FR4 Dielectric Constant Calculator uye PCB Design Guide

Fomura yeFR4 dielectric constant uye PCB copper traces
HIGHLEAP ELECTRONICS · CHISHANDISO CHEUINJINIYERI CHEPCB CHEMAHARA

Chii chinonzi dielectric constant yeFR4? Ma laminates akajairika eFR4 anowira paDk 4.0–4.5, asi kukosha kwakakodzera kunoenderana nekugadzirwa kwezvinhu uye frequency. Shandisa karukureta iri pazasi kuti ufungidzire kunonoka kwechiratidzo, velocity, guided wavelength uye preliminary microstrip impedance.

CHIKAMU CHEKUVERENGA MHENYU

FR4 Dielectric Constant Calculator

Chinja chero zvawapinda. Mhedzisiro inovandudzwa nekukasika—hapana kunyoresa, kudzoreredza peji, kana sevhisi yekunze.

Microstrip inoshandisa nzira inoshanda yekubvumidza. Stripline inofungidzira kuti FR4 yakafanana.
Edza Dr:
Mafambiro enguva haachinji otomatiki. Isa Dr yakayerwa pahuwandu hwaunoda; uchichinja wavelength uye phase yeGHz updates chete. Ma presets maviri e370HR anoshandisa ma values ​​akaburitswa nemugadziri kune imwe frequency. 1 × 1080, 58% resin kuvaka.
ZVINHU A · ZVINHU ZVAKAVERERWA
Chinyorwa chekarukureta hachina kuiswa — ona mirairo yekuisa
Kunonoka kwekuparadzira kwechirwere nenzira imwe chete
- ps

Kureba kwekutevera kwawakaita

Kushanda kweDk (εeff)-
Kumhanya kwekupararira- mm/ns
Kunonoka pa mm- ps/mm
Kutenderera kwehurefu kunotungamirirwa- mm
Kureba kwemagetsi- °
CHINHU A vs. CHINHU B
ParameterZvinyorwa AZvinyorwa B
Dr yakawanda--
Kushanda Drk--
Kunonoka (ps)--
Musiyano wekunonoka (A − B)- ps
Kufungidzira kwakakodzera, kwete kuyerwa kwePCB kwakavimbiswa kana kukosha kwekupedzisira kwekudzora-kupindira.

Chii chinonzi Dielectric Constant yeFR4?

Iyo FR4 dielectric constant (Dk, kana relative permittivity εr) ndiyo nzira yekuyera kuti PCB's insulating laminate inopindura sei kumagetsi. Pakugadzira kwekutanga, mainjiniya vanowanzo shandisa Drk ≈ 4.0–4.5 , asi iyo haisiyo kukosha kwakavimbiswa kune ese FR4. FR4 inoreva mhuri yezvinhu zve epoxy zvakasimbiswa negirazi zvine masisitimu akasiyana e resin, magadzirirwo emachira, uye hunhu hwemagetsi.

FR4 Dk chaiyo inoenderana ne laminate yakatarwa, magadzirirwo egirazi, huwandu hwe resin, mashandisirwo ekushanda, uye nzira yekuyedza. Kufungidzira kumwe chete kwe "FR4 = 4.4" kune njodzi zvakanyanya kune marongero e controlled-impedance uye high-speed.

FR4 Dielectric Constant vs. Frequency: Ruzivo Rwechokwadi rweMugadziri

FR4 inoratidza kupararira kwe dielectric: DRK yayo inogona kuchinja nekufamba kwenguva. Mienzaniso inotevera yeIsola 370HR inhamba dzakaburitswa zvakanangana nekuvakwa—kwete kukosha kwese kwese kweFR4 PCB.

Kuvakwa kwepakati kwe370HRResin contentKumhanya kweDk @ 100 MHzDk @ 1 GHzDk @ 10 GHz
1×106; 0.051 mm pakati71%3.893.813.63
1×1080; 0.064 mm pakati58%4.114.043.88

Chitubu: Matafura eIsola 370HR ekuvaka anoenderana neDk/Df . Makoshero ndeezvivakwa zvakataurwa nemamiriro ekuyedza.

Tafura inoratidza zvinhu zviviri zvakakosha: mhuri imwe chete yezvinhu zveFR4 inogona kuva neDk values ​​dzakasiyana nekuti magadzirirwo ayo akasiyana, uye Dk yakayerwa pa1 GHz haifanirwe kushandiswa otomatiki pa10 GHz. Mukarukureta, frequency inoshandiswa kune wavelength yakatungamirirwa uye phase ; haigadzire Dk-versus-frequency curve.

Mashandiro anoita Calculator: Mafomura Echokwadi

Karukureta inobata nzira yechiratidzo senzira yakanaka, isina kurasikirwa, isina magineti. Inotanga yaona kuti inokwanisa sei kubvumidza uye yozoverenga kumhanya kwekupararira uye kunonoka:

v = c / √εeffDelay (ps) = Length (mm) × √εeff × 1000 / 299.792458Guided wavelength (mm) = v (mm/ns) / f (GHz)Electrical length (°) = 360 × Length / Wavelength

Pano, c = 299.792458 mm/ns . Iyo effective relative permittivity (εeff) inoenderana ne transmission-line cross-section:

Stripline: Trace Yakanyatsoiswa

Kuti uwane modhi ye stripline yakakwana , εeff = Dr. Izvi zvinoita kuti kuverenga kwekunonoka kuve nyore, asi hakuverenge stripline impedance. Real stripline impedance inoda zviyero zve trace, ukobvu hwemhangura, plane spacing, uye ruzivo rwe stackup.

Microstrip: Ruzivo rwepamusoro

Chishandiso che microstrip chine minda mumhepo nemuPCB substrate. Karukureta inoshandisa chiyero che quasi-static approximation che εeff zvichibva pahupamhi hwe trace W, urefu hwe dielectric h, uye bulk Dk. Mhedzisiro yacho yakaderera pane bulk Dk ye microstrip yakajairika inofumurwa nemhepo.

Pamuchina we microstrip chete, chishandiso ichi chinoratidzawo hunhu hwekutanga hwe impedance Z₀ uchishandisa zero-conductor-thickness closed-form approximation. Izvi hazvisanganisire solder mask, finite copper thickness, copper roughness, frequency dispersion, kana manufacturing tolerances; hachigone kutsiva board shop yako ye impedance field solver.

Muenzaniso Wakashanda: Dr 4.2 vs. 3.8

Kuti uwane tambo yekutumira ine 50 mm yakakodzera, DDK = 4.2 inoburitsa 341.80 ps yekunonoka kwenzira imwe chete, nepo DDK = 3.8 inoburitsa 325.12 ps . Uyu musiyano we16.68 ps pakureba kwakafanana. Chinja urefu hwemutsetse kana chinja kuenda kuMicrostrip mucalculator iri pamusoro kuti uone mhedzisiro inoenderana nejometri yako.

FR4 Dr vs. Df: Nei Zvese Zvichikosha

Dk inokanganisa kupararira kwemagetsi, kumhanya kwechikamu, uye kupindira kwemutsara wekutumira. Df (dissipation factor, kana loss tangent) inotsanangura kurasikirwa kwesimba re dielectric uye inobatsira pakuderedzwa kwechiratidzo. Chinhu chePCB chine Dk yakaderera hachingoerekana chava neDf yakaderera kana kurasikirwa kwese kwese kwekuisa. Kusarudzwa kwezvinhu zvinomhanya zvakanyanya uye RF kunofanirwa kufunga nezve zvese, pamwe chete nekurasikirwa kwemhangura, kuomarara, uye geometry yedunhu.

Maitiro aDk Anoita 50-Ohm uye 100-Ohm PCB Routing

Hunhu hweDielectric hunokanganisa hunhu hwe50 Ω single-end traces uye 90/100 Ω differential pairs, asi Dk chete haina kukwana kuverenga impedance . Kuverenga kwakavimbika kwecontrolled-impedance kunoda stackup geometry, reference-plane arrangement, finished copper thickness, line width, uye—mu differential pairs—trace spacing uye coupling.

Shandisa mhedzisiro ye microstrip Z₀ iri pamusoro apa kuti uongorore pfungwa dzako pakutanga chete. Pakugadzira kwekupedzisira, ipa Highleap Electronics zvinangwa zve controlled-impedance uye stackup yakarongwa kuitira kuti fungidziro dzakakodzera dze geometry uye zvinhu zvigone kuongororwa.

Zvekutumira Mugadziri wePCB

Kune FR4 PCB ine impedance inodzorwa kana zviratidzo zvinomhanya zvakanyanya, sanganisira giredhi re laminate (kana dzimwe nzira dzakatenderwa), layer stackup, ruzivo rwepakati/prepreg kana ruripo, zvinodiwa zvemhangura zvakapedzwa, mambure anodzorwa uye target impedances, tolerances, mafaira ekugadzira, uye chero zvipingamupinyi zvekurasikirwa kana nguva. Kune mapurojekiti akazara ePCB assembly, ipawo BOM, data rekuisa zvikamu, uye zvinodiwa zveassembly.

Highleap Electronics inopa mabasa ekugadzira maPCB uye ekubatanidza maPCB . Muunganidzwa unogadzirwa unofanira kufunga nezvekuwanikwa kwezvinhu, ukobvu hwe dielectric, kushivirira kwekugadzirwa, kudziyisa kwekugadzira, uye kuvimbika kwenguva refu—kwete nhamba yeDk chete.

FR4 Dielectric Constant: Mibvunzo Inowanzo bvunzwa

Chii chinonzi dielectric constant yeFR4?

Mazhinji eFR4 laminates anoshandiswa zvakanyanya ari pakati pe4.0–4.5, asi hapana kukosha kumwe chete. Shandisa zvakanyorwa zveDk pane frequency yakakodzera pakuverenga kwekupedzisira kwedhizaini.

Chii chinonzi FR4 dielectric constant pa1 GHz?

Zvinoenderana nekugadzirwa kwelaminate. Semuenzaniso, Isola 370HR 1×1080 core ine 58% resin ine 4.04 GHz yakabudiswa; zvimwe zvakagadzirwa zvakasiyana.

Chii chinonzi FR4 dielectric constant pa10 GHz?

Zvinoenderana nechigadzirwa uye magadzirirwo acho. Iyo Isola 370HR's 1×1080, 58% resin core inoburitswa paDk = 3.88 pa10 GHz. Usashandise kukosha uku kune imwe FR4 grade pasina kusimbiswa.

Ndingakwanisa here kuverenga 50-ohm trace width ndichishandisa Dr chete?

Kwete. Upamhi hwetrace hunodiwa hunoenderanawo nekukwirira kwe dielectric, ukobvu hwe conductor, trace geometry, uye zvimwe zvinhu zvakaunganidzwa. Mhedzisiro yedu ye microstrip impedance ndeyekutanga kwe zero-ukobvu approximation, kwete chiratidzo chekugadzirwa.

Sei kunonoka kwe stripline ne microstrip zvakasiyana?

Minda yemutsetse wakakomberedzwa zvakanaka iri mu substrate, saka εeff inenge yakaenzana nezvinhu Dk. Microstrip inobuda mumhepo inogovana minda yayo pakati pe substrate nemhepo, zvichipa εeff yakaderera uye kazhinji inokurumidza kupararira kwehuwandu hwakafanana Dk.

Kusarudza frequency yakakwira kunoderedza otomatiki Drk here?

Kwete nenzira yakavimbika uye yakajairika. Dk ine kupararira kwema frequency akasiyana-siyana. Chishandiso ichi hachimbochinji maDk input ako kana frequency ichichinja; unofanira kuisa kukosha kwakabudiswa nemutengesi kana modhi inotsigirwa nema frequency.

KUBVA PAKUVERENGA KUSVIKA PAKUGADZIRA

Unoda Controlled-Impedance FR4 PCB?

Tumira Highleap Electronics yako stackup, mafaira ekugadzira, impedance targets, uye zvinodiwa pakugadzira. Tinogona kukurukura zvaunoda kugadzira PCB nePCBA tichitarisa zvirambidzo zvekugadzira.

Bata Highleap Electronics →
Kufungidzira kwedzidzo. Karukureta inoshandisa maequations ekutumira-mutsara asina kurasikirwa uye, kune microstrip, quasi-static zero-thickness approximations. Haifanotaura frequency-dependent Dk, dielectric loss, differential impedance, kana finished-board production tolerance. Simbisa magadzirirwo ekukurumidza uye RF uchishandisa laminate documentation, full stackup, field solver yakakodzera, uye PCB manufacturing review.
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