{"id":5932,"date":"2026-07-17T08:47:00","date_gmt":"2026-07-17T00:47:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=5932"},"modified":"2026-06-25T15:27:42","modified_gmt":"2026-06-25T07:27:42","slug":"dk-and-df-values-in-pcb-materials","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/","title":{"rendered":"Dk- en Df-waarden in PCB-materialen"},"content":{"rendered":"<p>Bij de beoordeling van PCB-materialen komen in vrijwel elk gegevensblad van een laminaat twee parameters voor: de di\u00eblektrische constante (Dk) en de dissipatiefactor (Df). Deze waarden zijn van invloed op de signaalvoering, de impedantieregeling, het invoegverlies en de algehele prestaties van het circuit.<\/p><p>Bij elektronica met lage snelheden hebben kleine variaties in Dk en Df wellicht weinig invloed. In moderne communicatiesystemen, digitale producten met hoge snelheden, RF-schakelingen en apparatuur voor datacenters worden de materiaaleigenschappen echter steeds belangrijker.<\/p><p>Als ingenieurs begrijpen wat Dk en Df betekenen, kunnen ze geschikte materialen kiezen en problemen met de signaalintegriteit in een later stadium van het ontwerpproces voorkomen.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"350\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values.jpg\" alt=\"Dk- en Df-waarden\" class=\"wp-image-5933\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values-300x175.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Inhoudsopgave<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#What_Is_Dielectric_Constant_Dk\" >Wat is de di\u00eblektrische constante (Dk)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#What_Is_Dissipation_Factor_Df\" >Wat is de dissipatiefactor (Df)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Why_Dk_Matters_in_PCB_Design\" >Waarom Dk belangrijk is bij het ontwerpen van printplaten<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Impedance_Control\" >Impedantieregeling<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Signal_Propagation_Delay\" >Vertraging bij signaaloverdracht<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#RF_Circuit_Performance\" >Prestaties van RF-schakelingen<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Why_Df_Matters_in_High-Speed_Design\" >Waarom Df belangrijk is bij het ontwerpen van systemen met hoge snelheden<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Signal_Loss\" >Signaalverlies<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Eye_Diagram_Performance\" >Prestaties van het oogdiagram<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Longer_Routing_Distances\" >Langere routeafstanden<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Dk_and_Df_are_frequency-dependent\" >Dk en Df zijn frequentieafhankelijk<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Typical_Material_Categories\" >Typische materiaalcategorie\u00ebn<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Standard_FR4\" >Standaard FR4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#High_TG_FR4\" >FR4 met hoge TG<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Low-Loss_Materials\" >Materialen met een lage verliesfactor<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#RF_and_Microwave_Materials\" >RF- en microgolfmaterialen<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Material_Selection_Considerations\" >Overwegingen bij materiaalselectie<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Common_Engineering_Misconceptions\" >Veelvoorkomende misvattingen op het gebied van techniek<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Lower_Dk_Is_Always_Better\" >Een lagere Dk-waarde is altijd beter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#Df_Only_Matters_in_RF_Design\" >Df is alleen van belang bij RF-ontwerp<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#All_FR4_Materials_Have_the_Same_Dk_and_Df\" >Alle FR4-materialen hebben dezelfde Dk- en Df-waarden<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/dk-and-df-values-in-pcb-materials\/#FAQ\" >FAQ<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_Dielectric_Constant_Dk\"><\/span>Wat is de di\u00eblektrische constante (Dk)?<span class=\"ez-toc-section-end\"><\/span><\/h2><p>De di\u00eblektrische constante, vaak afgekort als Dk, geeft aan hoe een isolerend materiaal elektrische energie opslaat.<\/p><p>Bij het ontwerpen van printplaten bepaalt Dk hoe snel signalen zich door het di\u00eblektrische materiaal voortbewegen.<\/p><p>Een lagere Dk leidt over het algemeen tot:<\/p><ul class=\"wp-block-list\"><li>Snellere signaalvoortplanting<\/li>\n\n<li>Verminderde signaalvertraging<\/li>\n\n<li>Lagere parasitaire capaciteit<\/li><\/ul><p>Een hogere Dk leidt doorgaans tot:<\/p><ul class=\"wp-block-list\"><li>Lagere signaalsnelheid<\/li>\n\n<li>Verhoogde capaciteit<\/li>\n\n<li>Compactere RF-structuren<\/li><\/ul><p>Elk laminaatmateriaal heeft zijn eigen bereik aan di\u00eblektrische constanten.<\/p><p>Enkele typische waarden zijn:<\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Materiaal<\/th><th>Typisch Dk<\/th><\/tr><tr><td>FR4<\/td><td>4,2 \u2013 4,8<\/td><\/tr><tr><td>FR4 met hoge TG<\/td><td>4.1 \u2013 4.7<\/td><\/tr><tr><td>Rogers 4350B<\/td><td>3.48<\/td><\/tr><tr><td>PTFE-materialen<\/td><td>2.1 \u2013 2.6<\/td><\/tr><tr><td>Megtron 6<\/td><td>3,3 \u2013 3,5<\/td><\/tr><\/tbody><\/table><\/figure><p>Zoals besproken in <strong><a href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/fr4-pcb-material\/\">Uitleg over FR4-printplaatmateriaal<\/a><\/strong>, standaard FR4 blijft geschikt voor de meeste algemene elektronische toepassingen, ondanks dat het een hogere Dk heeft dan veel hoogfrequente materialen.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_Dissipation_Factor_Df\"><\/span>Wat is de dissipatiefactor (Df)?<span class=\"ez-toc-section-end\"><\/span><\/h2><p>De dissipatiefactor geeft aan hoeveel elektrische energie als warmte verloren gaat wanneer signalen door een di\u00eblektrisch materiaal gaan.<\/p><p>Het wordt soms ook wel aangeduid als:<\/p><ul class=\"wp-block-list\"><li>Verliesfactor<\/li>\n\n<li>Tan \u03b4<\/li>\n\n<li>Di\u00eblektrisch verlies<\/li><\/ul><p>Lagere Df-waarden duiden op minder signaalverlies.<\/p><p>Hogere Df-waarden leiden tot:<\/p><ul class=\"wp-block-list\"><li>Groter invoegverlies<\/li>\n\n<li>Verminderde signaalkwaliteit<\/li>\n\n<li>Kortere transmissieafstanden<\/li><\/ul><p>Typische Df-waarden zijn onder meer:<\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Materiaal<\/td><td>Typische Df<\/td><\/tr><tr><td>FR4<\/td><td>0,015 \u2013 0,025<\/td><\/tr><tr><td>FR4 met hoge TG<\/td><td>0,012 \u2013 0,020<\/td><\/tr><tr><td>Rogers 4350B<\/td><td>0.0037<\/td><\/tr><tr><td>PTFE-materialen<\/td><td>0,0009 \u2013 0,002<\/td><\/tr><tr><td>Megtron 6<\/td><td>0.002<\/td><\/tr><\/tbody><\/table><\/figure><p>Naarmate de gegevenssnelheden toenemen, wordt Df vaak belangrijker dan Dk.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Dk_Matters_in_PCB_Design\"><\/span>Waarom Dk belangrijk is bij het ontwerpen van printplaten<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Impedance_Control\"><\/span>Impedantieregeling<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Structuren met geregelde impedantie zijn sterk afhankelijk van de waarden van de di\u00eblektrische constante.<\/p><p>Veranderingen in Dk hebben rechtstreeks invloed op:<\/p><ul class=\"wp-block-list\"><li>Berekeningen van de spoorbreedte<\/li>\n\n<li>Ontwerp van differenti\u00eble paren<\/li>\n\n<li>Het gedrag van transmissielijnen<\/li><\/ul><p>Zelfs kleine variaties in Dk kunnen de impedantie van het doel be\u00efnvloeden.<\/p><p>Daarom moet bij de ontwikkeling van een stack-up altijd rekening worden gehouden met de werkelijke materiaalgegevens die door de fabrikant van het laminaat worden verstrekt.<\/p><p>De relatie tussen di\u00eblektrische eigenschappen en de afstand tussen de lagen wordt ook besproken in <strong><a href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/pcb-core-and-prepreg\/\">PCB-kern- en prepreg-materialen<\/a><\/strong>.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Signal_Propagation_Delay\"><\/span>Vertraging bij signaaloverdracht<span class=\"ez-toc-section-end\"><\/span><\/h3><p>De signaalsnelheid hangt af van de di\u00eblektrische constante.<\/p><p>Materialen met een lagere Dk zorgen ervoor dat signalen sneller door de printplaat worden geleid.<\/p><p>Dit wordt steeds belangrijker in:<\/p><ul class=\"wp-block-list\"><li>Snelle netwerken<\/li>\n\n<li>AI-servers<\/li>\n\n<li>Apparatuur voor datacenters<\/li>\n\n<li>Backplane-systemen<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"RF_Circuit_Performance\"><\/span>Prestaties van RF-schakelingen<span class=\"ez-toc-section-end\"><\/span><\/h3><p>RF-ingenieurs kiezen materialen vaak mede op basis van de stabiliteit van Dk over verschillende frequentiebereiken.<\/p><p>Het di\u00eblektrische gedrag verbetert:<\/p><ul class=\"wp-block-list\"><li>Antenneprestaties<\/li>\n\n<li>Filterontwerp<\/li>\n\n<li>Faseconsistentie<\/li>\n\n<li>Herhaalbaarheid van RF<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"318\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values-1.jpg\" alt=\"Dk- en Df-waarden\" class=\"wp-image-5934\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values-1-300x159.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values-1-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Df_Matters_in_High-Speed_Design\"><\/span>Waarom Df belangrijk is bij het ontwerpen van systemen met hoge snelheden<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Bij lagere frequenties is het di\u00eblektrische verlies vaak verwaarloosbaar.<\/p><p>Naarmate de frequentie toeneemt, wordt Df echter een belangrijke factor bij het ontwerp.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Signal_Loss\"><\/span>Signaalverlies<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Een hoge Df-waarde leidt tot een grotere demping over lange transmissietrajecten.<\/p><p>Dit kan problemen opleveren bij:<\/p><ul class=\"wp-block-list\"><li>25G-netwerken<\/li>\n\n<li>56G PAM4-systemen<\/li>\n\n<li>112G-backplanes<\/li>\n\n<li>Snelle opslagapparaten<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Eye_Diagram_Performance\"><\/span>Prestaties van het oogdiagram<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Materialen met minder signaalverlies zorgen ervoor dat de signaalgolfvormen zuiverder blijven.<\/p><p>Voordelen zijn onder andere:<\/p><ul class=\"wp-block-list\"><li>Verminderde jitter<\/li>\n\n<li>Een betere blikopener<\/li>\n\n<li>Verbeterde signaalintegriteit<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Longer_Routing_Distances\"><\/span>Langere routeafstanden<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Dankzij materialen met een lage signaalverlies kunnen ontwerpers hogesnelheidssignalen over grotere afstanden leiden zonder dat er overmatige compensatie nodig is.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Dk_and_Df_are_frequency-dependent\"><\/span>Dk en Df zijn frequentieafhankelijk<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Een veelgemaakte fout is te veronderstellen dat Dk en Df vaste waarden zijn.<\/p><p>In werkelijkheid vari\u00ebren beide eigenschappen met:<\/p><ul class=\"wp-block-list\"><li>Frequentie<\/li>\n\n<li>Temperatuur<\/li>\n\n<li>Harssamenstelling<\/li>\n\n<li>Testmethodologie<\/li><\/ul><p>Een materiaal kan bijvoorbeeld het volgende hebben:<\/p><ul class=\"wp-block-list\"><li>Dk gemeten bij 1 GHz<\/li>\n\n<li>Dk gemeten bij 10 GHz<\/li>\n\n<li>Dk gemeten met behulp van verschillende testmethoden<\/li><\/ul><p>Ingenieurs dienen altijd de meetomstandigheden te controleren die in het materiaalgegevensblad worden vermeld.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Typical_Material_Categories\"><\/span>Typische materiaalcategorie\u00ebn<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Standard_FR4\"><\/span>Standaard FR4<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Geschikt voor:<\/p><ul class=\"wp-block-list\"><li>Consumentenelektronica ~4,3-4,8)<\/li>\n\n<li>Producten voor industri\u00eble besturing<\/li>\n\n<li>Printplaten voor algemeen gebruik<\/li><\/ul><p>Voordelen:<\/p><ul class=\"wp-block-list\"><li>Kosteneffectief<\/li>\n\n<li>Overal verkrijgbaar<\/li>\n\n<li>Uitgewerkt productieproces<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High_TG_FR4\"><\/span>FR4 met hoge TG<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Wordt vaak gekozen voor:<\/p><ul class=\"wp-block-list\"><li>Automobielelektronica<\/li>\n\n<li>Energiesystemen<\/li>\n\n<li>Server moederborden<\/li><\/ul><p>Het belangrijkste voordeel is een verbeterde thermische betrouwbaarheid, en niet zozeer een drastisch lager di\u00eblektrisch verlies.<\/p><p>Meer informatie is te vinden in <strong><a href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/high-tg-fr4-pcb\/\">FR4-printplaat met hoge TG-waarde<\/a><\/strong>.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Low-Loss_Materials\"><\/span>Materialen met een lage verliesfactor<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Ontworpen voor:<\/p><ul class=\"wp-block-list\"><li>Netwerkapparatuur<\/li>\n\n<li>Hardware voor datacenters<\/li>\n\n<li>AI-computerplatforms<\/li><\/ul><p>Deze materialen bieden een goede balans tussen kosten en signaalprestaties.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"RF_and_Microwave_Materials\"><\/span>RF- en microgolfmaterialen<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Voorbeelden zijn:<\/p><ul class=\"wp-block-list\"><li>Rogers laminaat<\/li>\n\n<li>Materialen op basis van PTFE<\/li>\n\n<li>Taconic-materialen<\/li><\/ul><p>Deze systemen hebben een zeer laag di\u00eblektrisch verlies en een uitstekende stabiliteit bij hoge frequenties.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Material_Selection_Considerations\"><\/span>Overwegingen bij materiaalselectie<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Bij de keuze van printplaatmaterialen mogen Dk en Df niet afzonderlijk worden beoordeeld.<\/p><p>Andere factoren zijn onder meer:<\/p><ul class=\"wp-block-list\"><li>Werkfrequentie<\/li>\n\n<li>Thermische vereisten<\/li>\n\n<li>Productiecapaciteit<\/li>\n\n<li>Kostendoelstellingen<\/li>\n\n<li>Betrouwbaarheidsverwachtingen<\/li><\/ul><p>Zoals uitgelegd in <strong><a href=\"https:\/\/www.topfastpcb.com\/nl\/blog\/pcb-laminate-materials\/\">Uitleg over PCB-laminaatmaterialen<\/a><\/strong>, bij de materiaalkeuze gaat het altijd om een afweging tussen elektrische prestaties en praktische productieoverwegingen.<\/p><p>Het beste materiaal is niet per se het materiaal met de laagste Df-waarde. Het is het materiaal dat aan de projecteisen voldoet en tegelijkertijd redelijke kosten en productiebetrouwbaarheid garandeert.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Engineering_Misconceptions\"><\/span>Veelvoorkomende misvattingen op het gebied van techniek<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Lower_Dk_Is_Always_Better\"><\/span>Een lagere Dk-waarde is altijd beter<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Niet per se.<\/p><p>Veel ontwerpen werken perfect met FR4-materialen.<\/p><p>Materialen met een lagere Dk-waarde zijn alleen voordelig als de elektrische eisen de extra kosten rechtvaardigen.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Df_Only_Matters_in_RF_Design\"><\/span>Df is alleen van belang bij RF-ontwerp<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Moderne digitale hogesnelheidssystemen kampen vaak met dezelfde problemen op het gebied van signaalverlies als RF-schakelingen.<\/p><p>Df is tegenwoordig een cruciaal aandachtspunt voor veel digitale toepassingen.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"All_FR4_Materials_Have_the_Same_Dk_and_Df\"><\/span>Alle FR4-materialen hebben dezelfde Dk- en Df-waarden<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Verschillende fabrikanten en harssystemen kunnen aanzienlijk uiteenlopende di\u00eblektrische eigenschappen opleveren.<\/p><p>Raadpleeg altijd het gegevensblad van het betreffende materiaal en vertrouw niet op algemene waarden.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"334\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values-2.jpg\" alt=\"Dk- en Df-waarden\" class=\"wp-image-5935\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values-2-300x167.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/Dk-and-Df-Values-2-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2><div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1782366823894\"><strong class=\"schema-faq-question\">V: Wat betekent Dk bij PCB-materialen?<\/strong> <p class=\"schema-faq-answer\">A: Dk is de di\u00eblektrische constante van het materiaal. Deze be\u00efnvloedt de signaalsnelheid, de impedantie en de capaciteit.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782366885560\"><strong class=\"schema-faq-question\">V: Wat betekent Df bij printplaatmaterialen?<\/strong> <p class=\"schema-faq-answer\">A: Df is de dissipatiefactor, die het di\u00eblektrische verlies meet en aangeeft hoeveel signaalenergie in warmte wordt omgezet.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782366895721\"><strong class=\"schema-faq-question\">V: Wat is belangrijker, Dk of Df?<\/strong> <p class=\"schema-faq-answer\">A: Beide zijn belangrijk, maar Df speelt vaak de doorslaggevende rol bij toepassingen met hoge snelheden en hoge frequenties, omdat het rechtstreeks van invloed is op het signaalverlies.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782366907089\"><strong class=\"schema-faq-question\">V: Heeft FR4 een hoge Df-waarde?<\/strong> <p class=\"schema-faq-answer\">A: In vergelijking met gespecialiseerde RF-materialen heeft FR4 een relatief hoge Df-waarde, wat de prestaties bij zeer hoge frequenties kan beperken.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782366959550\"><strong class=\"schema-faq-question\">V: Waarom hebben RF-materialen lagere Df-waarden?<\/strong> <p class=\"schema-faq-answer\">A: RF-materialen zijn zo ontworpen dat di\u00eblektrische verliezen tot een minimum worden beperkt, waardoor de signaalkwaliteit over hoogfrequente transmissiepaden behouden blijft.<\/p> <\/div> <\/div><p><\/p>","protected":false},"excerpt":{"rendered":"<p>De di\u00eblektrische constante (Dk) en de dissipatiefactor (Df) zijn twee van de belangrijkste parameters bij de materiaalkeuze voor printplaten. Ze zijn van invloed op de signaalsnelheid, de impedantieregeling, het invoegverlies en de algehele prestaties van het circuit. Inzicht in hoe Dk en Df vari\u00ebren bij FR4, laminaten met een hoge TG, Rogers-materialen, PTFE en andere systemen met lage verliezen helpt ingenieurs bij het kiezen van het juiste materiaal voor hogesnelheids-, RF- en datacommunicatietoepassingen.<\/p>","protected":false},"author":1,"featured_media":5936,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[487,488,484],"class_list":["post-5932","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-df-values","tag-dk-values","tag-pcb-material"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Dk and Df Values in PCB Materials<\/title>\n<meta name=\"description\" content=\"Dk and Df values in PCB materials, how dielectric constant and dissipation factor affect impedance, signal integrity, insertion loss, 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What does Dk mean in PCB materials?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: Dk is the dielectric constant of the material. It affects signal speed, impedance, and capacitance.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/www.topfastpcb.com\/blog\/dk-and-df-values-in-pcb-materials\/#faq-question-1782366885560","position":2,"url":"https:\/\/www.topfastpcb.com\/blog\/dk-and-df-values-in-pcb-materials\/#faq-question-1782366885560","name":"Q: What does Df mean in PCB materials?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: Df is the dissipation factor, which measures dielectric loss and indicates how much signal energy is converted into heat.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/www.topfastpcb.com\/blog\/dk-and-df-values-in-pcb-materials\/#faq-question-1782366895721","position":3,"url":"https:\/\/www.topfastpcb.com\/blog\/dk-and-df-values-in-pcb-materials\/#faq-question-1782366895721","name":"Q: Which is more important, Dk or Df?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: Both are important, but Df often becomes the dominant factor in high-speed and high-frequency applications because it directly affects signal loss.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/www.topfastpcb.com\/blog\/dk-and-df-values-in-pcb-materials\/#faq-question-1782366907089","position":4,"url":"https:\/\/www.topfastpcb.com\/blog\/dk-and-df-values-in-pcb-materials\/#faq-question-1782366907089","name":"Q: Does FR4 have a high Df value?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: Compared with specialized RF materials, FR4 has a relatively high Df, which can limit performance at very high frequencies.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/www.topfastpcb.com\/blog\/dk-and-df-values-in-pcb-materials\/#faq-question-1782366959550","position":5,"url":"https:\/\/www.topfastpcb.com\/blog\/dk-and-df-values-in-pcb-materials\/#faq-question-1782366959550","name":"Q: Why do RF materials have lower Df values?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: RF materials are engineered to minimize dielectric loss, helping preserve signal quality across high-frequency transmission paths.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"}]}},"_links":{"self":[{"href":"https:\/\/www.topfastpcb.com\/nl\/wp-json\/wp\/v2\/posts\/5932","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.topfastpcb.com\/nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.topfastpcb.com\/nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.topfastpcb.com\/nl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.topfastpcb.com\/nl\/wp-json\/wp\/v2\/comments?post=5932"}],"version-history":[{"count":1,"href":"https:\/\/www.topfastpcb.com\/nl\/wp-json\/wp\/v2\/posts\/5932\/revisions"}],"predecessor-version":[{"id":5937,"href":"https:\/\/www.topfastpcb.com\/nl\/wp-json\/wp\/v2\/posts\/5932\/revisions\/5937"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.topfastpcb.com\/nl\/wp-json\/wp\/v2\/media\/5936"}],"wp:attachment":[{"href":"https:\/\/www.topfastpcb.com\/nl\/wp-json\/wp\/v2\/media?parent=5932"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.topfastpcb.com\/nl\/wp-json\/wp\/v2\/categories?post=5932"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.topfastpcb.com\/nl\/wp-json\/wp\/v2\/tags?post=5932"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}