{"id":2145,"date":"2025-08-29T07:13:53","date_gmt":"2025-08-29T07:13:53","guid":{"rendered":"https:\/\/flj-pcb.com\/?page_id=2145"},"modified":"2025-09-25T09:02:55","modified_gmt":"2025-09-25T09:02:55","slug":"rf-pcb","status":"publish","type":"page","link":"https:\/\/flj-pcb.com\/de_at\/pcb-manufacturer\/rf-pcb\/","title":{"rendered":"Entwurfsregeln f\u00fcr RF PCBs: Vom Material bis zum Layout"},"content":{"rendered":"
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RF PCB ist eine Art von Leiterplatte (PCB), die f\u00fcr die \u00dcbertragung und Verarbeitung von Hochfrequenzsignalen hergestellt wird. Diese Signale sind Hochfrequenzsignale. Sie haben in der Regel eine Frequenz von 300 kHz oder mehr und k\u00f6nnen bis zu 300 GHz betragen.<\/p>

\"RF<\/p>

\u00a0<\/p>

Hochfrequenz (RF) ist eine Bezeichnung f\u00fcr eine Gruppe von elektromagnetischen Wellen. Diese Bezeichnung wird verwendet, wenn die Wellen f\u00fcr die Funkkommunikation geeignet sind. Der Frequenzbereich f\u00fcr RF ist in den verschiedenen B\u00fcchern nicht immer gleich. In einigen B\u00fcchern hei\u00dft es, dass RF zwischen 30 MHz und 3 GHz liegt. In anderen hei\u00dft es, er reiche von 300 MHz bis 40 GHz. Diese Bereiche k\u00f6nnen sich mit dem Bereich \u00fcberschneiden, der als Mikrowelle bezeichnet wird. Andere B\u00fccher verwenden eine andere Aufteilung des Spektrums. Sie sagen, dass Wellen mit einer Wellenl\u00e4nge von 1 Megameter bis 1 Meter zu einer Gruppe geh\u00f6ren. Das ergibt Frequenzen von 30 Hz bis 300 MHz. Die Grenze zwischen HF und Mikrowellen ist nicht ganz klar. Sie kann sich \u00e4ndern, wenn Bauteile und Konstruktionsmethoden besser werden.<\/p>

RF PCB und seine Hauptmerkmale<\/h1>

Wenn wir eine Leiterplatte f\u00fcr den HF-Einsatz entwerfen, m\u00fcssen wir dar\u00fcber nachdenken, wie sich \u00dcbertragungsleitungen verhalten. F\u00fcr einen Draht oder eine Leiterbahn auf einer Leiterplatte gibt es zwei M\u00f6glichkeiten, sie zu modellieren. Die eine ist das Modell mit vereinzelten Elementen. Die andere ist das Modell mit verteilten Parametern. Eine allgemeine Regel lautet wie folgt. Wenn die geometrische L\u00e4nge l geteilt durch die Wellenl\u00e4nge \u03bb gleich oder gr\u00f6\u00dfer als 0,05 ist, dann verwenden wir das Modell mit verteilten Parametern. In dieser Anmerkung bedeutet eine HF-Verbindung eine Schaltung, bei der die \u00dcbertragungsleitung das verteilte Modell ben\u00f6tigt. In der Praxis ist die Leiterbahnl\u00e4nge selten l\u00e4nger als 50 cm. Wir k\u00f6nnen also von analogen Signalen bei 30 MHz ausgehen. Signale \u00fcber 3 GHz werden oft als Mikrowellen bezeichnet. F\u00fcr Produktionsgrenzen, bei denen der Abstand zwischen den Elementen 0,5 mm betragen kann, wird die obere Frequenz manchmal auf 30 GHz festgelegt. Das ist aber nicht immer sinnvoll.<\/p>

Aus diesen Punkten k\u00f6nnen wir sagen, dass eine HF-Leiterplatte eine Leiterplatte f\u00fcr analoge Signale mit einer Frequenz von 30 MHz bis 6 GHz ist. Die Wahl zwischen einem \"lumped\" oder einem \"distributed\" Modell sollte sich nach der obigen Formel und der Arbeitsfrequenz richten.<\/p>

Da die Dielektrizit\u00e4tskonstante des Substrats in der Regel hoch ist, bewegen sich die Wellen auf der Leiterplatte langsamer als in der Luft. Dadurch wird die Wellenl\u00e4nge auf der Leiterplatte k\u00fcrzer. F\u00fcr Mikrostreifen- und andere Leitungen muss das Substrat einen geringen dielektrischen Verlust aufweisen. Die Dielektrizit\u00e4tskonstante sollte sich \u00fcber den ben\u00f6tigten Frequenz- und Temperaturbereich nicht stark \u00e4ndern. Das Substrat sollte eine gute W\u00e4rmeleitf\u00e4higkeit und eine glatte Oberfl\u00e4che haben. Es muss gut auf dem Leiter haften.<\/p>

F\u00fcr das Metall auf der Leiterbahn ben\u00f6tigen wir eine hohe Leitf\u00e4higkeit. Das Metall sollte einen kleinen Temperaturkoeffizienten des Widerstands haben. Es sollte gut auf dem Substrat haften. Es sollte leicht zu l\u00f6ten sein.<\/p>

Grunds\u00e4tze f\u00fcr die Auswahl von RF-Plattenmaterial<\/h1>

Die Rolle des Substrats bei Mikrowellen-Leiterplatten<\/h2>

Eine Mikrowellen-Leiterplatte ist nicht nur ein Tr\u00e4ger f\u00fcr Komponenten. Sie ist auch ein Medium f\u00fcr elektromagnetische Felder im Mikrowellenbereich. F\u00fcr HF-Schaltungen ist daher ein Hochfrequenz- oder Mikrowellensubstrat die beste Wahl.<\/p>

Kontrolle der Leiterbahnimpedanz<\/h2>

Auf einer HF-Leiterplatte m\u00fcssen die gedruckten Leiterbahnen normalen Regeln wie der Strombelastbarkeit folgen. Dar\u00fcber hinaus m\u00fcssen wir die charakteristische Impedanz der Leiterbahnen kontrollieren. Die Leiterbahnen m\u00fcssen in ihrer Impedanz aufeinander abgestimmt sein. Der Leiterplattenprozess muss also die Impedanz der Leiterbahnen kontrollieren. Die charakteristische Impedanz einer Leiterbahn h\u00e4ngt vom Leiterplattenmaterial und seinen physikalischen Parametern ab. Daher m\u00fcssen Leiterplattendesigner die Leistungsf\u00e4higkeit des Materials kennen.<\/p>

Materialanforderungen f\u00fcr RF-Platten<\/h2>

RF-Platinen ben\u00f6tigen in der Regel hohe Frequenzen und hohe Leistungen. Man w\u00e4hlt ein Substrat mit einer genauen Dielektrizit\u00e4tskonstante. Das Substrat sollte stabil sein und einen geringen Verlust aufweisen. Au\u00dferdem muss das Material f\u00fcr die Produktion geeignet sein. Zum Beispiel muss es f\u00fcr das Reflow-L\u00f6ten bei hohen Temperaturen geeignet sein. Unser Unternehmen verwendet h\u00e4ufig fr4, TACONIC und Materialien von ROGERS als RF-Basismaterial.<\/p>

FR-4 Eigenschaften<\/h2>

fr4 (flammhemmendes kupferkaschiertes Epoxid-Glasgewebe) hat eine bei 1 GHz gepr\u00fcfte Dielektrizit\u00e4tskonstante von Er = 4,3 \u00b1 0,2. Die Glas\u00fcbergangstemperatur Tg betr\u00e4gt 135 \u00b0C. F\u00fcr gew\u00f6hnliche Platinen verwenden wir zwei Arten von Platten. Die eine ist Standardplattenmaterial. Es ist kosteng\u00fcnstig und hat einen ausgereiften Prozess. Die andere ist die UV-Platte, oft auch gelbe Platte genannt. Er verf\u00fcgt \u00fcber UV-BLOCKING, um die ultraviolette Strahlung zu blockieren. Wir verwenden ihn f\u00fcr die Au\u00dfenschichten. Seine Leistung ist ein wenig besser als die der Standardplatte.<\/p>

\"fr-4\"
fr-4<\/figcaption><\/figure>

TACONIC-Material<\/h2>

TACONIC<\/a> ist eine sehr bekannte Marke. Sie hat viele Spezifikationen. Sein Preis ist h\u00f6her als fr4.<\/p>

ROGERS-Material<\/h2>

ROGERS-Material hat eine hohe Genauigkeit der Dielektrizit\u00e4tskonstante. Es ist temperaturstabil und hat einen geringen Verlust. Wir verwenden es f\u00fcr Schaltungen mit hoher Leistung. Die Herstellung und der Prozess der Leiterplatte ist \u00e4hnlich wie bei fr4, so dass die Herstellungskosten niedrig sind. Aber die Haftung der Kupferfolie ist gering.<\/p>

Tabelle der Substrate<\/h1>
Art des Materials<\/th>Typisches Material<\/th>Dk (10 GHz)<\/th>Df (10 GHz)<\/th>Merkmale und Verwendung<\/th><\/tr><\/thead>
Fluorpolymer-Substrat<\/td>PTFE (Polytetrafluorethylen)<\/td>2.1-2.3<\/td>0.0005-0.001<\/td>Sehr geringer Verlust. Gut f\u00fcr mmWave. Verwendung f\u00fcr 5G-Basisstationen und Radar.<\/td><\/tr>
Keramisch gef\u00fclltes Substrat<\/td>Rogers RO4000-Serie<\/td>3.38-4.5<\/td>0.0027-0.004<\/td>Mittlere Kosten. Gut f\u00fcr Mikrowellen geeignet. Verwendung f\u00fcr WiFi- und Bluetooth-Module.<\/td><\/tr>
Glasfasersubstrat<\/td>Hochfrequenz fr4 (wie Isola FR408)<\/td>3.9-4.2<\/td>0.008-0.01<\/td>Geringe Kosten. Gut f\u00fcr mittlere und niedrige RF. F\u00fcr Walkie-Talkies und \u00e4hnliche Anwendungen.<\/td><\/tr><\/tbody><\/table><\/div><\/div>

RF-Probleme beim PCB-Design und L\u00f6sungen<\/h1>

Im Allgemeinen ist bei Schaltungen mit Frequenzen unterhalb des Mikrowellenbereichs (dazu geh\u00f6ren auch digitale Schaltungen mit niedriger Frequenz und niedriger Geschwindigkeit) ein sorgf\u00e4ltiges Layout der erste Schl\u00fcssel zum Erfolg. Wenn man die Regeln kennt, kann man einen guten Entwurf machen. F\u00fcr Mikrostreifen- und Hochgeschwindigkeits-Digitalschaltungen auf PCB-Ebene k\u00f6nnen zwei oder drei PCB-Versionen erforderlich sein, um die Qualit\u00e4t der Schaltung sicherzustellen. Bei HF-Schaltungen mit Frequenzen \u00fcber dem Mikrowellenbereich ben\u00f6tigen Sie mehr Versionen, um die Leistung zu verbessern. Beim Entwurf von HF-Schaltungen werden Sie also mit vielen Herausforderungen konfrontiert.<\/p>

Nachstehend finden Sie eine Liste der h\u00e4ufigsten Probleme und L\u00f6sungen.<\/p>

H\u00e4ufige Probleme beim Entwurf von RF-Schaltungen<\/h2>

  1. Interferenzen zwischen digitalen und analogen Modulen<\/b>
    Wenn analoge HF-Teile und digitale Teile allein arbeiten, kann jedes f\u00fcr sich gut funktionieren. Wenn sie sich jedoch auf derselben Platine befinden und gemeinsam mit Strom versorgt werden, kann das gesamte System instabil werden. Digitale Signale schwanken zwischen Masse und Vcc um mehr als 3 V. Die Periode kann kurz sein, im Nanosekundenbereich. Da die Amplitude gro\u00df ist und die Umschaltung schnell erfolgt, enthalten digitale Signale Hochfrequenzkomponenten, die nicht vom Schalttakt abh\u00e4ngen. Im analogen Teil, von einer abgestimmten Funkschleife bis zu einem Empf\u00e4nger, kann die Spannung weniger als 1 \u03bcV betragen. Der Unterschied zwischen dem kleinen HF-Signal und dem digitalen Rauschen kann mehr als 120 dB betragen. Wenn digitale Signale nicht von HF getrennt werden, kann das schwache HF-Signal besch\u00e4digt werden. Das Funkger\u00e4t funktioniert dann m\u00f6glicherweise nicht mehr oder nur noch schlecht.<\/p><\/li>

  2. Rauschst\u00f6rungen der Stromversorgung<\/b>
    HF-Schaltungen sind empfindlich gegen\u00fcber Rauschen. Sie sind empfindlich gegen\u00fcber Spannungsspitzen und anderen hochfrequenten Oberwellen. Ein Mikrocontroller wird bei jedem internen Taktzyklus pl\u00f6tzlich viel Strom verbrauchen. Die meisten modernen Mikrocontroller verwenden CMOS. Wenn ein Mikrocontroller mit einem internen Takt von 1 MHz l\u00e4uft, wird er mit dieser Rate Strom verbrauchen. Wenn wir keine gute Leistungsentkopplung haben, kommt es zu Spannungsst\u00f6rungen auf den Stromleitungen. Wenn Spannungsspitzen an die HF-Stromversorgungspins gelangen, kann der HF-Block ausfallen.<\/p><\/li>

  3. Schlechte Bodengestaltung<\/b>
    Wenn die Masse nicht gut f\u00fcr HF ausgelegt ist, kann es zu seltsamen Ergebnissen kommen. Beim digitalen Design funktionieren die meisten Schaltungen auch dann, wenn die Masse nicht perfekt ist. Aber im HF-Bereich wirken selbst kurze Erdungsleitungen wie Induktivit\u00e4ten. Eine Induktivit\u00e4t von 1 nH entspricht zum Beispiel einer L\u00e4nge von fast 1 mm. Daraus l\u00e4sst sich ableiten, dass eine 10 mm lange Leiterbahn einen Blindwiderstand von etwa 27 Ohm hat. Wenn wir keine gute Erdung haben, werden viele Erdungsleitungen lang sein und die Schaltung wird ihre geplanten Eigenschaften nicht einhalten.<\/p><\/li>

  4. Antennenstrahlung, die andere analoge Schaltungen st\u00f6rt<\/b>
    Im PCB-Layout gibt es weitere analoge Bauteile. Viele Platinen haben ADCs oder DACs. Ein starkes HF-Signal von einem Sender kann den ADC-Eingang erreichen. Jede Leiterbahn kann wie eine Antenne wirken. Wenn der ADC-Eingang nicht gut behandelt wird, kann das HF-Signal in die ESD-Diode eindringen und einen ADC-Offset oder Fehler verursachen.<\/p><\/li><\/ol>

    RF-Schaltungsentwurfsprinzipien und L\u00f6sungen<\/h2>

    1. Definition des RF-Layouts<\/h3>

    Befolgen Sie diese Regeln, wenn Sie ein RF-Layout entwerfen.<\/p>

    1. Halten Sie Hochleistungsverst\u00e4rker (HPAs) und rauscharme Verst\u00e4rker (LNAs) so weit wie m\u00f6glich auseinander. Bringen Sie Teile mit hoher Sendeleistung weit entfernt von Teilen mit niedriger Leistung unter.<\/p><\/li>

    2. In Hochfrequenzbereichen auf der Leiterplatte sollte mindestens eine vollst\u00e4ndige Massefl\u00e4che vorhanden sein und Durchkontaktierungen vermieden werden. Je gr\u00f6\u00dfer die Kupferfl\u00e4che, desto besser.<\/p><\/li>

    3. Schaltung und Leistungsentkopplung sind gleicherma\u00dfen wichtig.<\/p><\/li>

    4. Stellen Sie die HF-Ausg\u00e4nge von den HF-Eing\u00e4ngen entfernt auf.<\/p><\/li>

    5. Stellen Sie empfindliche analoge Signale weit weg von digitalen und HF-Signalen mit hoher Geschwindigkeit.<\/p><\/li><\/ol>

      \"Definition<\/p>

      2. Regeln f\u00fcr die Gestaltung von physischen und elektrischen Trennw\u00e4nden<\/h3>

      Partitionierung bedeutet die Aufteilung der Platine nach Funktionen. Sie k\u00f6nnen eine physische und eine elektrische Partitionierung vornehmen. Bei der physischen Partition geht es um das Layout der Bauteile, die Richtung und die Abschirmungen. Bei der elektrischen Partition geht es um Stromverteilung, HF-Routing, empfindliche Teile, Signale und Massezonen.<\/p>

      \"RF<\/p>

      a. Physikalische Trennungsprinzipien<\/h4>

      Die Anordnung der Bauteile ist der Schl\u00fcssel zu einem guten HF-Design. Eine gute Methode besteht darin, die Bauteile zun\u00e4chst entlang des HF-Pfads zu platzieren. Legen Sie dann ihre Richtung fest. Platzieren Sie die Eing\u00e4nge von den Ausg\u00e4ngen entfernt. Halten Sie Teile mit hoher und niedriger Leistung voneinander getrennt. Dies hilft, die HF-Pfade zu verk\u00fcrzen.<\/p>

      b. Prinzip des Leiterplattenaufbaus<\/h4>

      Bei einem guten Stapelaufbau befindet sich die Haupterdungsebene auf der Ebene unter der Leiterbahnlage. Legen Sie HF-Leiterbahnen auf die Ebene. Machen Sie Durchkontaktierungen auf HF-Pfaden klein. Dies verringert die Pfadinduktivit\u00e4t und reduziert kalte L\u00f6tstellen auf der Haupterde. Au\u00dferdem dringt weniger HF-Energie in andere Lagen ein.<\/p>

      \"\"<\/p>

      c. RF-Bauteile und RF-Leiterbahnprinzipien<\/h4>

      Auf der Platine k\u00f6nnen lineare Schaltungen wie mehrstufige Verst\u00e4rker HF-Zonen trennen. Aber Duplexer, Mischer und ZF-Verst\u00e4rker lassen oft viele HF- und ZF-Signale nahe beieinander erscheinen. Sie sollten darauf achten, diese Kopplung zu verringern. Verlegen Sie HF- und ZF-Leiterbahnen sorgf\u00e4ltig und lassen Sie zwischen ihnen einen Masseabstand. Der richtige HF-Pfad ist entscheidend f\u00fcr die Leistung der Leiterplatte. Deshalb nimmt das Bauteillayout die meiste Zeit beim Design von Telefonleiterplatten in Anspruch.<\/p>

      d. Elektrisches Trennwandprinzip<\/h4>

      Die meiste Leistung in Telefonschaltungen ist ein niedriger Gleichstrom, so dass Sie keine besonders breiten Leiterbahnen ben\u00f6tigen. Aber f\u00fcr die Versorgung von Hochleistungsverst\u00e4rkern m\u00fcssen Sie breite Leiterbahnen f\u00fcr hohe Str\u00f6me verwenden. Dadurch wird der Spannungsabfall gering gehalten. Verwenden Sie viele Durchkontaktierungen, um den Strom von einer Ebene zur anderen zu leiten und so Stromverluste zu vermeiden.<\/p>

      Die Leistungsentkopplung f\u00fcr Leistungsteile ist wichtig. Wenn Sie es vers\u00e4umen, die Leistung an einem Hochleistungsverst\u00e4rker-Pin zu entkoppeln, k\u00f6nnen viele Probleme auftreten. Rauschen mit hoher Leistung kann \u00fcber die gesamte Platine abgestrahlt werden. Die Erdung von Hochleistungsverst\u00e4rkern ist sehr wichtig. Konstrukteure ben\u00f6tigen oft eine Metallabschirmung.<\/p>

      e. RF-Eingangs-\/Ausgangs-Isolationsprinzip<\/h4>

      Es ist sehr wichtig, den HF-Ausgang vom HF-Eingang fernzuhalten. Dies gilt f\u00fcr Verst\u00e4rker, Puffer und Filter. Im schlimmsten Fall, wenn der Ausgang des Verst\u00e4rkers oder Puffers mit der richtigen Phase und Amplitude an den Eingang zur\u00fcckkommt, kann das Teil in Selbstoszillation geraten. Im guten Fall ist die Schaltung bei allen Temperaturen und Spannungen stabil. Im ung\u00fcnstigen Fall werden dem HF-Signal Rauschen und Intermodulationen hinzugef\u00fcgt.<\/p>

      Zusammenfassung<\/h1>

      Kurz gesagt: HF-Schaltungen arbeiten mit verteilten Parameterleitungen. Sie weisen Skin-Effekt und Kopplung auf. Dadurch unterscheiden sie sich von Niederfrequenz- und Gleichstromschaltungen. Beim Entwurf von HF-Leiterplatten m\u00fcssen Sie sich also auf die oben genannten Punkte konzentrieren. Wenn Sie das tun, wird das Design effektiv und genau sein.<\/p>

      1. Halten Sie die Leiterbahnen so kurz wie m\u00f6glich. Kurze Leiterbahnen verringern Verluste und unerw\u00fcnschte Reaktanzen.<\/p><\/li>

      2. Verwenden Sie das richtige Substrat f\u00fcr die ben\u00f6tigte Frequenz. fr4 ist f\u00fcr viele F\u00e4lle in Ordnung. Verwenden Sie Rogers oder PTFE f\u00fcr geringe Verluste bei hohen Frequenzen.<\/p><\/li>

      3. Kontrollieren Sie die Impedanz der Leiterbahnen. Verwenden Sie die richtige Breite, den richtigen Abstand und die richtige Stapelung. Messen oder berechnen Sie mit Werkzeugen.<\/p><\/li>

      4. Trennen Sie digitale und HF-Teile. Geben Sie jedem Teil eine eigene Masse-R\u00fcckleitung. Verwenden Sie eine Entkopplung an den Stromanschl\u00fcssen in der N\u00e4he des Bauteils.<\/p><\/li>

      5. Verwenden Sie Massefl\u00e4chen und kleine Durchkontaktierungen f\u00fcr die HF-R\u00fcckleitung. Dies senkt die Induktivit\u00e4t.<\/p><\/li>

      6. Bringen Sie Filter und Abschirmungen in der N\u00e4he empfindlicher Teile an. Dies verringert die unerw\u00fcnschte Aufnahme.<\/p><\/li>

      7. Testen Sie mit Prototypen. RF erfordert in der Regel mehrere Layout- und Abstimmungsrunden. Kleine \u00c4nderungen k\u00f6nnen bei hohen Frequenzen gro\u00dfe Auswirkungen haben.<\/p><\/li>

      8. F\u00fcr Antennen ist eine freie Fl\u00e4che vorzusehen, und Metall und andere Leiterbahnen sind fernzuhalten. Antennenanpassung und -abstimmung ben\u00f6tigen oft Platz auf der Platine und m\u00fcssen getestet werden.<\/p><\/li>

      9. Wenn Sie Leiterbahnen f\u00fcr hohe Leistungen herstellen, sollten Sie diese breit machen und viele Durchkontaktierungen verwenden, um den Strom zwischen den Schichten zu leiten.<\/p><\/li><\/ol>

        Grundlegende Formeln und Regeln zur \u00dcberpr\u00fcfung<\/h1>

        1. Verwenden Sie l\/\u03bb \u2265 0,05, um festzustellen, ob eine Kurve ein verteiltes Modell ben\u00f6tigt. l ist die geometrische L\u00e4nge. \u03bb ist die Arbeitswellenl\u00e4nge im Medium.<\/p><\/li>

        2. Um die Induktivit\u00e4t schnell zu erfassen, entspricht 1 nH etwa 1 mm Leiterbahnl\u00e4nge. Verwenden Sie dies, um zu pr\u00fcfen, ob lange Erdungen die Induktivit\u00e4t erh\u00f6hen.<\/p><\/li>

        3. F\u00fcr die Impedanzkontrolle m\u00fcssen Sie die Stapelung, Leiterbahnbreite, Dielektrizit\u00e4tskonstante und den Abstand zur Ebene kennen. Verwenden Sie einen Feldl\u00f6ser oder Impedanzrechner, um genaue Werte zu erhalten.<\/p><\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

          \n\t\t\t\t\t\t\t
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          H\u00e4ufig gestellte Fragen<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
          \n\t\t\t\t
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          \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/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\tWas ist eine RF-Leiterplatte?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

          Eine HF-Leiterplatte (Hochfrequenz-Leiterplatte) ist f\u00fcr die \u00dcbertragung von HF- und Mikrowellensignalen (Hunderte von MHz bis zu vielen GHz) ausgelegt. Sie verwendet kontrollierte Materialien, Aufbauten und Layout-Regeln, um Verluste zu minimieren und die Signalintegrit\u00e4t zu erhalten.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

          \n\t\t\t\t\t
          \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/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\tWelche Substratmaterialien werden typischerweise f\u00fcr RF-Leiterplatten verwendet?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

          \u00dcblich sind Laminate auf PTFE-Basis und technische Materialien (Rogers, Taconic usw.) f\u00fcr niedrige Verluste und stabile dielektrische Eigenschaften; bei einigen Designs mit niedrigeren Frequenzen oder aus Kostengr\u00fcnden k\u00f6nnen auch hochwertige FR-4-Varianten verwendet werden.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

          \n\t\t\t\t\t
          \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/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\tWarum nicht immer FR-4 f\u00fcr RF-Designs verwenden?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

          Standard-FR-4 hat einen h\u00f6heren dielektrischen Verlust und ein weniger stabiles Dk bei GHz-Frequenzen, was die D\u00e4mpfung und die Impedanzvariabilit\u00e4t erh\u00f6ht. Daher werden f\u00fcr Pr\u00e4zisions-HF-Arbeiten in der Regel Laminate der PTFE\/Rogers-Klasse bevorzugt.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

          \n\t\t\t\t\t
          \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/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\tSind Durchgangsstichleitungen ein Problem f\u00fcr RF-Signale?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

          Ja - Durchkontaktierungen wirken wie kurze unterminierte \u00dcbertragungsleitungen und verursachen Reflexionen. Zu den \u00fcblichen Abhilfema\u00dfnahmen geh\u00f6ren Back-Drilling, vergrabene\/gestapelte Vias und eine sorgf\u00e4ltige Platzierung der Vias.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

          \n\t\t\t\t\t
          \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/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\tWelche Tests validieren die Leistung von RF-Leiterplatten?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

          \u00dcbliche Tests: VNA-S-Parameter (Einf\u00fcge-\/Return-D\u00e4mpfung), TDR\/Impedanzpr\u00fcfungen und W\u00e4rme-\/Alterungstests zur \u00dcberpr\u00fcfung der Dk-Stabilit\u00e4t und des Dimensionsverhaltens.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

          \n\t\t\t\t\t
          \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/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\tWas sollte ich einem Hersteller mitteilen, um ein genaues RF-Angebot zu erhalten?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

          Liefern Sie Gerbers\/ODB++, Zielimpedanzwerte, exakten Lagenaufbau, dielektrische Auswahl (oder Dk\/Df-Ziele), BGA\/Rasterinformationen, Via-Anforderungen (Backdrill\/Via-in-Pad) und alle speziellen Routing- oder Montagehinweise. Eine fr\u00fchzeitige DFM-Pr\u00fcfung beschleunigt die Produktion und verringert das Risiko.<\/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":"

          RF PCB is a type of printed circuit board (PCB) made for carrying and handling radio frequency signals. These signals […]<\/p>","protected":false},"author":1,"featured_media":0,"parent":1898,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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          RF PCB is a type of printed circuit board (PCB) made for carrying and handling radio frequency signals. These signals are high frequency. They usually have frequency equal to or above 300 kHz and up to 300 GHz.<\\\/p>

          \\\"RF<\\\/p>

          \\u00a0<\\\/p>

          Radio frequency, or RF, is a name for a group of electromagnetic waves. People use this name when the waves can work for radio communication. The range of frequency for RF is not always the same in different books. Some books say RF is from 30 MHz to 3 GHz. Some say it is from 300 MHz to 40 GHz. These ranges can overlap with the range called microwave. Some other books use a different way to split the spectrum. They say waves with wavelength from 1 megameter to 1 meter are in a group. That gives frequencies from 30 Hz to 300 MHz. The line between RF and microwave is not very clear. The line can change as parts and design methods get better.<\\\/p>

          RF PCB and its main features<\\\/h1>

          When we design a PCB for RF use, we must think about how transmission lines behave. For a wire or trace on a PCB, we can model it in two ways. One is the lumped element model. The other is the distributed parameter model. A common rule is this. If the geometric length l divided by the wavelength \\u03bb is equal to or larger than 0.05, then we use the distributed model. In this note, an RF link means a circuit where the transmission line needs the distributed model. In practice, PCB trace length is rarely longer than 50 cm. So we can start from analog signals at 30 MHz. Signals above 3 GHz are often called microwave. For production limits where element spacing can be 0.5 mm, people sometimes set the top frequency to 30 GHz. But that is not always useful.<\\\/p>

          From these points, we can say an RF PCB is a PCB for analog signals with frequency about 30 MHz to 6 GHz. The choice between lumped or distributed model should follow the formula above and the working frequency.<\\\/p>

          Because the substrate dielectric constant is usually high, waves move slower in the board than in air. That makes wavelength shorter on the board. For microstrip and other lines, the substrate must have low dielectric loss. The dielectric constant should not change much over the needed frequency and temperature range. The substrate should have good thermal conductivity and a smooth surface. It must stick well to the conductor.<\\\/p>

          For the metal on the trace we need high conductivity. The metal should have a small temperature coefficient of resistance. It should stick to the substrate well. It should be easy to solder.<\\\/p>

          Principles for choosing RF board material<\\\/h1>

          Role of substrate in microwave PCBs<\\\/h2>

          A microwave frequency PCB is not only a support for components. It is also a medium for microwave electromagnetic fields. So for RF circuits the best choice is high frequency or microwave grade substrate.<\\\/p>

          Trace impedance control<\\\/h2>

          On an RF PCB the printed traces must follow normal rules like current capacity. In addition, we must control the trace characteristic impedance. The traces must be matched in impedance. So the PCB process must control trace impedance. The characteristic impedance of a trace depends on the PCB material and its physical parameters. So PCB designers must know the material performance.<\\\/p>

          Material requirements for RF boards<\\\/h2>

          RF boards usually need high frequency and high performance. People pick substrate with accurate dielectric constant. The substrate should be stable and have low loss. Also the material must work with production. For example, it must handle high temperature reflow soldering. Our company often uses fr4, TACONIC, and materials from ROGERS for RF base material.<\\\/p>

          FR-4 characteristics<\\\/h2>

          fr4 (flame retardant copper clad epoxy glass fabric) has dielectric constant Er tested at 1 GHz as Er = 4.3 \\u00b1 0.2. The glass transition temperature Tg is 135 \\u00b0C. For common boards we use two kinds of plate. One is standard board material. This is low cost and has mature process. The other is UV board, often called yellow board. It has UV-BLOCKING to block ultraviolet. We use it for outer layers. Its performance is a little better than the standard plate.<\\\/p>[caption id=\\\"attachment_2743\\\" align=\\\"alignnone\\\" width=\\\"688\\\"]\\\"fr-4\\\" fr-4[\\\/caption]

          TACONIC material<\\\/h2>

          TACONIC<\\\/a> is a well known brand. It has many specs. Its price is higher than fr4.<\\\/p>

          ROGERS material<\\\/h2>

          ROGERS material has high dielectric constant accuracy. It is stable with temperature and has low loss. We use it for high power circuits. The PCB make and process is similar to fr4 so cost of making is low. But the copper foil adhesion is low.<\\\/p>

          Substrate table<\\\/h1>
          Material type<\\\/th>Typical material<\\\/th>Dk (10 GHz)<\\\/th>Df (10 GHz)<\\\/th>Features and use<\\\/th><\\\/tr><\\\/thead>
          Fluoropolymer substrate<\\\/td>PTFE (polytetrafluoroethylene)<\\\/td>2.1\\u20132.3<\\\/td>0.0005\\u20130.001<\\\/td>Very low loss. Good for mmWave. Use for 5G base stations and radar.<\\\/td><\\\/tr>
          Ceramic filled substrate<\\\/td>Rogers RO4000 series<\\\/td>3.38\\u20134.5<\\\/td>0.0027\\u20130.004<\\\/td>Mid cost. Good for microwave. Use for WiFi and Bluetooth modules.<\\\/td><\\\/tr>
          Glass fiber substrate<\\\/td>High frequency fr4 (like Isola FR408)<\\\/td>3.9\\u20134.2<\\\/td>0.008\\u20130.01<\\\/td>Low cost. Good for mid and low RF. Use for walkie talkies and similar.<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div>

          RF issues in PCB design and solutions<\\\/h1>

          In general, for circuits with frequency below microwave (this includes low frequency and low speed digital), careful layout is the first key to success. If you know the rules, you can make a good design. For microstrip and high speed digital circuits at PCB level, two or three PCB versions may be needed to ensure circuit quality. For RF circuits with frequency above microwave, you will need more versions to improve performance. So you will face many challenges during RF circuit design.<\\\/p>

          Below we list common problems and solutions.<\\\/p>

          Common problems in RF circuit design<\\\/h2>

          1. Interference between digital and analog modules<\\\/b>
            When analog RF parts and digital parts work alone, each can work well. But when they mix on the same board and share power, the whole system may become unstable. Digital signals swing between ground and Vcc by more than 3 V. The period can be short, in the nanosecond range. Because the amplitude is large and the switching is fast, digital signals include high frequency components that do not depend on the switching clock. In the analog part, from a tuned radio loop to a receiver, the voltage can be less than 1 \\u03bcV. The difference between the small RF signal and digital noise can be more than 120 dB. If digital signals are not kept away from RF, the weak RF signal can get damaged. The radio may stop working or work badly.<\\\/p><\\\/li>

          2. Power supply noise interference<\\\/b>
            RF circuits are sensitive to noise. They are sensitive to spikes and other high frequency harmonics. A microcontroller will suddenly draw lots of current at each internal clock cycle. Most modern microcontrollers use CMOS. If a microcontroller runs with 1 MHz internal clock, it will draw current at that rate. If we do not have good power decoupling, we will get voltage noise on the power lines. If voltage spikes get to the RF power pins, the RF block may fail.<\\\/p><\\\/li>

          3. Bad ground design<\\\/b>
            If the ground is not well designed for RF, strange results can happen. In digital design, most circuits still work even if ground is not perfect. But in RF, even short ground wires act like inductors. For example, 1 nH of inductance is close to 1 mm in length. From that we can guess that a 10 mm long PCB trace has reactance about 27 ohms. If we have no good ground, many ground traces will be long and the circuit will not keep its designed characteristics.<\\\/p><\\\/li>

          4. Antenna radiation interfering with other analog circuits<\\\/b>
            In PCB layout, there are other analog parts. Many boards have ADCs or DACs. A strong RF signal from a transmitter can reach the ADC input. Any trace can act like an antenna. If the ADC input does not have good handling, the RF can go into its ESD diode and cause ADC offset or errors.<\\\/p><\\\/li><\\\/ol>

            RF circuit design principles and solutions<\\\/h2>

            1. Definition of RF layout<\\\/h3>

            When you design RF layout, follow these rules.<\\\/p>

            1. Keep high power amplifiers (HPAs) and low noise amplifiers (LNAs) as far apart as you can. Put high power transmit parts far from low power receive parts.<\\\/p><\\\/li>

            2. In high frequency areas on the PCB, have at least one full ground plane below and avoid vias in it. The larger the copper area the better.<\\\/p><\\\/li>

            3. Circuit and power decoupling are equally important.<\\\/p><\\\/li>

            4. Place RF outputs away from RF inputs.<\\\/p><\\\/li>

            5. Put sensitive analog signals far from high speed digital and RF signals.<\\\/p><\\\/li><\\\/ol>

              \\\"Definition<\\\/p>

              2. Physical partition and electrical partition design rules<\\\/h3>

              Partition means splitting the board by function. You can do physical partition and electrical partition. Physical partition deals with part layout, direction, and shields. Electrical partition deals with power distribution, RF routing, sensitive parts, signals, and ground zones.<\\\/p>

              \\\"RF<\\\/p>

              a. Physical partition principles<\\\/h4>

              Parts layout is key for good RF design. A good method is to place parts along the RF path first. Then set their direction. Place inputs away from outputs. Keep high power and low power parts apart. This helps to shorten RF paths.<\\\/p>

              b. PCB stackup design principle<\\\/h4>

              A good stackup puts the main ground plane on the layer below the trace layer. Put RF traces on the plane layer. Make vias on RF paths small. This reduces path inductance and reduces cold solder joints on the main ground. Also less RF energy will leak into other layers.<\\\/p>

              \\\"\\\"<\\\/p>

              c. RF parts and RF trace principles<\\\/h4>

              In the board space, linear circuits like multistage amplifiers can separate RF zones. But duplexers, mixers, and IF amplifiers often make many RF and IF signals appear near each other. You should take care to lower this coupling. Route RF and IF traces carefully and leave ground space between them. The right RF path is vital for PCB performance. That is why part layout takes most of the time in phone PCB design.<\\\/p>

              d. Electrical partition principle<\\\/h4>

              Most power in phone circuits is low DC so you do not need special wide traces. But for power to high power amplifiers you must make wide traces for high current. This keeps voltage drop small. Use many vias to move current from one plane to another to avoid current loss.<\\\/p>

              Power decoupling for power parts is important. If you fail to decouple the power at a high power amplifier pin, many problems can happen. High power noise can radiate across the board. Ground for high power amplifiers is very important. Designers often need a metal shield can.<\\\/p>

              e. RF input\\\/output isolation principle<\\\/h4>

              It is very important to keep RF output away from RF input. This applies to amplifiers, buffers, and filters. In worst case, if amplifier or buffer output comes back to its input with the right phase and amplitude, the part can go into self-oscillation. In good case, the circuit will be stable at all temperatures and voltages. In bad case, it will add noise and intermodulation to the RF signal.<\\\/p>

              Summary<\\\/h1>

              In short, RF circuits work with distributed parameter lines. They show skin effect and coupling. This makes them different from low frequency and DC circuits. So in RF PCB design you must focus on the points above. If you do, the design will be effective and accurate.<\\\/p>

              1. Keep traces short when possible. Short traces reduce loss and unwanted reactance.<\\\/p><\\\/li>

              2. Use the right substrate for the needed frequency. fr4 is okay for many cases. Use Rogers or PTFE for low loss in high frequency.<\\\/p><\\\/li>

              3. Control impedance of traces. Use the right width and spacing and stackup. Measure or calculate with tools.<\\\/p><\\\/li>

              4. Keep digital and RF parts separate. Give each section its own ground return. Use decoupling at power pins close to the part.<\\\/p><\\\/li>

              5. Use ground planes and small vias for RF return. This lowers inductance.<\\\/p><\\\/li>

              6. Place filters and shielding near sensitive parts. This lowers unwanted pick up.<\\\/p><\\\/li>

              7. Test with prototypes. RF usually needs multiple rounds of layout and tune. Small changes can make big effects at high frequency.<\\\/p><\\\/li>

              8. For antennas, give a clear area and keep metal and other traces away. Antenna matching and tuning often need board space and test.<\\\/p><\\\/li>

              9. When you make high power traces, make them wide and use many vias to carry current between layers.<\\\/p><\\\/li><\\\/ol>

                Basic formulas and rules to check<\\\/h1>

                1. Use l\\\/\\u03bb \\u2265 0.05 to see if a trace needs a distributed model. l is geometric length. \\u03bb is working wavelength in the medium.<\\\/p><\\\/li>

                2. For quick inductance sense, 1 nH is about 1 mm of trace. Use this to check if long grounds add inductance.<\\\/p><\\\/li>

                3. For impedance control, know the stackup, trace width, dielectric constant, and distance to plane. Use a field solver or impedance calculator to get accurate values.<\\\/p><\\\/li><\\\/ol>\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"351cd37\"}]},\"elements\":[],\"widgetType\":\"text-editor\"}],\"isInner\":false},{\"id\":\"vdmvn40\",\"elType\":\"section\",\"settings\":{\"gap\":\"no\",\"content_position\":\"top\",\"background_background\":\"classic\",\"background_color\":\"#FFFFFF00\",\"background_position\":\"bottom center\",\"background_attachment\":\"scroll\",\"background_repeat\":\"no-repeat\",\"background_size\":\"cover\",\"background_size_mobile\":\"cover\",\"background_overlay_background\":\"classic\",\"background_overlay_color_b\":\"rgba(255,255,255,0)\",\"background_overlay_opacity\":{\"unit\":\"px\",\"size\":\"\",\"sizes\":[]},\"padding\":{\"unit\":\"px\",\"top\":\"0\",\"right\":\"0\",\"bottom\":\"0\",\"left\":\"0\",\"isLinked\":false},\"padding_tablet\":{\"unit\":\"px\",\"top\":\"80\",\"right\":\"40\",\"bottom\":\"80\",\"left\":\"40\",\"isLinked\":false},\"padding_mobile\":{\"unit\":\"px\",\"top\":\"50\",\"right\":\"25\",\"bottom\":\"50\",\"left\":\"25\",\"isLinked\":false},\"content_width\":{\"unit\":\"px\",\"size\":800,\"sizes\":[]},\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"d7a4f88\"}],\"margin\":{\"unit\":\"px\",\"top\":\"0\",\"right\":0,\"bottom\":\"0\",\"left\":0,\"isLinked\":true}},\"elements\":[{\"id\":\"7882748\",\"elType\":\"column\",\"settings\":{\"_column_size\":100,\"_inline_size\":null,\"padding\":{\"unit\":\"px\",\"top\":\"0\",\"right\":\"0\",\"bottom\":\"0\",\"left\":\"0\",\"isLinked\":true},\"space_between_widgets\":40,\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"051b026\"}]},\"elements\":[{\"id\":\"9fc6712\",\"elType\":\"widget\",\"settings\":{\"title\":\"Frequently Asked Questions\",\"align\":\"center\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"a4e53df\"}]},\"elements\":[],\"widgetType\":\"heading\"},{\"id\":\"631b990\",\"elType\":\"widget\",\"settings\":{\"tabs\":[{\"tab_title\":\"What is an RF PCB?\",\"tab_content\":\"

                  An RF (radio-frequency) PCB is designed to carry RF and microwave signals (hundreds of MHz up to many GHz). It uses controlled materials, stackups and layout rules to minimize loss and preserve signal integrity.<\\\/p>\",\"_id\":\"1f7b19c\"},{\"_id\":\"ef631eb\",\"tab_title\":\"Which substrate materials are typically used for RF PCBs?\",\"tab_content\":\"

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                  \\n\\t\\t\\t\\t\\t
                  \\n\\t\\t[elementor-element k=\\\"0e46bd9387093ca73b9000e38f18cce4\\\" data=\\\"{"id":"1e7d27b","elType":"widget","settings":{"editor":"<p data-start=\"10\" data-end=\"220\">RF PCB is a type of printed circuit board (PCB) made for carrying and handling radio frequency signals. These signals are high frequency. They usually have frequency equal to or above 300 kHz and up to 300 GHz.<\/p><p data-start=\"10\" data-end=\"220\"><img class=\"alignnone size-full wp-image-2746\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-PCB.webp\" alt=\"RF PCB\" width=\"633\" height=\"500\" \/><\/p><p data-start=\"10\" data-end=\"220\">\u00a0<\/p><p data-start=\"222\" data-end=\"870\">Radio frequency, or RF, is a name for a group of electromagnetic waves. People use this name when the waves can work for radio communication. The range of frequency for RF is not always the same in different books. Some books say RF is from 30 MHz to 3 GHz. Some say it is from 300 MHz to 40 GHz. These ranges can overlap with the range called microwave. Some other books use a different way to split the spectrum. They say waves with wavelength from 1 megameter to 1 meter are in a group. That gives frequencies from 30 Hz to 300 MHz. The line between RF and microwave is not very clear. The line can change as parts and design methods get better.<\/p><h1 data-start=\"872\" data-end=\"902\">RF PCB and its main features<\/h1><p data-start=\"904\" data-end=\"1662\">When we design a PCB for RF use, we must think about how transmission lines behave. For a wire or trace on a PCB, we can model it in two ways. One is the lumped element model. The other is the distributed parameter model. A common rule is this. If the geometric length l divided by the wavelength \u03bb is equal to or larger than 0.05, then we use the distributed model. In this note, an RF link means a circuit where the transmission line needs the distributed model. In practice, PCB trace length is rarely longer than 50 cm. So we can start from analog signals at 30 MHz. Signals above 3 GHz are often called microwave. For production limits where element spacing can be 0.5 mm, people sometimes set the top frequency to 30 GHz. But that is not always useful.<\/p><p data-start=\"1664\" data-end=\"1875\">From these points, we can say an RF PCB is a PCB for analog signals with frequency about 30 MHz to 6 GHz. The choice between lumped or distributed model should follow the formula above and the working frequency.<\/p><p data-start=\"1877\" data-end=\"2307\">Because the substrate dielectric constant is usually high, waves move slower in the board than in air. That makes wavelength shorter on the board. For microstrip and other lines, the substrate must have low dielectric loss. The dielectric constant should not change much over the needed frequency and temperature range. The substrate should have good thermal conductivity and a smooth surface. It must stick well to the conductor.<\/p><p data-start=\"2309\" data-end=\"2499\">For the metal on the trace we need high conductivity. The metal should have a small temperature coefficient of resistance. It should stick to the substrate well. It should be easy to solder.<\/p><h1 data-start=\"0\" data-end=\"43\">Principles for choosing RF board material<\/h1><h2 data-start=\"45\" data-end=\"85\">Role of substrate in microwave PCBs<\/h2><p data-start=\"86\" data-end=\"290\">A microwave frequency PCB is not only a support for components. It is also a medium for microwave electromagnetic fields. So for RF circuits the best choice is high frequency or microwave grade substrate.<\/p><h2 data-start=\"292\" data-end=\"320\">Trace impedance control<\/h2><p data-start=\"321\" data-end=\"705\">On an RF PCB the printed traces must follow normal rules like current capacity. In addition, we must control the trace characteristic impedance. The traces must be matched in impedance. So the PCB process must control trace impedance. The characteristic impedance of a trace depends on the PCB material and its physical parameters. So PCB designers must know the material performance.<\/p><h2 data-start=\"707\" data-end=\"747\">Material requirements for RF boards<\/h2><p data-start=\"748\" data-end=\"1107\">RF boards usually need high frequency and high performance. People pick substrate with accurate dielectric constant. The substrate should be stable and have low loss. Also the material must work with production. For example, it must handle high temperature reflow soldering. Our company often uses fr4, TACONIC, and materials from ROGERS for RF base material.<\/p><h2 data-start=\"1109\" data-end=\"1134\">FR-4 characteristics<\/h2><p data-start=\"1135\" data-end=\"1593\">fr4 (flame retardant copper clad epoxy glass fabric) has dielectric constant Er tested at 1 GHz as Er = 4.3 \u00b1 0.2. The glass transition temperature Tg is 135 \u00b0C. For common boards we use two kinds of plate. One is standard board material. This is low cost and has mature process. The other is UV board, often called yellow board. It has UV-BLOCKING to block ultraviolet. We use it for outer layers. Its performance is a little better than the standard plate.<\/p>[caption id=\"attachment_2743\" align=\"alignnone\" width=\"688\"]<img class=\"wp-image-2743 size-full\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/fr-4.webp\" alt=\"fr-4\" width=\"688\" height=\"459\" \/> fr-4[\/caption]<h2 data-start=\"1595\" data-end=\"1616\">TACONIC material<\/h2><p data-start=\"1617\" data-end=\"1696\"><a href=\"https:\/\/www.taconic.com\/\">TACONIC<\/a> is a well known brand. It has many specs. Its price is higher than fr4.<\/p><h2 data-start=\"1698\" data-end=\"1718\">ROGERS material<\/h2><p data-start=\"1719\" data-end=\"1962\">ROGERS material has high dielectric constant accuracy. It is stable with temperature and has low loss. We use it for high power circuits. The PCB make and process is similar to fr4 so cost of making is low. But the copper foil adhesion is low.<\/p><h1 data-start=\"4343\" data-end=\"4360\">Substrate table<\/h1><div class=\"_tableContainer_1rjym_1\"><div class=\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"4362\" data-end=\"4924\"><thead data-start=\"4362\" data-end=\"4443\"><tr data-start=\"4362\" data-end=\"4443\"><th data-start=\"4362\" data-end=\"4376\" data-col-size=\"sm\">Material type<\/th><th data-start=\"4376\" data-end=\"4395\" data-col-size=\"sm\">Typical material<\/th><th data-start=\"4395\" data-end=\"4409\" data-col-size=\"sm\">Dk (10 GHz)<\/th><th data-start=\"4409\" data-end=\"4423\" data-col-size=\"sm\">Df (10 GHz)<\/th><th data-start=\"4423\" data-end=\"4443\" data-col-size=\"md\">Features and use<\/th><\/tr><\/thead><tbody data-start=\"4469\" data-end=\"4924\"><tr data-start=\"4469\" data-end=\"4622\"><td data-start=\"4469\" data-end=\"4493\" data-col-size=\"sm\">Fluoropolymer substrate<\/td><td data-start=\"4493\" data-end=\"4526\" data-col-size=\"sm\">PTFE (polytetrafluoroethylene)<\/td><td data-start=\"4526\" data-end=\"4536\" data-col-size=\"sm\">2.1\u20132.3<\/td><td data-start=\"4536\" data-end=\"4551\" data-col-size=\"sm\">0.0005\u20130.001<\/td><td data-start=\"4551\" data-end=\"4622\" data-col-size=\"md\">Very low loss. Good for mmWave. Use for 5G base stations and radar.<\/td><\/tr><tr data-start=\"4623\" data-end=\"4766\"><td data-start=\"4623\" data-end=\"4648\" data-col-size=\"sm\">Ceramic filled substrate<\/td><td data-start=\"4648\" data-end=\"4671\" data-col-size=\"sm\">Rogers RO4000 series<\/td><td data-start=\"4671\" data-end=\"4682\" data-col-size=\"sm\">3.38\u20134.5<\/td><td data-start=\"4682\" data-end=\"4697\" data-col-size=\"sm\">0.0027\u20130.004<\/td><td data-start=\"4697\" data-end=\"4766\" data-col-size=\"md\">Mid cost. Good for microwave. Use for WiFi and Bluetooth modules.<\/td><\/tr><tr data-start=\"4767\" data-end=\"4924\"><td data-start=\"4767\" data-end=\"4789\" data-col-size=\"sm\">Glass fiber substrate<\/td><td data-start=\"4789\" data-end=\"4829\" data-col-size=\"sm\">High frequency fr4 (like Isola FR408)<\/td><td data-start=\"4829\" data-end=\"4839\" data-col-size=\"sm\">3.9\u20134.2<\/td><td data-start=\"4839\" data-end=\"4852\" data-col-size=\"sm\">0.008\u20130.01<\/td><td data-start=\"4852\" data-end=\"4924\" data-col-size=\"md\">Low cost. Good for mid and low RF. Use for walkie talkies and similar.<\/td><\/tr><\/tbody><\/table><\/div><\/div><h1 data-start=\"4926\" data-end=\"4965\">RF issues in PCB design and solutions<\/h1><p data-start=\"4967\" data-end=\"5457\">In general, for circuits with frequency below microwave (this includes low frequency and low speed digital), careful layout is the first key to success. If you know the rules, you can make a good design. For microstrip and high speed digital circuits at PCB level, two or three PCB versions may be needed to ensure circuit quality. For RF circuits with frequency above microwave, you will need more versions to improve performance. So you will face many challenges during RF circuit design.<\/p><p data-start=\"5459\" data-end=\"5503\">Below we list common problems and solutions.<\/p><h2 data-start=\"5505\" data-end=\"5544\">Common problems in RF circuit design<\/h2><ol data-start=\"5546\" data-end=\"7663\"><li data-start=\"5546\" data-end=\"6328\"><p data-start=\"5549\" data-end=\"6328\"><b>Interference between digital and analog modules<\/b><br data-start=\"5596\" data-end=\"5599\" \/>When analog RF parts and digital parts work alone, each can work well. But when they mix on the same board and share power, the whole system may become unstable. Digital signals swing between ground and Vcc by more than 3 V. The period can be short, in the nanosecond range. Because the amplitude is large and the switching is fast, digital signals include high frequency components that do not depend on the switching clock. In the analog part, from a tuned radio loop to a receiver, the voltage can be less than 1 \u03bcV. The difference between the small RF signal and digital noise can be more than 120 dB. If digital signals are not kept away from RF, the weak RF signal can get damaged. The radio may stop working or work badly.<\/p><\/li><li data-start=\"6330\" data-end=\"6831\"><p data-start=\"6333\" data-end=\"6831\"><b>Power supply noise interference<\/b><br data-start=\"6364\" data-end=\"6367\" \/>RF circuits are sensitive to noise. They are sensitive to spikes and other high frequency harmonics. A microcontroller will suddenly draw lots of current at each internal clock cycle. Most modern microcontrollers use CMOS. If a microcontroller runs with 1 MHz internal clock, it will draw current at that rate. If we do not have good power decoupling, we will get voltage noise on the power lines. If voltage spikes get to the RF power pins, the RF block may fail.<\/p><\/li><li data-start=\"6833\" data-end=\"7315\"><p data-start=\"6836\" data-end=\"7315\"><b>Bad ground design<\/b><br data-start=\"6853\" data-end=\"6856\" \/>If the ground is not well designed for RF, strange results can happen. In digital design, most circuits still work even if ground is not perfect. But in RF, even short ground wires act like inductors. For example, 1 nH of inductance is close to 1 mm in length. From that we can guess that a 10 mm long PCB trace has reactance about 27 ohms. If we have no good ground, many ground traces will be long and the circuit will not keep its designed characteristics.<\/p><\/li><li data-start=\"7317\" data-end=\"7663\"><p data-start=\"7320\" data-end=\"7663\"><b>Antenna radiation interfering with other analog circuits<\/b><br data-start=\"7376\" data-end=\"7379\" \/>In PCB layout, there are other analog parts. Many boards have ADCs or DACs. A strong RF signal from a transmitter can reach the ADC input. Any trace can act like an antenna. If the ADC input does not have good handling, the RF can go into its ESD diode and cause ADC offset or errors.<\/p><\/li><\/ol><h2 data-start=\"7665\" data-end=\"7710\">RF circuit design principles and solutions<\/h2><h3 data-start=\"7712\" data-end=\"7744\">1. Definition of RF layout<\/h3><p data-start=\"7745\" data-end=\"7791\">When you design RF layout, follow these rules.<\/p><ol data-start=\"7793\" data-end=\"8272\"><li data-start=\"7793\" data-end=\"7952\"><p data-start=\"7796\" data-end=\"7952\">Keep high power amplifiers (HPAs) and low noise amplifiers (LNAs) as far apart as you can. Put high power transmit parts far from low power receive parts.<\/p><\/li><li data-start=\"7953\" data-end=\"8096\"><p data-start=\"7956\" data-end=\"8096\">In high frequency areas on the PCB, have at least one full ground plane below and avoid vias in it. The larger the copper area the better.<\/p><\/li><li data-start=\"8097\" data-end=\"8153\"><p data-start=\"8100\" data-end=\"8153\">Circuit and power decoupling are equally important.<\/p><\/li><li data-start=\"8154\" data-end=\"8196\"><p data-start=\"8157\" data-end=\"8196\">Place RF outputs away from RF inputs.<\/p><\/li><li data-start=\"8197\" data-end=\"8272\"><p data-start=\"8200\" data-end=\"8272\">Put sensitive analog signals far from high speed digital and RF signals.<\/p><\/li><\/ol><p><img class=\"alignnone size-full wp-image-2742\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Definition-of-RF-layout.webp\" alt=\"Definition of RF layout\" width=\"600\" height=\"399\" \/><\/p><h3 data-start=\"8274\" data-end=\"8339\">2. Physical partition and electrical partition design rules<\/h3><p data-start=\"8340\" data-end=\"8619\">Partition means splitting the board by function. You can do physical partition and electrical partition. Physical partition deals with part layout, direction, and shields. Electrical partition deals with power distribution, RF routing, sensitive parts, signals, and ground zones.<\/p><p data-start=\"8340\" data-end=\"8619\"><img class=\"alignnone size-full wp-image-2745\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-partition.webp\" alt=\"RF partition\" width=\"640\" height=\"511\" \/><\/p><h4 data-start=\"8621\" data-end=\"8660\">a. Physical partition principles<\/h4><p data-start=\"8661\" data-end=\"8890\">Parts layout is key for good RF design. A good method is to place parts along the RF path first. Then set their direction. Place inputs away from outputs. Keep high power and low power parts apart. This helps to shorten RF paths.<\/p><h4 data-start=\"8892\" data-end=\"8930\">b. PCB stackup design principle<\/h4><p data-start=\"8931\" data-end=\"9200\">A good stackup puts the main ground plane on the layer below the trace layer. Put RF traces on the plane layer. Make vias on RF paths small. This reduces path inductance and reduces cold solder joints on the main ground. Also less RF energy will leak into other layers.<\/p><p data-start=\"8931\" data-end=\"9200\"><img class=\"alignnone size-full wp-image-2744\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/RF-circuit-design.webp\" alt=\"\" width=\"640\" height=\"462\" \/><\/p><h4 data-start=\"9202\" data-end=\"9244\">c. RF parts and RF trace principles<\/h4><p data-start=\"9245\" data-end=\"9660\">In the board space, linear circuits like multistage amplifiers can separate RF zones. But duplexers, mixers, and IF amplifiers often make many RF and IF signals appear near each other. You should take care to lower this coupling. Route RF and IF traces carefully and leave ground space between them. The right RF path is vital for PCB performance. That is why part layout takes most of the time in phone PCB design.<\/p><h4 data-start=\"9662\" data-end=\"9702\">d. Electrical partition principle<\/h4><p data-start=\"9703\" data-end=\"9974\">Most power in phone circuits is low DC so you do not need special wide traces. But for power to high power amplifiers you must make wide traces for high current. This keeps voltage drop small. Use many vias to move current from one plane to another to avoid current loss.<\/p><p data-start=\"9976\" data-end=\"10253\">Power decoupling for power parts is important. If you fail to decouple the power at a high power amplifier pin, many problems can happen. High power noise can radiate across the board. Ground for high power amplifiers is very important. Designers often need a metal shield can.<\/p><h4 data-start=\"10255\" data-end=\"10300\">e. RF input\/output isolation principle<\/h4><p data-start=\"10301\" data-end=\"10697\">It is very important to keep RF output away from RF input. This applies to amplifiers, buffers, and filters. In worst case, if amplifier or buffer output comes back to its input with the right phase and amplitude, the part can go into self-oscillation. In good case, the circuit will be stable at all temperatures and voltages. In bad case, it will add noise and intermodulation to the RF signal.<\/p><h1 data-start=\"10699\" data-end=\"10708\">Summary<\/h1><p data-start=\"10710\" data-end=\"10978\">In short, RF circuits work with distributed parameter lines. They show skin effect and coupling. This makes them different from low frequency and DC circuits. So in RF PCB design you must focus on the points above. If you do, the design will be effective and accurate.<\/p><ol data-start=\"11035\" data-end=\"12161\"><li data-start=\"11164\" data-end=\"11250\"><p data-start=\"11167\" data-end=\"11250\">Keep traces short when possible. Short traces reduce loss and unwanted reactance.<\/p><\/li><li data-start=\"11251\" data-end=\"11384\"><p data-start=\"11254\" data-end=\"11384\">Use the right substrate for the needed frequency. fr4 is okay for many cases. Use Rogers or PTFE for low loss in high frequency.<\/p><\/li><li data-start=\"11385\" data-end=\"11496\"><p data-start=\"11388\" data-end=\"11496\">Control impedance of traces. Use the right width and spacing and stackup. Measure or calculate with tools.<\/p><\/li><li data-start=\"11497\" data-end=\"11626\"><p data-start=\"11500\" data-end=\"11626\">Keep digital and RF parts separate. Give each section its own ground return. Use decoupling at power pins close to the part.<\/p><\/li><li data-start=\"11627\" data-end=\"11703\"><p data-start=\"11630\" data-end=\"11703\">Use ground planes and small vias for RF return. This lowers inductance.<\/p><\/li><li data-start=\"11704\" data-end=\"11788\"><p data-start=\"11707\" data-end=\"11788\">Place filters and shielding near sensitive parts. This lowers unwanted pick up.<\/p><\/li><li data-start=\"11789\" data-end=\"11922\"><p data-start=\"11792\" data-end=\"11922\">Test with prototypes. RF usually needs multiple rounds of layout and tune. Small changes can make big effects at high frequency.<\/p><\/li><li data-start=\"11923\" data-end=\"12058\"><p data-start=\"11926\" data-end=\"12058\">For antennas, give a clear area and keep metal and other traces away. Antenna matching and tuning often need board space and test.<\/p><\/li><li data-start=\"12059\" data-end=\"12161\"><p data-start=\"12063\" data-end=\"12161\">When you make high power traces, make them wide and use many vias to carry current between layers.<\/p><\/li><\/ol><h1 data-start=\"12163\" data-end=\"12198\">Basic formulas and rules to check<\/h1><ol data-start=\"12200\" data-end=\"12606\"><li data-start=\"12200\" data-end=\"12326\"><p data-start=\"12203\" data-end=\"12326\">Use l\/\u03bb \u2265 0.05 to see if a trace needs a distributed model. l is geometric length. \u03bb is working wavelength in the medium.<\/p><\/li><li data-start=\"12327\" data-end=\"12438\"><p data-start=\"12330\" data-end=\"12438\">For quick inductance sense, 1 nH is about 1 mm of trace. Use this to check if long grounds add inductance.<\/p><\/li><li data-start=\"12439\" data-end=\"12606\"><p data-start=\"12442\" data-end=\"12606\">For impedance control, know the stackup, trace width, dielectric constant, and distance to plane. Use a field solver or impedance calculator to get accurate values.<\/p><\/li><\/ol>","display_condition_list":[{"display_condition_login_status":"subscriber","_id":"351cd37"}]},"elements":[],"widgetType":"text-editor"}\\\"]\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t
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                  Frequently Asked Questions<\\\/h2>\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t
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                  \\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/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\\tWhat is an RF PCB?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t

                  An RF (radio-frequency) PCB is designed to carry RF and microwave signals (hundreds of MHz up to many GHz). It uses controlled materials, stackups and layout rules to minimize loss and preserve signal integrity.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t

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                  \\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/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\\tWhich substrate materials are typically used for RF PCBs?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t

                  Common choices are PTFE-based laminates and engineered materials (Rogers, Taconic, etc.) for low loss and stable dielectric properties; in some lower-frequency or cost-sensitive designs, high-grade FR-4 variants may be used.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t

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                  \\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/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\\tWhy not always use FR-4 for RF designs?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t

                  Standard FR-4 has higher dielectric loss and less stable Dk at GHz frequencies, which increases attenuation and impedance variability\\u2014so for precision RF work PTFE\\\/Rogers-class laminates are usually preferred.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t

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                  \\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/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\\tAre via stubs a problem for RF signals?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t

                  Yes\\u2014via stubs act like short unterminated transmission lines and cause reflections. Common mitigations include back-drilling, buried\\\/stacked vias, and careful via placement.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t

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                  Common tests: VNA S-parameter (insertion\\\/return loss), TDR\\\/impedance checks, and thermal\\\/aging tests to verify Dk stability and dimensional behavior.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t

                  \\n\\t\\t\\t\\t\\t
                  \\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/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\\tWhat should I provide to a manufacturer for an accurate RF quote?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t

                  Supply Gerbers\\\/ODB++, target impedance values, exact layer stackup, dielectric choices (or Dk\\\/Df targets), BGA\\\/pitch info, via requirements (backdrill\\\/via-in-pad), and any special routing or assembly notes. Early DFM review speeds up production and reduces risk.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/section>\\n\\t\\t\",\"scripts\":[],\"styles\":[]}}"],"_uag_css_file_name":["uag-css-2145.css"],"_uag_js_file_name":["uag-js-2145.js"]},"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"Philifast","author_link":"https:\/\/flj-pcb.com\/de_at\/author\/2475017442jygmail-com\/"},"uagb_comment_info":0,"uagb_excerpt":"RF PCB is a type of printed circuit board (PCB) made for carrying and handling radio frequency signals. These signals […]","_links":{"self":[{"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/pages\/2145","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=2145"}],"version-history":[{"count":29,"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/pages\/2145\/revisions"}],"predecessor-version":[{"id":3362,"href":"https:\/\/flj-pcb.com\/de_at\/wp-json\/wp\/v2\/pages\/2145\/revisions\/3362"}],"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=2145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}