/ul><p data-start=\\\"5386\\\" data-end=\\\"5427\\\"><strong data-start=\\\"5386\\\" data-end=\\\"5425\\\">4. Solder mask (green mask) process<\\\/strong><\\\/p><ul data-start=\\\"5428\\\" data-end=\\\"5701\\\"><li data-start=\\\"5428\\\" data-end=\\\"5498\\\"><p data-start=\\\"5430\\\" data-end=\\\"5498\\\">Pre-process: use acid\\\/alkaline cleaning; avoid mechanical sanding.<\\\/p><\\\/li><li data-start=\\\"5499\\\" data-end=\\\"5574\\\"><p data-start=\\\"5501\\\" data-end=\\\"5574\\\">After pre-process, bake the board (90\\u00b0C for 30 min) and apply dry film.<\\\/p><\\\/li><li data-start=\\\"5575\\\" data-end=\\\"5701\\\"><p data-start=\\\"5577\\\" data-end=\\\"5701\\\">Bake in three stages: 80\\u00b0C, 100\\u00b0C, 150\\u00b0C, 30 min each. If mask shows oil spots, remove mask and repeat activation treatment.<\\\/p><\\\/li><\\\/ul><p data-start=\\\"5703\\\" data-end=\\\"5741\\\"><strong data-start=\\\"5703\\\" data-end=\\\"5739\\\">5. Routing \\\/ milling PTFE boards<\\\/strong><\\\/p><ul data-start=\\\"5742\\\" data-end=\\\"6038\\\"><li data-start=\\\"5742\\\" data-end=\\\"5835\\\"><p data-start=\\\"5744\\\" data-end=\\\"5835\\\">Use thin paper on PTFE trace side and clamp with FR-4 or phenolic backing during routing.<\\\/p><\\\/li><li data-start=\\\"5836\\\" data-end=\\\"6038\\\"><p data-start=\\\"5838\\\" data-end=\\\"6038\\\">After routing, hand-finish edge burrs and inspect carefully. Avoid damaging copper and board surface. Use sulfur-free separation paper. Reduce burrs well. The routing step must leave good edge finish.<\\\/p><\\\/li><\\\/ul><hr data-start=\\\"6040\\\" data-end=\\\"6043\\\" \\\/><h1 data-start=\\\"6045\\\" data-end=\\\"6093\\\">Production Flow for High-Frequency PTFE Boards<\\\/h1><p data-start=\\\"6095\\\" data-end=\\\"6167\\\">Below are three common process flows. I put them in a table for clarity.<\\\/p><div class=\\\"_tableContainer_sk2ct_1\\\"><div class=\\\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\\\" tabindex=\\\"-1\\\"><table class=\\\"w-fit min-w-(--thread-content-width)\\\" data-start=\\\"6169\\\" data-end=\\\"6917\\\"><thead data-start=\\\"6169\\\" data-end=\\\"6207\\\"><tr data-start=\\\"6169\\\" data-end=\\\"6207\\\"><th data-start=\\\"6169\\\" data-end=\\\"6184\\\" data-col-size=\\\"sm\\\">Process Type<\\\/th><th data-start=\\\"6184\\\" data-end=\\\"6207\\\" data-col-size=\\\"xl\\\">Key Steps (summary)<\\\/th><\\\/tr><\\\/thead><tbody data-start=\\\"6218\\\" data-end=\\\"6917\\\"><tr data-start=\\\"6218\\\" data-end=\\\"6482\\\"><td data-start=\\\"6218\\\" data-end=\\\"6260\\\" data-col-size=\\\"sm\\\">NPTH (Non-Plated Through Hole) for PTFE<\\\/td><td data-col-size=\\\"xl\\\" data-start=\\\"6260\\\" data-end=\\\"6482\\\">Cutting \\u2192 Drilling \\u2192 Dry film \\u2192 Inspection \\u2192 Etch \\u2192 Etch inspection \\u2192 Solder mask \\u2192 Dry film exposure \\u2192 Hot air solder leveling (HASL) or tin spray \\u2192 Routing\\\/shaping \\u2192 Inspection \\u2192 Final inspection \\u2192 Packing \\u2192 Delivery<\\\/td><\\\/tr><tr data-start=\\\"6483\\\" data-end=\\\"6822\\\"><td data-start=\\\"6483\\\" data-end=\\\"6520\\\" data-col-size=\\\"sm\\\">PTH (Plated Through Hole) for PTFE<\\\/td><td data-col-size=\\\"xl\\\" data-start=\\\"6520\\\" data-end=\\\"6822\\\">Cutting \\u2192 Drilling \\u2192 Hole treatment (low-temp plasma or sodium naphthalene activation) \\u2192 Copper plating \\u2192 Panel electrical test \\u2192 Dry film \\u2192 Inspection \\u2192 Imaging \\u2192 Etch \\u2192 Etch inspection \\u2192 Solder mask \\u2192 Dry film exposure \\u2192 HASL \\u2192 Routing\\\/shaping \\u2192 Inspection \\u2192 Final inspection \\u2192 Packing \\u2192 Delivery<\\\/td><\\\/tr><tr data-start=\\\"6823\\\" data-end=\\\"6917\\\"><td data-start=\\\"6823\\\" data-end=\\\"6854\\\" data-col-size=\\\"sm\\\">Solder mask process controls<\\\/td><td data-col-size=\\\"xl\\\" data-start=\\\"6854\\\" data-end=\\\"6917\\\">Control green mask adhesion and bubble formation carefully.<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div><p data-start=\\\"6919\\\" data-end=\\\"6999\\\">Note: Each process step must control surface scratch and other defects strictly.<\\\/p><hr data-start=\\\"7001\\\" data-end=\\\"7004\\\" \\\/><h1 data-start=\\\"7006\\\" data-end=\\\"7043\\\">Applications of High-Frequency PCBs<\\\/h1><p data-start=\\\"7045\\\" data-end=\\\"7084\\\">High-frequency PCBs commonly appear in:<\\\/p><ul data-start=\\\"7086\\\" data-end=\\\"7468\\\"><li data-start=\\\"7086\\\" data-end=\\\"7137\\\"><p data-start=\\\"7088\\\" data-end=\\\"7137\\\">Power amplifiers and low noise amplifiers (LNA)<\\\/p><\\\/li><li data-start=\\\"7138\\\" data-end=\\\"7198\\\"><p data-start=\\\"7140\\\" data-end=\\\"7198\\\">Mobile communication products and smart lighting systems<\\\/p><\\\/li><li data-start=\\\"7199\\\" data-end=\\\"7273\\\"><p data-start=\\\"7201\\\" data-end=\\\"7273\\\">Power dividers, couplers, duplexers, filters and other passive devices<\\\/p><\\\/li><li data-start=\\\"7274\\\" data-end=\\\"7366\\\"><p data-start=\\\"7276\\\" data-end=\\\"7366\\\">Automotive collision avoidance systems, communication satellites, wireless phone systems<\\\/p><\\\/li><li data-start=\\\"7367\\\" data-end=\\\"7468\\\"><p data-start=\\\"7369\\\" data-end=\\\"7468\\\">In short, electronics are moving to higher frequencies and high-frequency boards follow this trend.<\\\/p><\\\/li><\\\/ul><hr data-start=\\\"7470\\\" data-end=\\\"7473\\\" \\\/><h1 data-start=\\\"7475\\\" data-end=\\\"7510\\\">How to Design High-Frequency PCBs<\\\/h1><p data-start=\\\"7512\\\" data-end=\\\"7840\\\">In high-frequency PCB design, power plane layout is critical. Usually put power on its own layer. This helps the circuit follow the path of least impedance. Power plane must provide return paths for all signals on the PCB. That lowers loop area and reduces noise. Low-frequency designers often ignore some of these noise issues.<\\\/p><p data-start=\\\"7842\\\" data-end=\\\"7890\\\">Follow these rules in high-frequency PCB design:<\\\/p><ul data-start=\\\"7892\\\" data-end=\\\"8086\\\"><li data-start=\\\"7892\\\" data-end=\\\"7937\\\"><p data-start=\\\"7894\\\" data-end=\\\"7937\\\">Keep power and ground stable and unified.<\\\/p><\\\/li><li data-start=\\\"7938\\\" data-end=\\\"8001\\\"><p data-start=\\\"7940\\\" data-end=\\\"8001\\\">Careful routing and correct termination remove reflections.<\\\/p><\\\/li><li data-start=\\\"8002\\\" data-end=\\\"8086\\\"><p data-start=\\\"8004\\\" data-end=\\\"8086\\\">Careful routing and correct termination reduce capacitance and measured crosstalk.<\\\/p><\\\/li><\\\/ul><p data-start=\\\"8088\\\" data-end=\\\"8124\\\">Below I expand several key subjects.<\\\/p><h2 data-start=\\\"8126\\\" data-end=\\\"8156\\\">(1) Transmission line width<\\\/h2><p data-start=\\\"8158\\\" data-end=\\\"8249\\\">Transmission line width in high-frequency PCB design must follow impedance matching theory.<\\\/p><p data-start=\\\"8251\\\" data-end=\\\"8701\\\"><strong data-start=\\\"8251\\\" data-end=\\\"8273\\\">Impedance matching<\\\/strong><br data-start=\\\"8273\\\" data-end=\\\"8276\\\" \\\/>When input\\\/output impedance and transmission line impedance match, the system gives maximum output power and minimum reflection. For microwave circuits, matching must also consider device bias points. Vias on signal lines change transmission properties. For TTL and CMOS, characteristic impedance is high, so the effect is small. But for 50 \\u03a9 low-impedance RF lines, vias must be considered. Usually avoid vias on such lines.<\\\/p><h2 data-start=\\\"8703\\\" data-end=\\\"8755\\\">(2) Crosstalk between parallel transmission lines<\\\/h2><p data-start=\\\"8757\\\" data-end=\\\"9122\\\">When two microstrip lines run close and parallel, coupling occurs. They cause crosstalk and change line characteristic impedance. Pay attention for 50 \\u03a9 and 75 \\u03a9 circuits. Designers can use coupling for some functions, such as directional couplers or power measurement. Example values from one design (1.97 GHz PCS end base station amplifier, dielectric \\u03b5r = 3.48):<\\\/p><ul data-start=\\\"9124\\\" data-end=\\\"9266\\\"><li data-start=\\\"9124\\\" data-end=\\\"9195\\\"><p data-start=\\\"9126\\\" data-end=\\\"9195\\\">For a 10 dB directional coupler: S = 5 mil, l = 920 mil, W = 53 mil<\\\/p><\\\/li><li data-start=\\\"9196\\\" data-end=\\\"9266\\\"><p data-start=\\\"9198\\\" data-end=\\\"9266\\\">For a 20 dB directional coupler: S = 35 mil, l = 920 mil, W = 62 mil<\\\/p><\\\/li><\\\/ul><p data-start=\\\"9268\\\" data-end=\\\"9308\\\">To reduce crosstalk, follow these rules:<\\\/p><p data-start=\\\"9310\\\" data-end=\\\"9556\\\">A. Keep spacing S between high-frequency or high-speed parallel lines at least one line width.<br data-start=\\\"9404\\\" data-end=\\\"9407\\\" \\\/>B. Cut down parallel length where possible.<br data-start=\\\"9450\\\" data-end=\\\"9453\\\" \\\/>C. Keep tiny high-frequency signals away from power and logic lines that can cause strong interference.<\\\/p><h2 data-start=\\\"9558\\\" data-end=\\\"9600\\\">(3) Ground via electromagnetic analysis<\\\/h2><p data-start=\\\"9602\\\" data-end=\\\"10021\\\">For IC ground pins or other ground pins, put ground vias close to pins in high-frequency circuits. The idea: a short ground path acts like an inductive impedance. Ground via also looks inductive. This affects filter function. That is why place ground vias close to pins. To reduce inductive load, use more ground vias than in low-frequency boards. This raises ground current capacity and helps keep all points near 0 V.<\\\/p><h2 data-start=\\\"10023\\\" data-end=\\\"10045\\\">(4) Power filtering<\\\/h2><p data-start=\\\"10047\\\" data-end=\\\"10529\\\">For TTL and CMOS, designers add bypass capacitors near power pins to reduce logic noise. For high-frequency and microwave circuits, this is not enough. High-frequency signals make high-frequency interference on power. Use series inductors and capacitors. Choose inductors by working frequency. Example: to filter &gt;1 MHz noise with C = 0.1 \\u03bcF, pick L = 1 \\u03bcH. When adding inductance on collector open-circuit signal pins, be careful. The inductor acts like a matching inductance then.<\\\/p><h2 data-start=\\\"10531\\\" data-end=\\\"10547\\\">(5) Shielding<\\\/h2><p data-start=\\\"10549\\\" data-end=\\\"10680\\\">Use shielding to protect small or high-frequency signals. This reduces strong signal interference and reduces EMI. Some guidelines:<\\\/p><p data-start=\\\"10682\\\" data-end=\\\"10902\\\">A. In low frequency digital\\\/analog (&lt;30 MHz) small-signal designs, split digital and analog grounds, and pour ground plane in small-signal zones. Keep distance between ground pour and traces greater than the trace width.<\\\/p><p data-start=\\\"10904\\\" data-end=\\\"11021\\\">B. In high-frequency digital\\\/analog small-signal design, add shielding cans or stitched ground vias to isolate areas.<\\\/p><p data-start=\\\"10904\\\" data-end=\\\"11021\\\"><img class=\\\"alignnone size-full wp-image-2729\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/Isola-PCB.webp\\\" alt=\\\"Isola-PCB\\\" width=\\\"600\\\" height=\\\"449\\\" \\\/><\\\/p><p data-start=\\\"11023\\\" data-end=\\\"11245\\\">C. For high-power high-frequency circuits, make the high-frequency part a separate functional module and add a metal shield box to lower radiation. For example, optical fiber transceiver modules at 155 M, 622 M, or 2 Gb\\\/s.<\\\/p><p data-start=\\\"11247\\\" data-end=\\\"11435\\\">A multi-layer PCB for mobile phone (example: Nokia 6110) may place components on both sides and use internal ground pours as shown in the original figure. (Figure references omitted here.)<\\\/p><hr data-start=\\\"11437\\\" data-end=\\\"11440\\\" \\\/><h1 data-start=\\\"11442\\\" data-end=\\\"11490\\\">Examples of Material Selection for High Boards<\\\/h1><p data-start=\\\"11492\\\" data-end=\\\"11548\\\">Below are examples from boards we designed and debugged:<\\\/p><div class=\\\"_tableContainer_sk2ct_1\\\"><div class=\\\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\\\" tabindex=\\\"-1\\\"><table class=\\\"w-fit min-w-(--thread-content-width)\\\" data-start=\\\"11550\\\" data-end=\\\"12491\\\"><thead data-start=\\\"11550\\\" data-end=\\\"11608\\\"><tr data-start=\\\"11550\\\" data-end=\\\"11608\\\"><th data-start=\\\"11550\\\" data-end=\\\"11580\\\" data-col-size=\\\"sm\\\">Application (freq \\\/ device)<\\\/th><th data-start=\\\"11580\\\" data-end=\\\"11599\\\" data-col-size=\\\"md\\\">Material \\\/ Stack<\\\/th><th data-start=\\\"11599\\\" data-end=\\\"11608\\\" data-col-size=\\\"md\\\">Notes<\\\/th><\\\/tr><\\\/thead><tbody data-start=\\\"11624\\\" data-end=\\\"12491\\\"><tr data-start=\\\"11624\\\" data-end=\\\"11797\\\"><td data-start=\\\"11624\\\" data-end=\\\"11656\\\" data-col-size=\\\"sm\\\">2.4 GHz spread spectrum relay<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11656\\\" data-end=\\\"11700\\\">FR-4, 4-layer PCB with large ground pours<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11700\\\" data-end=\\\"11797\\\">High-frequency analog part separated. Power lines use inductors to isolate from digital part.<\\\/td><\\\/tr><tr data-start=\\\"11798\\\" data-end=\\\"11939\\\"><td data-start=\\\"11798\\\" data-end=\\\"11823\\\" data-col-size=\\\"sm\\\">2.4 GHz RF transceiver<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11823\\\" data-end=\\\"11859\\\">PTFE material, double-sided board<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11859\\\" data-end=\\\"11939\\\">RF transmit and receive in separate metal shield cans; power input filtered.<\\\/td><\\\/tr><tr data-start=\\\"11940\\\" data-end=\\\"12035\\\"><td data-start=\\\"11940\\\" data-end=\\\"11965\\\" data-col-size=\\\"sm\\\">1.9 GHz RF transceiver<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11965\\\" data-end=\\\"11994\\\">PTFE material, 4-layer PCB<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"11994\\\" data-end=\\\"12035\\\">Use large ground pours and shielding.<\\\/td><\\\/tr><tr data-start=\\\"12036\\\" data-end=\\\"12123\\\"><td data-start=\\\"12036\\\" data-end=\\\"12061\\\" data-col-size=\\\"sm\\\">140 MHz IF transceiver<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12061\\\" data-end=\\\"12086\\\">Top layer S1139 0.3 mm<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12086\\\" data-end=\\\"12123\\\">Large ground pour; via isolation.<\\\/td><\\\/tr><tr data-start=\\\"12124\\\" data-end=\\\"12223\\\"><td data-start=\\\"12124\\\" data-end=\\\"12148\\\" data-col-size=\\\"sm\\\">70 MHz IF transceiver<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12148\\\" data-end=\\\"12168\\\">FR-4, 4-layer PCB<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12168\\\" data-end=\\\"12223\\\">Large ground pour; module isolation via via fences.<\\\/td><\\\/tr><tr data-start=\\\"12224\\\" data-end=\\\"12385\\\"><td data-start=\\\"12224\\\" data-end=\\\"12247\\\" data-col-size=\\\"sm\\\">30 W power amplifier<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12247\\\" data-end=\\\"12283\\\">RO4350 material, double-sided PCB<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12283\\\" data-end=\\\"12385\\\">Large ground pour; spacing controlled to &gt;= 50 \\u03a9 line width; shield box and power input filtering.<\\\/td><\\\/tr><tr data-start=\\\"12386\\\" data-end=\\\"12491\\\"><td data-start=\\\"12386\\\" data-end=\\\"12414\\\" data-col-size=\\\"sm\\\">2000 MHz microwave source<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12414\\\" data-end=\\\"12433\\\">S1139 0.8 mm top<\\\/td><td data-col-size=\\\"md\\\" data-start=\\\"12433\\\" data-end=\\\"12491\\\">Double-sided PCB; precise control of trace dimensions.<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div><p data-start=\\\"12493\\\" data-end=\\\"12573\\\">Use these as examples. Each project needs its own material and thickness choice.<\\\/p><hr data-start=\\\"12575\\\" data-end=\\\"12578\\\" \\\/><h1 data-start=\\\"12580\\\" data-end=\\\"12622\\\">High-Frequency PCB Material Requirements<\\\/h1><p data-start=\\\"12624\\\" data-end=\\\"12677\\\">Designers should check these key material properties:<\\\/p><ol data-start=\\\"12679\\\" data-end=\\\"13167\\\"><li data-start=\\\"12679\\\" data-end=\\\"12784\\\"><p data-start=\\\"12682\\\" data-end=\\\"12784\\\"><strong data-start=\\\"12682\\\" data-end=\\\"12720\\\">Dielectric loss (Df, loss tangent)<\\\/strong> must be very small. Small loss means less signal attenuation.<\\\/p><\\\/li><li data-start=\\\"12785\\\" data-end=\\\"12884\\\"><p data-start=\\\"12788\\\" data-end=\\\"12884\\\"><strong data-start=\\\"12788\\\" data-end=\\\"12812\\\">Low water absorption<\\\/strong> is important. High water uptake changes dielectric constant and loss.<\\\/p><\\\/li><li data-start=\\\"12885\\\" data-end=\\\"13021\\\"><p data-start=\\\"12888\\\" data-end=\\\"13021\\\"><strong data-start=\\\"12888\\\" data-end=\\\"12916\\\">Dielectric constant (DK)<\\\/strong> must be low and stable. Lower DK gives higher signal speed. DK stability also helps impedance control.<\\\/p><\\\/li><li data-start=\\\"13022\\\" data-end=\\\"13167\\\"><p data-start=\\\"13025\\\" data-end=\\\"13167\\\"><strong data-start=\\\"13025\\\" data-end=\\\"13050\\\">CTE and thermal match<\\\/strong> between copper foil and base must be similar. Large mismatch over temperature changes can cause copper delamination.<\\\/p><\\\/li><\\\/ol><p data-start=\\\"13169\\\" data-end=\\\"13256\\\">High frequency often means use of fluoropolymer substrates like PTFE (known as Teflon).<\\\/p><hr data-start=\\\"13258\\\" data-end=\\\"13261\\\" \\\/><h1 data-start=\\\"13263\\\" data-end=\\\"13321\\\">Manufacturing Notes and Cautions for High-Frequency PCBs<\\\/h1><ol data-start=\\\"13323\\\" data-end=\\\"13843\\\"><li data-start=\\\"13323\\\" data-end=\\\"13424\\\"><p data-start=\\\"13326\\\" data-end=\\\"13424\\\"><strong data-start=\\\"13326\\\" data-end=\\\"13358\\\">Impedance control is strict.<\\\/strong> Line width tolerance is tight. Typical control tolerance ~ \\u00b12%.<\\\/p><\\\/li><li data-start=\\\"13425\\\" data-end=\\\"13580\\\"><p data-start=\\\"13428\\\" data-end=\\\"13580\\\"><strong data-start=\\\"13428\\\" data-end=\\\"13473\\\">PTH adhesion is low on special materials.<\\\/strong> Use plasma surface roughening for holes and surfaces to increase adhesion for plating and solder resist.<\\\/p><\\\/li><li data-start=\\\"13581\\\" data-end=\\\"13711\\\"><p data-start=\\\"13584\\\" data-end=\\\"13711\\\"><strong data-start=\\\"13584\\\" data-end=\\\"13627\\\">Do not sand the board before soldering.<\\\/strong> This reduces adhesion. Use micro-etch solutions or other roughening methods only.<\\\/p><\\\/li><li data-start=\\\"13712\\\" data-end=\\\"13843\\\"><p data-start=\\\"13715\\\" data-end=\\\"13843\\\"><strong data-start=\\\"13715\\\" data-end=\\\"13783\\\">PTFE boards often cause rough edges with standard milling tools.<\\\/strong> Use special milling bits and follow PTFE routing practices.<\\\/p><\\\/li><\\\/ol><hr data-start=\\\"13845\\\" data-end=\\\"13848\\\" \\\/><h1 data-start=\\\"13850\\\" data-end=\\\"13868\\\">Short Conclusion<\\\/h1><p data-start=\\\"13870\\\" data-end=\\\"14235\\\">High-frequency PCBs need special materials and careful process control. Choose a material that fits your frequency and thermal needs. Control impedance and place ground vias closely. Use shielding and correct power filtering. Follow special handling steps for PTFE and other microwave laminates. 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class=\\\"elementor-element elementor-element-2fe9c4e e-flex e-con-boxed e-con e-parent\\\" data-id=\\\"2fe9c4e\\\" data-element_type=\\\"container\\\">\\n\\t\\t\\t\\t\\t<div class=\\\"e-con-inner\\\">\\n\\t\\t[elementor-element k=\\\"0e46bd9387093ca73b9000e38f18cce4\\\" data=\\\"{"id":"f058cdb","elType":"widget","settings":{"editor":"<h2 data-start=\"315\" data-end=\"345\">What Is a High-Frequency PCB<\/h2><p data-start=\"347\" data-end=\"753\">A<a href=\"https:\/\/en.wikipedia.org\/wiki\/Printed_circuit_board#High_frequency_PCBs\"> high-frequency PCB<\/a> is a special printed circuit board (PCB) used for high electromagnetic frequency signals. These boards are for radio frequencies above about 300 MHz (wavelength &lt; 1 m) and for microwave frequencies above about 3 GHz (wavelength &lt; 0.1 m). They are made on microwave base copper clad laminates. Production may use some standard rigid PCB steps or use special methods for these materials.<\/p><p data-start=\"347\" data-end=\"753\"><img class=\"alignnone size-full wp-image-2728\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/High-Frequency-PCB.webp\" alt=\"High-Frequency PCB\" width=\"600\" height=\"372\" \/><\/p><p data-start=\"755\" data-end=\"1165\">With fast progress in technology, more devices work in the microwave band (&gt;1 GHz) and even in millimeter wave ranges (&gt;30 GHz). This means frequencies rise and material needs increase. Base materials must have very good electrical properties and good chemical stability. As the signal frequency goes up, material loss must stay very low. With the arrival of 5G, high-frequency materials became more important.<\/p><hr data-start=\"1167\" data-end=\"1170\" \/><h1 data-start=\"1172\" data-end=\"1207\">Advantages of High-Frequency PCBs<\/h1><p data-start=\"1209\" data-end=\"1430\"><strong data-start=\"1209\" data-end=\"1231\">1. High efficiency<\/strong><br data-start=\"1231\" data-end=\"1234\" \/>Materials with low dielectric constant cause low loss. Modern induction heating and other methods can hit targets and keep high efficiency. These boards also help reduce waste and fit green goals.<\/p><p data-start=\"1432\" data-end=\"1677\"><strong data-start=\"1432\" data-end=\"1449\">2. High speed<\/strong><br data-start=\"1449\" data-end=\"1452\" \/>Signal speed is inversely proportional to the square root of the dielectric constant. Lower dielectric constant means faster transmission. Special materials keep dielectric constant low and stable. This helps signal transfer.<\/p><p data-start=\"1679\" data-end=\"1970\"><strong data-start=\"1679\" data-end=\"1723\">3. Good control of heating or processing<\/strong><br data-start=\"1723\" data-end=\"1726\" \/>High-frequency boards are used in many fields that need precise heating of metal parts. You can control how deep or where to heat. You can focus on surface or deep heating. You can heat in a focused or spread way. The board allows fine control.<\/p><p data-start=\"1972\" data-end=\"2316\"><strong data-start=\"1972\" data-end=\"1996\">4. Strong durability<\/strong><br data-start=\"1996\" data-end=\"1999\" \/>Dielectric constant and dielectric material depend on environment. In humid areas, moisture hurts boards. High-frequency boards made from low water absorption material resist this. They resist chemical corrosion, moisture, high heat, and have high peel strength. These qualities make them strong in hard environments.<\/p><hr data-start=\"2318\" data-end=\"2321\" \/><h1 data-start=\"2323\" data-end=\"2375\">Common High-Frequency and High-Speed PCB Materials<\/h1><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"2377\" data-end=\"2727\"><thead data-start=\"2377\" data-end=\"2419\"><tr data-start=\"2377\" data-end=\"2419\"><th data-start=\"2377\" data-end=\"2393\" data-col-size=\"sm\">Brand \/ Maker<\/th><th data-start=\"2393\" data-end=\"2419\" data-col-size=\"md\">Typical Series \/ Types<\/th><\/tr><\/thead><tbody data-start=\"2430\" data-end=\"2727\"><tr data-start=\"2430\" data-end=\"2473\"><td data-start=\"2430\" data-end=\"2439\" data-col-size=\"sm\">Rogers<\/td><td data-col-size=\"md\" data-start=\"2439\" data-end=\"2473\">RO4003, RO3003, RO4350, RO5880<\/td><\/tr><tr data-start=\"2474\" data-end=\"2537\"><td data-start=\"2474\" data-end=\"2509\" data-col-size=\"sm\">TUC (Taiyao \/ TaYa or TUC brand)<\/td><td data-col-size=\"md\" data-start=\"2509\" data-end=\"2537\">TUC862, 872SLK, 883, 933<\/td><\/tr><tr data-start=\"2538\" data-end=\"2574\"><td data-start=\"2538\" data-end=\"2550\" data-col-size=\"sm\">Panasonic<\/td><td data-col-size=\"md\" data-start=\"2550\" data-end=\"2574\">Megtron 4, Megtron 6<\/td><\/tr><tr data-start=\"2575\" data-end=\"2608\"><td data-start=\"2575\" data-end=\"2583\" data-col-size=\"sm\">Isola<\/td><td data-col-size=\"md\" data-start=\"2583\" data-end=\"2608\">FR408HR, IS620, IS680<\/td><\/tr><tr data-start=\"2609\" data-end=\"2643\"><td data-start=\"2609\" data-end=\"2617\" data-col-size=\"sm\">Nelco<\/td><td data-start=\"2617\" data-end=\"2643\" data-col-size=\"md\">N4000-13, N4000-13EPSI<\/td><\/tr><tr data-start=\"2644\" data-end=\"2727\"><td data-start=\"2644\" data-end=\"2670\" data-col-size=\"sm\">Domestic makers (China)<\/td><td data-col-size=\"md\" data-start=\"2670\" data-end=\"2727\">Dongguan Shengyi, Taizhou Wangling, Taixing Microwave<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"2729\" data-end=\"2849\">(Use these example materials as a starting point. Each design needs the right material choice for frequency and layout.)<\/p><hr data-start=\"2851\" data-end=\"2854\" \/><h1 data-start=\"2856\" data-end=\"2913\">Difference Between High-Frequency Boards and HDI Boards<\/h1><p data-start=\"2915\" data-end=\"3218\">High-frequency PCBs are for radar, test instruments, automotive collision-avoidance systems, communication satellites, wireless systems, and other fields. HDI (High Density Interconnect) boards are for small devices with many components. HDI often uses double-sided boards in products with small volume.<\/p><p data-start=\"3220\" data-end=\"3555\">A high-frequency board needs very high process control and precision. Many times designers start from FR-4 glass epoxy, but true high-frequency boards use special laminates. The board must have a small and stable dielectric constant, low dielectric loss, low water absorption, high temperature tolerance, and good corrosion resistance.<\/p><p data-start=\"3557\" data-end=\"3824\">An HDI board uses micro blind vias to reach high routing density. It has internal and external routing that connect by drilling and plating. HDI is for compact products. Some HDI designs use modular parallel modules and strong DSP control for power and load features.<\/p><hr data-start=\"3826\" data-end=\"3829\" \/><h1 data-start=\"3831\" data-end=\"3880\">Types \/ Classification of High-Frequency Boards<\/h1><p data-start=\"3882\" data-end=\"3938\">Below are common types and notes about their processing:<\/p><p data-start=\"3940\" data-end=\"3989\"><strong data-start=\"3940\" data-end=\"3987\">1. Powder-filled thermoset (ceramic filled)<\/strong><\/p><ul data-start=\"3990\" data-end=\"4260\"><li data-start=\"3990\" data-end=\"4078\"><p data-start=\"3992\" data-end=\"4078\">Materials and suppliers: Rogers 4350B \/ 4003C; Arlon 25N \/ 25FR; Taconic TLG series.<img class=\"size-full wp-image-2730 aligncenter\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-4350b.webp\" alt=\"Rogers 4350b\" width=\"600\" height=\"308\" \/><\/p><\/li><li data-start=\"4079\" data-end=\"4260\"><p data-start=\"4081\" data-end=\"4260\">Processing: Steps are similar to FR-4 epoxy glass laminates. However, boards are brittle and easy to break. Tool life for drills and router bits drops about 20%. Handle with care.<\/p><\/li><\/ul><p data-start=\"4262\" data-end=\"4309\"><strong data-start=\"4262\" data-end=\"4307\">2. PTFE (polytetrafluoroethylene, Teflon)<\/strong><\/p><ul data-start=\"4310\" data-end=\"5232\"><li data-start=\"4310\" data-end=\"4539\"><p data-start=\"4312\" data-end=\"4338\">Materials and suppliers:<\/p><ul data-start=\"4341\" data-end=\"4539\"><li data-start=\"4341\" data-end=\"4389\"><p data-start=\"4343\" data-end=\"4389\">Rogers: RO3000 series, RT series, TMM series<img class=\"alignnone size-full wp-image-2731\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Rogers-RO3003.webp\" alt=\"Rogers RO3003\" width=\"600\" height=\"450\" \/><\/p><\/li><li data-start=\"4392\" data-end=\"4439\"><p data-start=\"4394\" data-end=\"4439\">Arlon: AD\/AR series, IsoClad, CuClad series<\/p><\/li><li data-start=\"4442\" data-end=\"4488\"><p data-start=\"4444\" data-end=\"4488\">Taconic: RF series, TLX series, TLY series<\/p><\/li><li data-start=\"4491\" data-end=\"4539\"><p data-start=\"4493\" data-end=\"4539\">Taixing Microwave: F4B \/ F4BM \/ F4BK \/ TP-2B<\/p><\/li><\/ul><\/li><li data-start=\"4540\" data-end=\"5232\"><p data-start=\"4542\" data-end=\"4570\">Processing notes for PTFE:<\/p><ul data-start=\"4573\" data-end=\"5232\"><li data-start=\"4573\" data-end=\"4657\"><p data-start=\"4575\" data-end=\"4657\">Keep protective film when cutting raw sheets to avoid scratches and press marks.<\/p><\/li><li data-start=\"4660\" data-end=\"4791\"><p data-start=\"4662\" data-end=\"4791\">Use new drills (standard #130 drills recommended). For best results, drill one sheet at a time. Keep clamp pressure at ~40 psi.<\/p><\/li><li data-start=\"4794\" data-end=\"4872\"><p data-start=\"4796\" data-end=\"4872\">Use aluminum backstop and 1 mm melamine pads to hold PTFE during drilling.<\/p><\/li><li data-start=\"4875\" data-end=\"4931\"><p data-start=\"4877\" data-end=\"4931\">After drilling, blow dust out of holes with hot air.<\/p><\/li><li data-start=\"4934\" data-end=\"5044\"><p data-start=\"4936\" data-end=\"5044\">Use a stable drill machine. For small holes, increase speed and reduce chip load and spindle return speed.<\/p><\/li><li data-start=\"5047\" data-end=\"5155\"><p data-start=\"5049\" data-end=\"5155\">Hole surface treatment: low-temperature plasma or sodium naphthalene activation help hole metallization.<\/p><\/li><li data-start=\"5158\" data-end=\"5232\"><p data-start=\"5160\" data-end=\"5232\">PTH (plated through hole) copper deposition and adhesion need attention.<\/p><\/li><\/ul><\/li><\/ul><p data-start=\"5234\" data-end=\"5264\"><strong data-start=\"5234\" data-end=\"5262\">3. PTH copper deposition<\/strong><\/p><ul data-start=\"5265\" data-end=\"5384\"><li data-start=\"5265\" data-end=\"5384\"><p data-start=\"5267\" data-end=\"5384\">After micro-etch (~20 microinch control), perform PTH. If needed, run a second PTH pass as required by board routing.<\/p><\/li><\/ul><p data-start=\"5386\" data-end=\"5427\"><strong data-start=\"5386\" data-end=\"5425\">4. Solder mask (green mask) process<\/strong><\/p><ul data-start=\"5428\" data-end=\"5701\"><li data-start=\"5428\" data-end=\"5498\"><p data-start=\"5430\" data-end=\"5498\">Pre-process: use acid\/alkaline cleaning; avoid mechanical sanding.<\/p><\/li><li data-start=\"5499\" data-end=\"5574\"><p data-start=\"5501\" data-end=\"5574\">After pre-process, bake the board (90\u00b0C for 30 min) and apply dry film.<\/p><\/li><li data-start=\"5575\" data-end=\"5701\"><p data-start=\"5577\" data-end=\"5701\">Bake in three stages: 80\u00b0C, 100\u00b0C, 150\u00b0C, 30 min each. If mask shows oil spots, remove mask and repeat activation treatment.<\/p><\/li><\/ul><p data-start=\"5703\" data-end=\"5741\"><strong data-start=\"5703\" data-end=\"5739\">5. Routing \/ milling PTFE boards<\/strong><\/p><ul data-start=\"5742\" data-end=\"6038\"><li data-start=\"5742\" data-end=\"5835\"><p data-start=\"5744\" data-end=\"5835\">Use thin paper on PTFE trace side and clamp with FR-4 or phenolic backing during routing.<\/p><\/li><li data-start=\"5836\" data-end=\"6038\"><p data-start=\"5838\" data-end=\"6038\">After routing, hand-finish edge burrs and inspect carefully. Avoid damaging copper and board surface. Use sulfur-free separation paper. Reduce burrs well. The routing step must leave good edge finish.<\/p><\/li><\/ul><hr data-start=\"6040\" data-end=\"6043\" \/><h1 data-start=\"6045\" data-end=\"6093\">Production Flow for High-Frequency PTFE Boards<\/h1><p data-start=\"6095\" data-end=\"6167\">Below are three common process flows. I put them in a table for clarity.<\/p><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"6169\" data-end=\"6917\"><thead data-start=\"6169\" data-end=\"6207\"><tr data-start=\"6169\" data-end=\"6207\"><th data-start=\"6169\" data-end=\"6184\" data-col-size=\"sm\">Process Type<\/th><th data-start=\"6184\" data-end=\"6207\" data-col-size=\"xl\">Key Steps (summary)<\/th><\/tr><\/thead><tbody data-start=\"6218\" data-end=\"6917\"><tr data-start=\"6218\" data-end=\"6482\"><td data-start=\"6218\" data-end=\"6260\" data-col-size=\"sm\">NPTH (Non-Plated Through Hole) for PTFE<\/td><td data-col-size=\"xl\" data-start=\"6260\" data-end=\"6482\">Cutting \u2192 Drilling \u2192 Dry film \u2192 Inspection \u2192 Etch \u2192 Etch inspection \u2192 Solder mask \u2192 Dry film exposure \u2192 Hot air solder leveling (HASL) or tin spray \u2192 Routing\/shaping \u2192 Inspection \u2192 Final inspection \u2192 Packing \u2192 Delivery<\/td><\/tr><tr data-start=\"6483\" data-end=\"6822\"><td data-start=\"6483\" data-end=\"6520\" data-col-size=\"sm\">PTH (Plated Through Hole) for PTFE<\/td><td data-col-size=\"xl\" data-start=\"6520\" data-end=\"6822\">Cutting \u2192 Drilling \u2192 Hole treatment (low-temp plasma or sodium naphthalene activation) \u2192 Copper plating \u2192 Panel electrical test \u2192 Dry film \u2192 Inspection \u2192 Imaging \u2192 Etch \u2192 Etch inspection \u2192 Solder mask \u2192 Dry film exposure \u2192 HASL \u2192 Routing\/shaping \u2192 Inspection \u2192 Final inspection \u2192 Packing \u2192 Delivery<\/td><\/tr><tr data-start=\"6823\" data-end=\"6917\"><td data-start=\"6823\" data-end=\"6854\" data-col-size=\"sm\">Solder mask process controls<\/td><td data-col-size=\"xl\" data-start=\"6854\" data-end=\"6917\">Control green mask adhesion and bubble formation carefully.<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"6919\" data-end=\"6999\">Note: Each process step must control surface scratch and other defects strictly.<\/p><hr data-start=\"7001\" data-end=\"7004\" \/><h1 data-start=\"7006\" data-end=\"7043\">Applications of High-Frequency PCBs<\/h1><p data-start=\"7045\" data-end=\"7084\">High-frequency PCBs commonly appear in:<\/p><ul data-start=\"7086\" data-end=\"7468\"><li data-start=\"7086\" data-end=\"7137\"><p data-start=\"7088\" data-end=\"7137\">Power amplifiers and low noise amplifiers (LNA)<\/p><\/li><li data-start=\"7138\" data-end=\"7198\"><p data-start=\"7140\" data-end=\"7198\">Mobile communication products and smart lighting systems<\/p><\/li><li data-start=\"7199\" data-end=\"7273\"><p data-start=\"7201\" data-end=\"7273\">Power dividers, couplers, duplexers, filters and other passive devices<\/p><\/li><li data-start=\"7274\" data-end=\"7366\"><p data-start=\"7276\" data-end=\"7366\">Automotive collision avoidance systems, communication satellites, wireless phone systems<\/p><\/li><li data-start=\"7367\" data-end=\"7468\"><p data-start=\"7369\" data-end=\"7468\">In short, electronics are moving to higher frequencies and high-frequency boards follow this trend.<\/p><\/li><\/ul><hr data-start=\"7470\" data-end=\"7473\" \/><h1 data-start=\"7475\" data-end=\"7510\">How to Design High-Frequency PCBs<\/h1><p data-start=\"7512\" data-end=\"7840\">In high-frequency PCB design, power plane layout is critical. Usually put power on its own layer. This helps the circuit follow the path of least impedance. Power plane must provide return paths for all signals on the PCB. That lowers loop area and reduces noise. Low-frequency designers often ignore some of these noise issues.<\/p><p data-start=\"7842\" data-end=\"7890\">Follow these rules in high-frequency PCB design:<\/p><ul data-start=\"7892\" data-end=\"8086\"><li data-start=\"7892\" data-end=\"7937\"><p data-start=\"7894\" data-end=\"7937\">Keep power and ground stable and unified.<\/p><\/li><li data-start=\"7938\" data-end=\"8001\"><p data-start=\"7940\" data-end=\"8001\">Careful routing and correct termination remove reflections.<\/p><\/li><li data-start=\"8002\" data-end=\"8086\"><p data-start=\"8004\" data-end=\"8086\">Careful routing and correct termination reduce capacitance and measured crosstalk.<\/p><\/li><\/ul><p data-start=\"8088\" data-end=\"8124\">Below I expand several key subjects.<\/p><h2 data-start=\"8126\" data-end=\"8156\">(1) Transmission line width<\/h2><p data-start=\"8158\" data-end=\"8249\">Transmission line width in high-frequency PCB design must follow impedance matching theory.<\/p><p data-start=\"8251\" data-end=\"8701\"><strong data-start=\"8251\" data-end=\"8273\">Impedance matching<\/strong><br data-start=\"8273\" data-end=\"8276\" \/>When input\/output impedance and transmission line impedance match, the system gives maximum output power and minimum reflection. For microwave circuits, matching must also consider device bias points. Vias on signal lines change transmission properties. For TTL and CMOS, characteristic impedance is high, so the effect is small. But for 50 \u03a9 low-impedance RF lines, vias must be considered. Usually avoid vias on such lines.<\/p><h2 data-start=\"8703\" data-end=\"8755\">(2) Crosstalk between parallel transmission lines<\/h2><p data-start=\"8757\" data-end=\"9122\">When two microstrip lines run close and parallel, coupling occurs. They cause crosstalk and change line characteristic impedance. Pay attention for 50 \u03a9 and 75 \u03a9 circuits. Designers can use coupling for some functions, such as directional couplers or power measurement. Example values from one design (1.97 GHz PCS end base station amplifier, dielectric \u03b5r = 3.48):<\/p><ul data-start=\"9124\" data-end=\"9266\"><li data-start=\"9124\" data-end=\"9195\"><p data-start=\"9126\" data-end=\"9195\">For a 10 dB directional coupler: S = 5 mil, l = 920 mil, W = 53 mil<\/p><\/li><li data-start=\"9196\" data-end=\"9266\"><p data-start=\"9198\" data-end=\"9266\">For a 20 dB directional coupler: S = 35 mil, l = 920 mil, W = 62 mil<\/p><\/li><\/ul><p data-start=\"9268\" data-end=\"9308\">To reduce crosstalk, follow these rules:<\/p><p data-start=\"9310\" data-end=\"9556\">A. Keep spacing S between high-frequency or high-speed parallel lines at least one line width.<br data-start=\"9404\" data-end=\"9407\" \/>B. Cut down parallel length where possible.<br data-start=\"9450\" data-end=\"9453\" \/>C. Keep tiny high-frequency signals away from power and logic lines that can cause strong interference.<\/p><h2 data-start=\"9558\" data-end=\"9600\">(3) Ground via electromagnetic analysis<\/h2><p data-start=\"9602\" data-end=\"10021\">For IC ground pins or other ground pins, put ground vias close to pins in high-frequency circuits. The idea: a short ground path acts like an inductive impedance. Ground via also looks inductive. This affects filter function. That is why place ground vias close to pins. To reduce inductive load, use more ground vias than in low-frequency boards. This raises ground current capacity and helps keep all points near 0 V.<\/p><h2 data-start=\"10023\" data-end=\"10045\">(4) Power filtering<\/h2><p data-start=\"10047\" data-end=\"10529\">For TTL and CMOS, designers add bypass capacitors near power pins to reduce logic noise. For high-frequency and microwave circuits, this is not enough. High-frequency signals make high-frequency interference on power. Use series inductors and capacitors. Choose inductors by working frequency. Example: to filter &gt;1 MHz noise with C = 0.1 \u03bcF, pick L = 1 \u03bcH. When adding inductance on collector open-circuit signal pins, be careful. The inductor acts like a matching inductance then.<\/p><h2 data-start=\"10531\" data-end=\"10547\">(5) Shielding<\/h2><p data-start=\"10549\" data-end=\"10680\">Use shielding to protect small or high-frequency signals. This reduces strong signal interference and reduces EMI. Some guidelines:<\/p><p data-start=\"10682\" data-end=\"10902\">A. In low frequency digital\/analog (&lt;30 MHz) small-signal designs, split digital and analog grounds, and pour ground plane in small-signal zones. Keep distance between ground pour and traces greater than the trace width.<\/p><p data-start=\"10904\" data-end=\"11021\">B. In high-frequency digital\/analog small-signal design, add shielding cans or stitched ground vias to isolate areas.<\/p><p data-start=\"10904\" data-end=\"11021\"><img class=\"alignnone size-full wp-image-2729\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/Isola-PCB.webp\" alt=\"Isola-PCB\" width=\"600\" height=\"449\" \/><\/p><p data-start=\"11023\" data-end=\"11245\">C. For high-power high-frequency circuits, make the high-frequency part a separate functional module and add a metal shield box to lower radiation. For example, optical fiber transceiver modules at 155 M, 622 M, or 2 Gb\/s.<\/p><p data-start=\"11247\" data-end=\"11435\">A multi-layer PCB for mobile phone (example: Nokia 6110) may place components on both sides and use internal ground pours as shown in the original figure. (Figure references omitted here.)<\/p><hr data-start=\"11437\" data-end=\"11440\" \/><h1 data-start=\"11442\" data-end=\"11490\">Examples of Material Selection for High Boards<\/h1><p data-start=\"11492\" data-end=\"11548\">Below are examples from boards we designed and debugged:<\/p><div class=\"_tableContainer_sk2ct_1\"><div class=\"_tableWrapper_sk2ct_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"11550\" data-end=\"12491\"><thead data-start=\"11550\" data-end=\"11608\"><tr data-start=\"11550\" data-end=\"11608\"><th data-start=\"11550\" data-end=\"11580\" data-col-size=\"sm\">Application (freq \/ device)<\/th><th data-start=\"11580\" data-end=\"11599\" data-col-size=\"md\">Material \/ Stack<\/th><th data-start=\"11599\" data-end=\"11608\" data-col-size=\"md\">Notes<\/th><\/tr><\/thead><tbody data-start=\"11624\" data-end=\"12491\"><tr data-start=\"11624\" data-end=\"11797\"><td data-start=\"11624\" data-end=\"11656\" data-col-size=\"sm\">2.4 GHz spread spectrum relay<\/td><td data-col-size=\"md\" data-start=\"11656\" data-end=\"11700\">FR-4, 4-layer PCB with large ground pours<\/td><td data-col-size=\"md\" data-start=\"11700\" data-end=\"11797\">High-frequency analog part separated. Power lines use inductors to isolate from digital part.<\/td><\/tr><tr data-start=\"11798\" data-end=\"11939\"><td data-start=\"11798\" data-end=\"11823\" data-col-size=\"sm\">2.4 GHz RF transceiver<\/td><td data-col-size=\"md\" data-start=\"11823\" data-end=\"11859\">PTFE material, double-sided board<\/td><td data-col-size=\"md\" data-start=\"11859\" data-end=\"11939\">RF transmit and receive in separate metal shield cans; power input filtered.<\/td><\/tr><tr data-start=\"11940\" data-end=\"12035\"><td data-start=\"11940\" data-end=\"11965\" data-col-size=\"sm\">1.9 GHz RF transceiver<\/td><td data-col-size=\"md\" data-start=\"11965\" data-end=\"11994\">PTFE material, 4-layer PCB<\/td><td data-col-size=\"md\" data-start=\"11994\" data-end=\"12035\">Use large ground pours and shielding.<\/td><\/tr><tr data-start=\"12036\" data-end=\"12123\"><td data-start=\"12036\" data-end=\"12061\" data-col-size=\"sm\">140 MHz IF transceiver<\/td><td data-col-size=\"md\" data-start=\"12061\" data-end=\"12086\">Top layer S1139 0.3 mm<\/td><td data-col-size=\"md\" data-start=\"12086\" data-end=\"12123\">Large ground pour; via isolation.<\/td><\/tr><tr data-start=\"12124\" data-end=\"12223\"><td data-start=\"12124\" data-end=\"12148\" data-col-size=\"sm\">70 MHz IF transceiver<\/td><td data-col-size=\"md\" data-start=\"12148\" data-end=\"12168\">FR-4, 4-layer PCB<\/td><td data-col-size=\"md\" data-start=\"12168\" data-end=\"12223\">Large ground pour; module isolation via via fences.<\/td><\/tr><tr data-start=\"12224\" data-end=\"12385\"><td data-start=\"12224\" data-end=\"12247\" data-col-size=\"sm\">30 W power amplifier<\/td><td data-col-size=\"md\" data-start=\"12247\" data-end=\"12283\">RO4350 material, double-sided PCB<\/td><td data-col-size=\"md\" data-start=\"12283\" data-end=\"12385\">Large ground pour; spacing controlled to &gt;= 50 \u03a9 line width; shield box and power input filtering.<\/td><\/tr><tr data-start=\"12386\" data-end=\"12491\"><td data-start=\"12386\" data-end=\"12414\" data-col-size=\"sm\">2000 MHz microwave source<\/td><td data-col-size=\"md\" data-start=\"12414\" data-end=\"12433\">S1139 0.8 mm top<\/td><td data-col-size=\"md\" data-start=\"12433\" data-end=\"12491\">Double-sided PCB; precise control of trace dimensions.<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"12493\" data-end=\"12573\">Use these as examples. Each project needs its own material and thickness choice.<\/p><hr data-start=\"12575\" data-end=\"12578\" \/><h1 data-start=\"12580\" data-end=\"12622\">High-Frequency PCB Material Requirements<\/h1><p data-start=\"12624\" data-end=\"12677\">Designers should check these key material properties:<\/p><ol data-start=\"12679\" data-end=\"13167\"><li data-start=\"12679\" data-end=\"12784\"><p data-start=\"12682\" data-end=\"12784\"><strong data-start=\"12682\" data-end=\"12720\">Dielectric loss (Df, loss tangent)<\/strong> must be very small. Small loss means less signal attenuation.<\/p><\/li><li data-start=\"12785\" data-end=\"12884\"><p data-start=\"12788\" data-end=\"12884\"><strong data-start=\"12788\" data-end=\"12812\">Low water absorption<\/strong> is important. High water uptake changes dielectric constant and loss.<\/p><\/li><li data-start=\"12885\" data-end=\"13021\"><p data-start=\"12888\" data-end=\"13021\"><strong data-start=\"12888\" data-end=\"12916\">Dielectric constant (DK)<\/strong> must be low and stable. Lower DK gives higher signal speed. DK stability also helps impedance control.<\/p><\/li><li data-start=\"13022\" data-end=\"13167\"><p data-start=\"13025\" data-end=\"13167\"><strong data-start=\"13025\" data-end=\"13050\">CTE and thermal match<\/strong> between copper foil and base must be similar. Large mismatch over temperature changes can cause copper delamination.<\/p><\/li><\/ol><p data-start=\"13169\" data-end=\"13256\">High frequency often means use of fluoropolymer substrates like PTFE (known as Teflon).<\/p><hr data-start=\"13258\" data-end=\"13261\" \/><h1 data-start=\"13263\" data-end=\"13321\">Manufacturing Notes and Cautions for High-Frequency PCBs<\/h1><ol data-start=\"13323\" data-end=\"13843\"><li data-start=\"13323\" data-end=\"13424\"><p data-start=\"13326\" data-end=\"13424\"><strong data-start=\"13326\" data-end=\"13358\">Impedance control is strict.<\/strong> Line width tolerance is tight. Typical control tolerance ~ \u00b12%.<\/p><\/li><li data-start=\"13425\" data-end=\"13580\"><p data-start=\"13428\" data-end=\"13580\"><strong data-start=\"13428\" data-end=\"13473\">PTH adhesion is low on special materials.<\/strong> Use plasma surface roughening for holes and surfaces to increase adhesion for plating and solder resist.<\/p><\/li><li data-start=\"13581\" data-end=\"13711\"><p data-start=\"13584\" data-end=\"13711\"><strong data-start=\"13584\" data-end=\"13627\">Do not sand the board before soldering.<\/strong> This reduces adhesion. Use micro-etch solutions or other roughening methods only.<\/p><\/li><li data-start=\"13712\" data-end=\"13843\"><p data-start=\"13715\" data-end=\"13843\"><strong data-start=\"13715\" data-end=\"13783\">PTFE boards often cause rough edges with standard milling tools.<\/strong> Use special milling bits and follow PTFE routing practices.<\/p><\/li><\/ol><hr data-start=\"13845\" data-end=\"13848\" \/><h1 data-start=\"13850\" data-end=\"13868\">Short Conclusion<\/h1><p data-start=\"13870\" data-end=\"14235\">High-frequency PCBs need special materials and careful process control. Choose a material that fits your frequency and thermal needs. Control impedance and place ground vias closely. Use shielding and correct power filtering. Follow special handling steps for PTFE and other microwave laminates. These steps improve performance and yield in high-frequency circuits.<\/p>","display_condition_list":[{"display_condition_login_status":"subscriber","_id":"18e069d"}]},"elements":[],"widgetType":"text-editor"}\\\"]\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<section class=\\\"elementor-section elementor-top-section elementor-element elementor-element-brlk2x4 elementor-section-content-top elementor-section-boxed elementor-section-height-default elementor-section-height-default\\\" data-id=\\\"brlk2x4\\\" data-element_type=\\\"section\\\" data-settings=\\\"{&quot;background_background&quot;:&quot;classic&quot;}\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-background-overlay\\\"><\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-container elementor-column-gap-no\\\">\\n\\t\\t\\t\\t\\t<div class=\\\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7882748\\\" data-id=\\\"7882748\\\" data-element_type=\\\"column\\\">\\n\\t\\t\\t<div class=\\\"elementor-widget-wrap elementor-element-populated\\\">\\n\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-element elementor-element-9fc6712 elementor-widget elementor-widget-heading\\\" data-id=\\\"9fc6712\\\" data-element_type=\\\"widget\\\" data-widget_type=\\\"heading.default\\\">\\n\\t\\t\\t\\t<div class=\\\"elementor-widget-container\\\">\\n\\t\\t\\t\\t\\t<h2 class=\\\"elementor-heading-title elementor-size-default\\\">Frequently Asked Questions<\\\/h2>\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<div class=\\\"elementor-element elementor-element-631b990 elementor-widget elementor-widget-accordion\\\" data-id=\\\"631b990\\\" data-element_type=\\\"widget\\\" data-widget_type=\\\"accordion.default\\\">\\n\\t\\t\\t\\t<div class=\\\"elementor-widget-container\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1031\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"1\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1031\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">Which substrate materials are commonly used for high-frequency PCBs?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1031\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"1\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1031\\\"><p>Typical materials include PTFE (Teflon)-based laminates and engineered composites from suppliers like Rogers (RO3000\\\/RO4000\\\/RT\\\/duroid) and Isola, chosen for low loss tangent and stable dielectric constant.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1032\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"2\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1032\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">Why not just use FR-4 for RF\\\/high-frequency designs?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1032\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"2\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1032\\\"><p>FR-4 has higher dielectric loss and less stable dielectric constant at GHz frequencies, which increases signal loss and impedance variability; for many RF or microwave applications, PTFE\\\/Rogers-class laminates perform much better.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1033\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"3\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1033\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">What electrical properties matter most (Dk, loss tangent)?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1033\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"3\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1033\\\"><p>Dielectric constant (Dk) controls impedance and signal velocity; loss tangent (Df) governs signal attenuation. Low, stable Dk and low loss tangent are essential for consistent high-frequency performance.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1034\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"4\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1034\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">Typical applications for high-frequency PCBs?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1034\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"4\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1034\\\"><p>Antennas, RF amplifiers, filters, 5G base stations, microwave radio links, satellite communications, radar, and high-speed RF modules.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1035\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"5\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1035\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">How do I choose the right high-frequency laminate?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1035\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"5\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1035\\\"><p>Match required frequency range, target impedance stability, thermal\\\/CTE needs, and loss tangent. Review supplier datasheets (Rogers, Isola, etc.) and request material test data (Dk\\\/Df vs frequency).<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/section>\\n\\t\\t\",\"scripts\":[],\"styles\":[]}}"],"_uag_css_file_name":["uag-css-1909.css"],"_uag_js_file_name":["uag-js-1909.js"]},"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"Philifast","author_link":"https:\/\/flj-pcb.com\/de_at\/author\/2475017442jygmail-com\/"},"uagb_comment_info":0,"uagb_excerpt":"What Is a High-Frequency PCB A high-frequency PCB is a special printed circuit board (PCB) used for high electromagnetic frequency [&hellip;]","_links":{"self":[{"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/pages\/1909","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/comments?post=1909"}],"version-history":[{"count":18,"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/pages\/1909\/revisions"}],"predecessor-version":[{"id":3345,"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/pages\/1909\/revisions\/3345"}],"up":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/pages\/1898"}],"wp:attachment":[{"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/media?parent=1909"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}