{"id":1843,"date":"2024-06-22T12:41:52","date_gmt":"2024-06-22T12:41:52","guid":{"rendered":"https:\/\/tryvary.com\/?p=1843"},"modified":"2024-06-22T12:41:52","modified_gmt":"2024-06-22T12:41:52","slug":"copper-clad-laminate-dielectric-constant-values","status":"publish","type":"post","link":"https:\/\/tryvary.com\/cs\/hodnoty-dielektrickych-konstant-laminatu-potazeneho-medi\/","title":{"rendered":"Odhaleny konstantn\u00ed hodnoty dielektrick\u00e9ho dielektrika pota\u017een\u00e9ho m\u011bd\u00ed"},"content":{"rendered":"<p>Lamin\u00e1ty pl\u00e1tovan\u00e9 m\u011bd\u00ed, \u0161iroce pou\u017e\u00edvan\u00e9 v desk\u00e1ch s plo\u0161n\u00fdmi spoji (PCB), vykazuj\u00ed r\u016fzn\u00e9 vlastnosti <strong>hodnoty dielektrick\u00e9 konstanty<\/strong> v z\u00e1vislosti na slo\u017een\u00ed materi\u00e1lu, frekvenci a tlou\u0161\u0165ce, kter\u00e9 maj\u00ed velk\u00fd vliv <strong>integrita sign\u00e1lu<\/strong>&#44; <strong>impedan\u010dn\u00ed p\u0159izp\u016fsoben\u00ed<\/strong>a celkov\u00fd v\u00fdkon PCB. Hodnoty dielektrick\u00e9 konstanty se pohybuj\u00ed od 3,3 do 4,8, ovlivn\u011bn\u00e9 <strong>slo\u017een\u00ed lamin\u00e1tov\u00e9ho materi\u00e1lu<\/strong> a frekven\u010dn\u011b z\u00e1visl\u00e9 chov\u00e1n\u00ed. P\u0159esn\u00e1 kontrola hodnot dielektrick\u00fdch konstant je nezbytn\u00e1 pro optimalizaci n\u00e1vrh\u016f desek plo\u0161n\u00fdch spoj\u016f. Proto\u017ee zm\u011bny frekvence a tlou\u0161\u0165ky ovliv\u0148uj\u00ed hodnoty dielektrick\u00e9 konstanty, pochopen\u00ed t\u011bchto faktor\u016f je d\u016fle\u017eit\u00e9 pro v\u00fdb\u011br materi\u00e1lu a <strong>n\u00e1vrh vysokofrekven\u010dn\u00ed desky plo\u0161n\u00fdch spoj\u016f<\/strong>. Dal\u0161\u00ed pr\u016fzkum odhaluje d\u016fle\u017eitost tepeln\u00fdch, elektrick\u00fdch a hygroskopick\u00fdch vlastnost\u00ed m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f.<\/p>\n<h2>Kl\u00ed\u010dov\u00e9 v\u011bci<\/h2>\n<ul>\n<li>Lamin\u00e1ty FR4 maj\u00ed hodnoty dielektrick\u00e9 konstanty v rozmez\u00ed od 3,3 do 4,8, co\u017e ovliv\u0148uje elektrick\u00e9 vlastnosti a v\u00fdkon PCB.<\/li>\n<li>Hodnoty dielektrick\u00e9 konstanty se u m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f li\u0161\u00ed nap\u0159\u00ed\u010d r\u016fzn\u00fdmi frekvencemi, co\u017e ovliv\u0148uje integritu sign\u00e1lu u vysokorychlostn\u00edch konstrukc\u00ed.<\/li>\n<li>Zm\u011bny tlou\u0161\u0165ky m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f ovliv\u0148uj\u00ed hodnoty dielektrick\u00e9 konstanty, \u0161\u00ed\u0159en\u00ed sign\u00e1lu a impedan\u010dn\u00ed charakteristiky.<\/li>\n<li>P\u0159esn\u00e9 \u0159\u00edzen\u00ed hodnot dielektrick\u00fdch konstant je z\u00e1sadn\u00ed pro optimalizaci n\u00e1vrh\u016f desek plo\u0161n\u00fdch spoj\u016f, zejm\u00e9na ve vysokofrekven\u010dn\u00edch aplikac\u00edch.<\/li>\n<li>R\u016fzn\u00e9 materi\u00e1ly nab\u00edzej\u00ed specifick\u00e9 rozsahy dielektrick\u00fdch konstant pro \u0159e\u0161en\u00ed na m\u00edru, tak\u017ee v\u00fdb\u011br materi\u00e1lu je kritick\u00fd pro vysokofrekven\u010dn\u00ed v\u00fdkon.<\/li>\n<\/ul>\n<h2>Mo\u017enosti materi\u00e1lu lamin\u00e1tu pl\u00e1tovan\u00e9ho m\u011bd\u00ed<\/h2>\n<div class=\"embed-youtube\" style=\"position: relative; width: 100%; height: 0; padding-bottom: 56.25%; margin-bottom:20px;\"><iframe style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%;\" src=\"https:\/\/www.youtube.com\/embed\/h0JaGQP9QAE\" title=\"P\u0159ehr\u00e1va\u010d videa YouTube\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/div>\n<p>Mo\u017enosti lamin\u00e1tov\u00fdch materi\u00e1l\u016f pota\u017een\u00fdch m\u011bd\u00ed zahrnuj\u00ed rozmanitou \u0161k\u00e1lu <strong>substr\u00e1tov\u00e9 formulace<\/strong>, ka\u017ed\u00fd p\u0159izp\u016fsoben\u00fd specifick\u00fdm po\u017eadavk\u016fm na design a v\u00fdrobu desek s plo\u0161n\u00fdmi spoji (PCB). V\u00fdb\u011br vhodn\u00e9ho lamin\u00e1tov\u00e9ho materi\u00e1lu je z\u00e1sadn\u00ed, proto\u017ee p\u0159\u00edmo ovliv\u0148uje elektrick\u00e9 vlastnosti, tepeln\u00e9 vlastnosti a celkov\u00fd v\u00fdkon DPS.<\/p>\n<p>V dom\u00e9n\u011b <strong>vysokofrekven\u010dn\u00ed aplikace<\/strong>lamin\u00e1tov\u00e9 materi\u00e1ly s n\u00edzkou dielektrickou konstantou jsou preferov\u00e1ny pro minimalizaci \u00fatlumu sign\u00e1lu. Naopak, levn\u00e9 mo\u017enosti lamin\u00e1tu mohou b\u00fdt vhodn\u00e9 pro nekritick\u00e9 n\u00e1vrhy PCB.<\/p>\n<p>Lamin\u00e1ty FR4, obl\u00edben\u00e1 volba v pr\u016fmyslu PCB, nab\u00edzej\u00ed spolehlivou rovnov\u00e1hu mezi elektrick\u00fdmi vlastnostmi, tepeln\u00fdmi vlastnostmi a cenou. Vystavuj\u00ed a <strong>dielektrick\u00e1 konstanta<\/strong> v rozmez\u00ed od 3,3 do 4,8, zaji\u0161\u0165uj\u00edc\u00ed spolehliv\u00e9 izola\u010dn\u00ed vlastnosti a a <strong>s\u00edla pr\u016frazn\u00e9ho pole<\/strong> p\u0159ibli\u017en\u011b 20 kV\/mm. S r\u016fznou <strong>teploty skeln\u00e9ho p\u0159echodu<\/strong> a a <strong>T\u0159\u00edda ho\u0159lavosti UL94-V0<\/strong>&#44; <strong>lamin\u00e1ty FR4<\/strong> vyhov\u011bt r\u016fzn\u00fdm po\u017eadavk\u016fm PCB.<\/p>\n<h2>Rozsahy dielektrick\u00fdch konstantn\u00edch hodnot<\/h2>\n<div class=\"body-image-wrapper\" style=\"margin-bottom:20px;\"><img decoding=\"async\" width=\"1006\" height=\"575\" src=\"https:\/\/tryvary.com\/wp-content\/uploads\/2024\/05\/dielectric_constant_definition_and_ranges.jpg\" alt=\"definice dielektrick\u00e9 konstanty a rozsahy\" style=\"aspect-ratio: 16\/9;\"><\/div>\n<p>The <strong>dielektrick\u00e1 konstanta<\/strong> rozsahy hodnot m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f jsou ovlivn\u011bny r\u016fzn\u00fdmi <strong>vlastnosti materi\u00e1lu<\/strong>, co\u017e m\u016f\u017ee ovlivnit v\u00fdkon lamin\u00e1tu v r\u016fzn\u00fdch frekven\u010dn\u00edch rozsaz\u00edch.<\/p>\n<p>N\u00e1sledn\u00e1 diskuse prozkoum\u00e1, jak vlastnosti materi\u00e1l\u016f, <strong>frekven\u010dn\u00ed z\u00e1vislost<\/strong>a zm\u011bny tlou\u0161\u0165ky ovliv\u0148uj\u00ed hodnoty dielektrick\u00e9 konstanty, co\u017e v kone\u010dn\u00e9m d\u016fsledku ovliv\u0148uje celkov\u00fd v\u00fdkon lamin\u00e1tu.<\/p>\n<h3>Vlivy materi\u00e1lov\u00fdch vlastnost\u00ed<\/h3>\n<p>V r\u00e1mci dom\u00e9ny <strong>m\u011bd\u00ed pl\u00e1tovan\u00e9 lamin\u00e1ty<\/strong>, <strong>hodnota dielektrick\u00e9 konstanty<\/strong> rozsahy jsou zna\u010dn\u011b ovlivn\u011bny r\u016fzn\u00fdmi vlastnostmi materi\u00e1l\u016f. Na hodnotu dielektrick\u00e9 konstanty m\u00e1 podstatn\u00fd vliv materi\u00e1lov\u00e9 slo\u017een\u00ed lamin\u00e1tu, v\u010detn\u011b typu a mno\u017estv\u00ed pou\u017eit\u00e9 prysky\u0159ice.<\/p>\n<p>Nap\u0159\u00edklad, <strong>lamin\u00e1t FR4<\/strong> hodnoty dielektrick\u00e9 konstanty se typicky pohybuj\u00ed od 3,3 do 4,8 v z\u00e1vislosti na faktorech, jako je styl vazby a obsah prysky\u0159ice. V porovn\u00e1n\u00ed, <strong>vysoce v\u00fdkonn\u00e9 materi\u00e1ly<\/strong> jako PTFE m\u016f\u017ee nab\u00eddnout ni\u017e\u0161\u00ed hodnoty dielektrick\u00e9 konstanty ve srovn\u00e1n\u00ed se standardn\u00edmi lamin\u00e1ty FR4.<\/p>\n<p>Dielektrick\u00e1 konstanta m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f hraje rozhoduj\u00edc\u00ed roli <strong>integrita sign\u00e1lu<\/strong> v <strong>n\u00e1vrhy vysokorychlostn\u00edch desek plo\u0161n\u00fdch spoj\u016f<\/strong>, jak to ovliv\u0148uje <strong>impedan\u010dn\u00ed p\u0159izp\u016fsoben\u00ed<\/strong> a celkov\u00fd v\u00fdkon obvodu. Zm\u011bny hodnot dielektrick\u00e9 konstanty mohou m\u00edt v\u00fdznamn\u00fd dopad na v\u00fdkon vysokorychlostn\u00edch obvod\u016f, co\u017e podtrhuje d\u016fle\u017eitost p\u0159esn\u00e9ho m\u011b\u0159en\u00ed a \u0159\u00edzen\u00ed hodnot dielektrick\u00e9 konstanty pro optimalizaci n\u00e1vrh\u016f desek plo\u0161n\u00fdch spoj\u016f.<\/p>\n<h3>Rozsah frekven\u010dn\u00ed z\u00e1vislosti<\/h3>\n<p>V \u0161irok\u00e9m rozsahu frekvenc\u00ed, <strong>hodnoty dielektrick\u00e9 konstanty<\/strong> z <strong>lamin\u00e1ty pl\u00e1tovan\u00e9 m\u011bd\u00ed<\/strong> vykazuj\u00ed pozoruhodnou variaci, zd\u016fraz\u0148uj\u00edc\u00ed d\u016fle\u017eitost jejich porozum\u011bn\u00ed <strong>chov\u00e1n\u00ed z\u00e1visl\u00e9 na frekvenci<\/strong> v <strong>n\u00e1vrhy vysokorychlostn\u00edch desek plo\u0161n\u00fdch spoj\u016f<\/strong>.<\/p>\n<p>Tento frekven\u010dn\u011b z\u00e1visl\u00fd rozsah m\u00e1 pozoruhodn\u00fd dopad na <strong>\u00favahy o integrit\u011b sign\u00e1lu<\/strong>, proto\u017ee zm\u011bny hodnot dielektrick\u00e9 konstanty mohou ovlivnit v\u00fdkon elektronick\u00fdch obvod\u016f. P\u0159esn\u00e1 znalost rozsah\u016f hodnot dielektrick\u00e9 konstanty je nezbytn\u00e1 pro v\u00fdb\u011br materi\u00e1lu ve specifick\u00fdch aplikac\u00edch, kde m\u016f\u017ee v\u00e9st k nespr\u00e1vn\u00e9 volb\u011b <strong>ohro\u017een\u00fd v\u00fdkon<\/strong>.<\/p>\n<p>Hodnoty dielektrick\u00e9 konstanty r\u016fzn\u00fdch m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f se mohou v\u00fdrazn\u011b li\u0161it v r\u00e1mci specifick\u00e9ho frekven\u010dn\u00edho rozsahu, tak\u017ee je nezbytn\u00e9 pochopit jejich frekven\u010dn\u011b z\u00e1visl\u00e9 chov\u00e1n\u00ed. Toto pochopen\u00ed je kritick\u00e9 u vysokorychlostn\u00edch n\u00e1vrh\u016f desek plo\u0161n\u00fdch spoj\u016f, kde jsou prvo\u0159ad\u00e9 po\u017eadavky na integritu sign\u00e1lu.<\/p>\n<h3>Vliv zm\u011bny tlou\u0161\u0165ky<\/h3>\n<p>Zm\u011bny tlou\u0161\u0165ky lamin\u00e1tu s m\u011bd\u00ed velmi ovliv\u0148uj\u00ed hodnoty dielektrick\u00e9 konstanty, co\u017e zase ovliv\u0148uje \u0161\u00ed\u0159en\u00ed sign\u00e1lu a impedan\u010dn\u00ed charakteristiky u vysokorychlostn\u00edch n\u00e1vrh\u016f desek plo\u0161n\u00fdch spoj\u016f. Hodnoty dielektrick\u00e9 konstanty pro lamin\u00e1ty pl\u00e1tovan\u00e9 m\u011bd\u00ed se mohou li\u0161it v z\u00e1vislosti na tlou\u0161\u0165ce, s typick\u00fdmi rozsahy od 3,3 do 4,8. Tlust\u0161\u00ed m\u011bd\u011bn\u00e9 pl\u00e1tovan\u00e9 lamin\u00e1ty maj\u00ed tendenci vykazovat vy\u0161\u0161\u00ed dielektrick\u00e9 konstanty v r\u00e1mci specifikovan\u00e9ho rozsahu v d\u016fsledku zv\u00fd\u0161en\u00e9ho objemu materi\u00e1lu.<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: center\">Tlou\u0161\u0165ka (mm)<\/th>\n<th style=\"text-align: center\">Dielektrick\u00fd konstantn\u00ed rozsah<\/th>\n<th style=\"text-align: center\">Objem materi\u00e1lu<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: center\">0.5<\/td>\n<td style=\"text-align: center\">3.3-3.8<\/td>\n<td style=\"text-align: center\">N\u00edzk\u00fd<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\">1.0<\/td>\n<td style=\"text-align: center\">3.5-4.2<\/td>\n<td style=\"text-align: center\">St\u0159edn\u00ed<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\">1.5<\/td>\n<td style=\"text-align: center\">3.8-4.5<\/td>\n<td style=\"text-align: center\">Vysok\u00fd<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\">2.0<\/td>\n<td style=\"text-align: center\">4.0-4.8<\/td>\n<td style=\"text-align: center\">Velmi vysoko<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Pochopen\u00ed zm\u011bn dielektrick\u00e9 konstanty v m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1tech je z\u00e1sadn\u00ed pro vysokorychlostn\u00ed n\u00e1vrhy PCB vy\u017eaduj\u00edc\u00ed p\u0159esnou integritu sign\u00e1lu a \u0159\u00edzen\u00ed impedance. Hodnoty dielektrick\u00e9 konstanty v m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1tech hraj\u00ed v\u00fdznamnou roli p\u0159i ur\u010dov\u00e1n\u00ed elektrick\u00e9ho v\u00fdkonu a celkov\u00e9 funk\u010dnosti desek plo\u0161n\u00fdch spoj\u016f. Rozpozn\u00e1n\u00edm vlivu kol\u00eds\u00e1n\u00ed tlou\u0161\u0165ky na hodnoty dielektrick\u00e9 konstanty mohou n\u00e1vrh\u00e1\u0159i vylep\u0161it sv\u00e9 n\u00e1vrhy desek plo\u0161n\u00fdch spoj\u016f pro \u0161pi\u010dkov\u00fd elektrick\u00fd v\u00fdkon.<\/p>\n<h2>Tepeln\u00e9 a elektrick\u00e9 vlastnosti<\/h2>\n<div class=\"body-image-wrapper\" style=\"margin-bottom:20px;\"><img decoding=\"async\" width=\"1006\" height=\"575\" src=\"https:\/\/tryvary.com\/wp-content\/uploads\/2024\/05\/material_characteristics_in_depth.jpg\" alt=\"materi\u00e1lov\u00e9 vlastnosti do hloubky\" style=\"aspect-ratio: 16\/9;\"><\/div>\n<p>V oblasti tepeln\u00fdch a elektrick\u00fdch vlastnost\u00ed, <strong>m\u011bd\u00ed pl\u00e1tovan\u00e9 lamin\u00e1ty<\/strong> vykazuj\u00ed z\u0159etelnou sadu charakteristik, kter\u00e9 jsou z\u00e1sadn\u00ed pro pochopen\u00ed jejich v\u00fdkonu v aplikac\u00edch desek plo\u0161n\u00fdch spoj\u016f (PCB). The <strong>tepeln\u00e1 vodivost<\/strong> t\u011bchto lamin\u00e1t\u016f, kter\u00e1 je ovlivn\u011bna faktory, jako je obsah prysky\u0159ice a materi\u00e1lov\u00e9 slo\u017een\u00ed, hraje kl\u00ed\u010dovou roli v odvodu tepla.<\/p>\n<p>Co se t\u00fd\u010de dielektrick\u00fdch vlastnost\u00ed, lamin\u00e1ty pl\u00e1tovan\u00e9 m\u011bd\u00ed vykazuj\u00ed rozsah dielektrick\u00e9 konstanty (Dk) 3,3 a\u017e 4,8, d\u00edky \u010demu\u017e jsou vhodn\u00e9 pro r\u016fzn\u00e9 aplikace PCB. <strong>lamin\u00e1ty FR4<\/strong>, b\u011b\u017en\u00fd typ m\u011bd\u00ed pl\u00e1tovan\u00e9ho lamin\u00e1tu, nab\u00edz\u00ed standardn\u00ed tlou\u0161\u0165ku 1,57 mm a a <strong>stupe\u0148 ho\u0159lavosti UL94-V0<\/strong>. Tyto lamin\u00e1ty tak\u00e9 vykazuj\u00ed teplotu skla (Tg) p\u0159ibli\u017en\u011b 130 \u00b0C pro varianty s n\u00edzkou Tg a p\u0159ibli\u017en\u011b 170 \u00b0C pro varianty s vysokou Tg.<\/p>\n<p>The <strong>s\u00edla pr\u016frazn\u00e9ho pole<\/strong> p\u0159ibli\u017en\u011b 20 kV\/mm zv\u00fdraz\u0148uje jejich <strong>elektrick\u00e1 izola\u010dn\u00ed schopnost<\/strong>. Pochopen\u00ed t\u011bchto tepeln\u00fdch a elektrick\u00fdch vlastnost\u00ed je nezbytn\u00e9 pro navrhov\u00e1n\u00ed spolehliv\u00fdch a \u00fa\u010dinn\u00fdch desek plo\u0161n\u00fdch spoj\u016f. Zv\u00e1\u017een\u00edm t\u011bchto vlastnost\u00ed mohou n\u00e1vrh\u00e1\u0159i optimalizovat sv\u00e9 <strong>n\u00e1vrhy desek plo\u0161n\u00fdch spoj\u016f<\/strong> a zajistit \u0161pi\u010dkov\u00fd v\u00fdkon.<\/p>\n<h2>Chemick\u00e9 vlastnosti a absorpce vlhkosti<\/h2>\n<div class=\"body-image-wrapper\" style=\"margin-bottom:20px;\"><img decoding=\"async\" width=\"1006\" height=\"575\" src=\"https:\/\/tryvary.com\/wp-content\/uploads\/2024\/05\/chemical_properties_absorption_study.jpg\" alt=\"chemick\u00e9 vlastnosti absorp\u010dn\u00ed studie\" style=\"aspect-ratio: 16\/9;\"><\/div>\n<p>P\u0159i hodnocen\u00ed chemick\u00fdch vlastnost\u00ed m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f je nezbytn\u00e9 vz\u00edt v \u00favahu vliv chemick\u00e9 struktury na <strong>hodnoty dielektrick\u00e9 konstanty<\/strong>.<\/p>\n<p>M\u00edra <strong>absorpce vlhkosti<\/strong> a hygroskopick\u00e9 vlastnosti t\u011bchto materi\u00e1l\u016f tak\u00e9 hraj\u00ed rozhoduj\u00edc\u00ed roli p\u0159i ur\u010dov\u00e1n\u00ed jejich vhodnosti pro specifick\u00e9 aplikace PCB.<\/p>\n<h3>Vliv chemick\u00e9 struktury<\/h3>\n<p>The <strong>dielektrick\u00e1 konstanta<\/strong> z <strong>lamin\u00e1t pota\u017een\u00fd m\u011bd\u00ed<\/strong> materi\u00e1ly je zna\u010dn\u011b ovlivn\u011bno jejich <strong>chemick\u00e1 struktura<\/strong>, kter\u00e9 mohou b\u00fdt p\u0159izp\u016fsobeny prost\u0159ednictv\u00edm strategick\u00e9ho v\u00fdb\u011bru <strong>typy prysky\u0159ic<\/strong> a <strong>p\u0159\u00edsady<\/strong>. Tato chemick\u00e1 struktura m\u00e1 podstatn\u00fd vliv na hodnoty dielektrick\u00e9 konstanty, v kone\u010dn\u00e9m d\u016fsledku ovliv\u0148uje <strong>integrita sign\u00e1lu<\/strong> v aplikac\u00edch PCB. Zm\u011bny v chemick\u00e9m slo\u017een\u00ed mohou zm\u011bnit dielektrickou konstantu lamin\u00e1t\u016f, co\u017e vede k nestabiln\u00edmu p\u0159enosu sign\u00e1lu.<\/p>\n<p>R\u016fzn\u00e9 typy prysky\u0159ic a p\u0159\u00edsad hraj\u00ed d\u016fle\u017eitou roli p\u0159i ur\u010dov\u00e1n\u00ed dielektrick\u00e9 konstanty m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f. Pochopen\u00edm chemick\u00fdch vlastnost\u00ed lamin\u00e1t\u016f mohou v\u00fdrobci ovl\u00e1dat <strong>absorpce vlhkosti<\/strong>, kter\u00fd m\u016f\u017ee zm\u011bnit hodnoty dielektrick\u00fdch konstant. Monitorov\u00e1n\u00ed \u00farovn\u00ed absorpce vlhkosti je nezbytn\u00e9 pro udr\u017een\u00ed stabiln\u00edch hodnot dielektrick\u00e9 konstanty v lamin\u00e1tov\u00fdch materi\u00e1lech pota\u017een\u00fdch m\u011bd\u00ed.<\/p>\n<p>To je zvl\u00e1\u0161t\u011b d\u016fle\u017eit\u00e9 v aplikac\u00edch PCB, kde integrita sign\u00e1lu z\u00e1vis\u00ed na stabiln\u00ed dielektrick\u00e9 konstant\u011b. Optimalizac\u00ed chemick\u00e9 struktury m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f mohou v\u00fdrobci zajistit <strong>spolehliv\u00fd p\u0159enos sign\u00e1lu<\/strong> a udr\u017eovat integritu sv\u00fdch aplikac\u00ed PCB.<\/p>\n<h3>M\u00edra absorpce vlhkosti<\/h3>\n<p>M\u00edra absorpce vlhkosti, z\u00e1kladn\u00ed faktor ovliv\u0148uj\u00edc\u00ed v\u00fdkon dielektrick\u00e9ho materi\u00e1lu, v\u00fdrazn\u011b ovliv\u0148uje spolehlivost a stabilitu m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f v aplikac\u00edch PCB. Schopnost dielektrick\u00e9ho materi\u00e1lu absorbovat vlhkost v\u00fdrazn\u011b ovliv\u0148uje jeho dielektrickou konstantu, co\u017e vede k degradaci sign\u00e1lu a kol\u00eds\u00e1n\u00ed spolehlivosti v\u00fdkonu. N\u00edzk\u00e1 m\u00edra absorpce vlhkosti je z\u00e1sadn\u00ed pro udr\u017een\u00ed stabiln\u00edch dielektrick\u00fdch vlastnost\u00ed, co\u017e zaru\u010duje dlouhodobou funk\u010dnost v aplikac\u00edch PCB.<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: center\">Typ materi\u00e1lu<\/th>\n<th style=\"text-align: center\">M\u00edra absorpce vlhkosti (%)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: center\">FR4<\/td>\n<td style=\"text-align: center\">0.15 &#8211; 0.30<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\">FR5<\/td>\n<td style=\"text-align: center\">0.10 &#8211; 0.20<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\">Polyimid<\/td>\n<td style=\"text-align: center\">0.05 &#8211; 0.15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Spr\u00e1vn\u00e9 vyhodnocen\u00ed rychlosti absorpce vlhkosti je rozhoduj\u00edc\u00ed p\u0159i v\u00fdb\u011bru vhodn\u00fdch dielektrick\u00fdch materi\u00e1l\u016f pro specifick\u00e9 po\u017eadavky na n\u00e1vrh desek plo\u0161n\u00fdch spoj\u016f. Pochopen\u00edm charakteristik absorpce vlhkosti m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1tov\u00fdch materi\u00e1l\u016f mohou konstrukt\u00e9\u0159i zajistit spolehliv\u00fd v\u00fdkon sv\u00fdch desek plo\u0161n\u00fdch spoj\u016f v pr\u016fb\u011bhu \u010dasu. V\u00fd\u0161e uveden\u00e1 tabulka ilustruje r\u016fzn\u00e9 rychlosti absorpce vlhkosti u r\u016fzn\u00fdch typ\u016f materi\u00e1l\u016f a zd\u016fraz\u0148uje d\u016fle\u017eitost v\u00fdb\u011bru materi\u00e1lu pro udr\u017een\u00ed stabiln\u00edch dielektrick\u00fdch vlastnost\u00ed.<\/p>\n<h3>Hygroskopick\u00e9 vlastnosti<\/h3>\n<p>Inherentn\u00ed k <strong>m\u011bd\u00ed pl\u00e1tovan\u00e9 lamin\u00e1ty<\/strong> je sklon k <strong>absorbovat vlhkost<\/strong>, co\u017e je vlastnost, kter\u00e1 v\u00fdrazn\u011b ovliv\u0148uje jejich <strong>dielektrick\u00e9 vlastnosti<\/strong> a celkov\u00fd v\u00fdkon v aplikac\u00edch PCB. Tento <strong>hygroskopick\u00e1 vlastnost<\/strong> je d\u016fle\u017eit\u00fdm aspektem chov\u00e1n\u00ed lamin\u00e1tu, proto\u017ee p\u0159\u00edmo ovliv\u0148uje <strong>integrita sign\u00e1lu<\/strong> a spolehlivost.<\/p>\n<p>Absorpce vlhkosti m\u016f\u017ee zm\u011bnit dielektrickou konstantu, co\u017e vede k nep\u0159edv\u00eddatelnosti <strong>elektrick\u00e9 charakteristiky<\/strong> a naru\u0161en\u00e1 integrita sign\u00e1lu. V d\u016fsledku toho m\u011bd\u00ed pl\u00e1tovan\u00e9 lamin\u00e1ty s n\u00edzkou <strong>m\u00edra absorpce vlhkosti<\/strong> jsou preferov\u00e1ny pro <strong>vysoce v\u00fdkonn\u00e9 aplikace<\/strong>, kde jsou prvo\u0159ad\u00e9 stabiln\u00ed elektrick\u00e9 charakteristiky.<\/p>\n<p>Pochopen\u00ed hygroskopick\u00fdch vlastnost\u00ed lamin\u00e1t\u016f je pro \u00fadr\u017ebu z\u00e1sadn\u00ed <strong>spolehliv\u00fd v\u00fdkon<\/strong> p\u0159es\u010das. V\u00fdrobci specifikuj\u00ed \u00farovn\u011b absorpce vlhkosti, aby byla zaru\u010dena spolehlivost a v\u00fdkon m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f. \u0158\u00edzen\u00edm absorpce vlhkosti mohou v\u00fdrobci zajistit stabiln\u00ed elektrick\u00e9 charakteristiky, kter\u00e9 jsou nezbytn\u00e9 pro vysoce v\u00fdkonn\u00e9 aplikace.<\/p>\n<p>V t\u011bchto n\u00e1ro\u010dn\u00fdch prost\u0159ed\u00edch mohou m\u00edt i nepatrn\u00e9 zm\u011bny dielektrick\u00e9 konstanty v\u00fdznamn\u00e9 d\u016fsledky. Proto je d\u016fkladn\u00e9 pochopen\u00ed hygroskopick\u00fdch vlastnost\u00ed kl\u00ed\u010dov\u00e9 pro optimalizaci v\u00fdkonu lamin\u00e1tu a zaji\u0161t\u011bn\u00ed spolehlivosti PCB ve vysoce nam\u00e1han\u00fdch aplikac\u00edch.<\/p>\n<h2>Pr\u016fvodce v\u00fdb\u011brem vysokofrekven\u010dn\u00edho materi\u00e1lu<\/h2>\n<div class=\"body-image-wrapper\" style=\"margin-bottom:20px;\"><img decoding=\"async\" width=\"1006\" height=\"575\" src=\"https:\/\/tryvary.com\/wp-content\/uploads\/2024\/05\/material_selection_for_high_frequency.jpg\" alt=\"v\u00fdb\u011br materi\u00e1lu pro vysokou frekvenci\" style=\"aspect-ratio: 16\/9;\"><\/div>\n<p>Pro <strong>ide\u00e1ln\u00ed vysokofrekven\u010dn\u00ed v\u00fdkon<\/strong>, v\u00fdb\u011br materi\u00e1l\u016f s vhodn\u00fdmi <strong>hodnoty dielektrick\u00e9 konstanty<\/strong> je z\u00e1sadn\u00ed, proto\u017ee p\u0159\u00edmo ovliv\u0148uj\u00ed <strong>integrita a ztr\u00e1ta sign\u00e1lu<\/strong>.<\/p>\n<p>A <strong>pr\u016fvodce v\u00fdb\u011brem vysokofrekven\u010dn\u00edho materi\u00e1lu<\/strong> je d\u016fle\u017eit\u00e9 p\u0159i v\u00fdb\u011bru dielektrick\u00fdch materi\u00e1l\u016f s n\u00edzk\u00fdmi hodnotami dielektrick\u00e9 konstanty, kter\u00e9 jsou rozhoduj\u00edc\u00ed pro nejlep\u0161\u00ed p\u0159enos sign\u00e1lu.<\/p>\n<p>Hodnoty dielektrick\u00e9 konstanty hraj\u00ed v\u00fdznamnou roli v integrit\u011b sign\u00e1lu a vysokofrekven\u010dn\u00edm v\u00fdkonu, tak\u017ee je d\u016fle\u017eit\u00e9 pochopit jejich vliv na <strong>vysokorychlostn\u00ed desky plo\u0161n\u00fdch spoj\u016f<\/strong>.<\/p>\n<p>Nejlep\u0161\u00ed v\u00fdb\u011br materi\u00e1lu zaru\u010duje <strong>minim\u00e1ln\u00ed ztr\u00e1ta sign\u00e1lu<\/strong> a efektivn\u00ed vysokofrekven\u010dn\u00ed provoz.<\/p>\n<p>R\u016fzn\u00e9 materi\u00e1ly nab\u00edzej\u00ed specifick\u00e9 rozsahy dielektrick\u00e9 konstanty, co\u017e umo\u017e\u0148uje p\u0159izp\u016fsoben\u00ed <strong>vysokofrekven\u010dn\u00ed \u0159e\u0161en\u00ed<\/strong>.<\/p>\n<p>D\u00edky pochopen\u00ed hodnot dielektrick\u00fdch konstant mohou n\u00e1vrh\u00e1\u0159i vytv\u00e1\u0159et vysokorychlostn\u00ed desky plo\u0161n\u00fdch spoj\u016f pro r\u016fzn\u00e9 aplikace, kter\u00e9 zaji\u0161\u0165uj\u00ed spolehliv\u00fd a \u00fa\u010dinn\u00fd p\u0159enos sign\u00e1lu.<\/p>\n<p>Podrobn\u00fd pr\u016fvodce v\u00fdb\u011brem materi\u00e1lu pom\u00e1h\u00e1 p\u0159i manipulaci se slo\u017eitost\u00ed dielektrick\u00fdch materi\u00e1l\u016f a umo\u017e\u0148uje konstrukt\u00e9r\u016fm \u010dinit informovan\u00e1 rozhodnut\u00ed pro vynikaj\u00edc\u00ed vysokofrekven\u010dn\u00ed v\u00fdkon.<\/p>\n<h2>D\u016fsledky a \u00favahy o n\u00e1vrhu PCB<\/h2>\n<div class=\"body-image-wrapper\" style=\"margin-bottom:20px;\"><img decoding=\"async\" width=\"1006\" height=\"575\" src=\"https:\/\/tryvary.com\/wp-content\/uploads\/2024\/05\/electronics_design_and_layout.jpg\" alt=\"n\u00e1vrh a uspo\u0159\u00e1d\u00e1n\u00ed elektroniky\" style=\"aspect-ratio: 16\/9;\"><\/div>\n<p>P\u0159i navrhov\u00e1n\u00ed vysokorychlostn\u00edch desek plo\u0161n\u00fdch spoj\u016f je t\u0159eba pe\u010dliv\u011b zv\u00e1\u017eit hodnoty dielektrick\u00e9 konstanty m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f, aby se zm\u00edrnila degradace sign\u00e1lu a zajistil se \u0161pi\u010dkov\u00fd v\u00fdkon. To je zvl\u00e1\u0161t\u011b d\u016fle\u017eit\u00e9 ve vysokofrekven\u010dn\u00edch aplikac\u00edch, kde je prvo\u0159ad\u00e1 integrita sign\u00e1lu a \u0159\u00edzen\u00ed impedance.<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: center\">Dielektrick\u00fd materi\u00e1l<\/th>\n<th style=\"text-align: center\">Dielektrick\u00e1 konstanta (Dk)<\/th>\n<th style=\"text-align: center\">\u0158\u00edzen\u00ed impedance<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: center\">FR4<\/td>\n<td style=\"text-align: center\">3.3-4.8<\/td>\n<td style=\"text-align: center\">M\u00edrn\u00fd<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\">Materi\u00e1l s n\u00edzk\u00fdm obsahem Dk<\/td>\n<td style=\"text-align: center\">2.5-3.0<\/td>\n<td style=\"text-align: center\">Vysok\u00fd<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\">Vysokofrekven\u010dn\u00ed materi\u00e1l<\/td>\n<td style=\"text-align: center\">2.0-2.5<\/td>\n<td style=\"text-align: center\">Vynikaj\u00edc\u00ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Aby byl zaji\u0161t\u011bn \u0161pi\u010dkov\u00fd v\u00fdkon desek plo\u0161n\u00fdch spoj\u016f, mus\u00ed n\u00e1vrh\u00e1\u0159i dodr\u017eovat pokyny pro n\u00e1vrh desek plo\u0161n\u00fdch spoj\u016f, kter\u00e9 zohled\u0148uj\u00ed zm\u011bny dielektrick\u00e9 konstanty v lamin\u00e1tech. To zahrnuje v\u00fdb\u011br dielektrick\u00fdch materi\u00e1l\u016f s n\u00edzk\u00fdmi hodnotami Dk pro minimalizaci vlo\u017en\u00fdch ztr\u00e1t a zaru\u010den\u00ed \u0159\u00edzen\u00e9 impedance. T\u00edmto zp\u016fsobem lze p\u0159ekonat omezen\u00ed vysokorychlostn\u00edho n\u00e1vrhu a lze zachovat integritu sign\u00e1lu.<\/p>\n<p>Ve vysokofrekven\u010dn\u00edch aplikac\u00edch je \u0159\u00edzen\u00ed impedance z\u00e1sadn\u00ed, aby se zabr\u00e1nilo degradaci sign\u00e1lu. P\u0159esn\u00e9 m\u011b\u0159en\u00ed a kontrola hodnot dielektrick\u00e9 konstanty jsou z\u00e1sadn\u00ed pro optimalizaci v\u00fdkonu desky plo\u0161n\u00fdch spoj\u016f. Zv\u00e1\u017een\u00edm hodnot dielektrick\u00e9 konstanty m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f mohou n\u00e1vrh\u00e1\u0159i vytvo\u0159it vysoce v\u00fdkonn\u00e9 desky plo\u0161n\u00fdch spoj\u016f, kter\u00e9 spl\u0148uj\u00ed po\u017eadavky vysokorychlostn\u00edho n\u00e1vrhu.<\/p>\n<h2>\u010casto kladen\u00e9 ot\u00e1zky<\/h2>\n<h3>Jak\u00e1 je hodnota dielektrick\u00e9 konstanty m\u011bdi?<\/h3>\n<p>D\u016fle\u017eit\u00e9 je, \u017ee elektronick\u00e9 obvody 90% spol\u00e9haj\u00ed na v\u00fdjime\u010dnou vodivost m\u011bdi. Ohledn\u011b <strong>dielektrick\u00e1 konstanta<\/strong> m\u011bdi je p\u0159ibli\u017en\u011b 1, co\u017e je v\u00fdrazn\u011b m\u00e9n\u011b ne\u017e u izola\u010dn\u00edch materi\u00e1l\u016f.<\/p>\n<p>Tato n\u00edzk\u00e1 hodnota ukazuje na omezenou schopnost m\u011bdi ukl\u00e1dat <strong>elektrick\u00e1 energie<\/strong>, co\u017e z n\u011bj d\u011bl\u00e1 vynikaj\u00edc\u00ed dirigent pro efektivn\u00ed <strong>p\u0159enos sign\u00e1lu<\/strong>. Tato vlastnost je z\u00e1sadn\u00ed pro vysokorychlostn\u00ed elektronick\u00e9 obvody, proto\u017ee minimalizuje ztr\u00e1ty sign\u00e1lu a zkreslen\u00ed.<\/p>\n<h3>Jak\u00e1 je dielektrick\u00e1 konstanta m\u011bd\u011bn\u00e9 desky s plo\u0161n\u00fdmi spoji?<\/h3>\n<p>The <strong>dielektrick\u00e1 konstanta<\/strong> M\u011bd\u011bn\u00e1 deska plo\u0161n\u00fdch spoj\u016f, kritick\u00fd parametr p\u0159i n\u00e1vrhu desky s plo\u0161n\u00fdmi spoji, obvykle spad\u00e1 do rozsahu 3,3 a\u017e 4,8.<\/p>\n<p>Tato variabilita je p\u0159ipisov\u00e1na faktor\u016fm, jako je styl vazby, obsah prysky\u0159ice a materi\u00e1lov\u00e9 slo\u017een\u00ed.<\/p>\n<p>Pochopen\u00ed specifick\u00e9 hodnoty dielektrick\u00e9 konstanty je kl\u00ed\u010dov\u00e9 pro maximalizaci v\u00fdkonu PCB, proto\u017ee m\u00e1 p\u0159\u00edm\u00fd dopad <strong>integrita sign\u00e1lu<\/strong> a <strong>elektromagnetick\u00e9 ru\u0161en\u00ed<\/strong>.<\/p>\n<h3>Kter\u00fd materi\u00e1l PCB m\u00e1 vysokou dielektrickou konstantu?<\/h3>\n<p>P\u0159i v\u00fdb\u011bru materi\u00e1lu PCB <strong>vysok\u00e9 dielektrick\u00e9 konstanty<\/strong> jsou \u010dasto \u017e\u00e1douc\u00ed pro vlastnosti \u0159\u00edzen\u00e9 impedance a p\u0159enosu sign\u00e1lu.<\/p>\n<p>Mezi r\u016fzn\u00fdmi materi\u00e1ly PCB, <strong>lamin\u00e1ty s vysokou Tg FR4<\/strong> typicky vykazuj\u00ed vy\u0161\u0161\u00ed dielektrick\u00e9 konstanty v rozmez\u00ed od 4,2 do 4,8.<\/p>\n<p>N\u011bkter\u00e9 lamin\u00e1ty pl\u00e1tovan\u00e9 m\u011bd\u00ed jsou nav\u00edc navr\u017eeny tak, aby m\u011bly vysok\u00e9 dielektrick\u00e9 konstanty, d\u00edky \u010demu\u017e jsou vhodn\u00e9 pro konkr\u00e9tn\u00ed n\u00e1vrhy.<\/p>\n<p>Zejm\u00e9na lamin\u00e1ty Rogers jsou zn\u00e1m\u00e9 sv\u00fdmi vysok\u00fdmi dielektrick\u00fdmi konstantami, \u010dasto p\u0159esahuj\u00edc\u00edmi 4,5.<\/p>\n<h3>Jak\u00e9 jsou dielektrick\u00e9 vlastnosti m\u011bdi?<\/h3>\n<p>\u201ePt\u00e1k v ruce stoj\u00ed v k\u0159ov\u00ed za dva,\u201c zd\u016fraz\u0148uje d\u016fle\u017eitost porozum\u011bn\u00ed m\u011bdi <strong>dielektrick\u00e9 vlastnosti<\/strong>.<\/p>\n<p>The <strong>dielektrick\u00e1 konstanta<\/strong> m\u011bdi je p\u0159ibli\u017en\u011b 1, co\u017e je v\u00fdrazn\u011b n\u00edzk\u00e1 hodnota ve srovn\u00e1n\u00ed s v\u011bt\u0161inou dielektrick\u00fdch materi\u00e1l\u016f.<\/p>\n<p>Tato n\u00edzk\u00e1 dielektrick\u00e1 konstanta je z\u00e1sadn\u00ed pro minimalizaci ztr\u00e1ty sign\u00e1lu a ru\u0161en\u00ed ve vysokofrekven\u010dn\u00edch aplikac\u00edch, co\u017e p\u0159isp\u00edv\u00e1 ke zlep\u0161en\u00ed <strong>integrita sign\u00e1lu<\/strong> a vysokorychlostn\u00ed v\u00fdkon v elektronick\u00fdch obvodech.<\/p>","protected":false},"excerpt":{"rendered":"<p>Pohledy na r\u016fzn\u00e9 hodnoty dielektrick\u00e9 konstanty m\u011bd\u00ed pl\u00e1tovan\u00fdch lamin\u00e1t\u016f a jejich dopad na v\u00fdkon PCB \u010dekaj\u00ed na objeven\u00ed.<\/p>","protected":false},"author":9,"featured_media":1842,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","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-4)","background-image":"","background-repeat":"repeat","background-position":"center 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Lau","author_link":"https:\/\/tryvary.com\/cs\/author\/wsbpmbzuog4q\/"},"uagb_comment_info":0,"uagb_excerpt":"Insights into the varying dielectric constant values of copper clad laminates and their impact on PCB performance await discovery.","_links":{"self":[{"href":"https:\/\/tryvary.com\/cs\/wp-json\/wp\/v2\/posts\/1843","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tryvary.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tryvary.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tryvary.com\/cs\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/tryvary.com\/cs\/wp-json\/wp\/v2\/comments?post=1843"}],"version-history":[{"count":1,"href":"https:\/\/tryvary.com\/cs\/wp-json\/wp\/v2\/posts\/1843\/revisions"}],"predecessor-version":[{"id":2460,"href":"https:\/\/tryvary.com\/cs\/wp-json\/wp\/v2\/posts\/1843\/revisions\/2460"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tryvary.com\/cs\/wp-json\/wp\/v2\/media\/1842"}],"wp:attachment":[{"href":"https:\/\/tryvary.com\/cs\/wp-json\/wp\/v2\/media?parent=1843"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tryvary.com\/cs\/wp-json\/wp\/v2\/categories?post=1843"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tryvary.com\/cs\/wp-json\/wp\/v2\/tags?post=1843"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}