Hauv kev sib txuas lus niaj hnub no tau yooj yim, 5G, thiab cov kev siv radar, qhov nyuaj ntawm RF Circuit Coad yog nce hnub dhau ib hnub. Txawm li cas los xij, kev pom zoo ntawm kev ua haujlwm tau ncaj qha rau cov khoom siv tsis txaus, cov nyiaj txuas ntxiv luv luv, thiab muaj kev sib txuas lus luv nqi, thiab muaj cov kev sib txuas lus luv luv, thiab muaj cov kev sib txuas lus luv luv. Xaiv ib cov khoom siv Substrate uas tsim nyog yog qhov pib pib los daws cov teeb meem no, thiabPtfeSheet (Polytetrafluoroethylene) yog qhov tsis ntseeg ib qho ntawm cov neeg sawv cev tshaj plaws.
1, lub hauv paus ua rau pcb poob: tsis yog neeg saib xyuas uas ploj lawm
Feem ntau, peb faib PCB poob rau hauv ob qho tseem ceeb:
Cov neeg ua yeeb yam poob: Lub thermal poob tshwm sim los ntawm lub zog ntawm tus neeg xyuas pib (tshwj xeeb yog cov tawv nqaij tawv me me) thaum tam sim no ntws hauv lub xaim. Qhov saum npoo roughness ntawm tooj liab ntawv ci yog qhov tseem ceeb cuam tshuam rau cov neeg ua haujlwm poob. Ib qho chaw muag tooj liab nce ntxiv ua tau ntev ntawm txoj kev tam sim no, yog li ua kom poob.
Dielectric poob: qhov no yog qhov tseem ceeb ntawm kev poob hauvhigh - zausCov ntawv thov. Nws yog lub zog tsim tawm thiab tau noj los ntawm kev sib deev thiab kev sib txhuam ntawm cov lwg me me hauv dielectric cov ntaub ntawv hauv qab kev sib txuas ntawm ib qho hluav taws xob teb. Nws qhov loj yog txiav txim los ntawm tus yuam sij ntsuas ntawm qhov ploj tau tangent (DF lossis TANGE Δ). Qhov siab dua DF tus nqi, ntau dua dielectric ploj.
Rau qhov zoo liFr-4Cov ntaub ntawv, lawv tus nqi DF feem ntau nyob ib ncig ntawm 0.02, uas tuaj yeem ua rau tsis tsim nyog poob hauv zaus band hauv cov pob zeb saum toj. Yuav kom ua tiav kev ua tau zoo hauv RF Circuit Court hauv RF Circuit Cours, cov ntaub ntawv tshwj xeeb nrog DF tseem ceeb heev yuav tsum tau xaiv.
2, Vim li cas PTFE Board Qhov kev xaiv zoo tshaj plaws rau cov ntawv thov RF?
PTFE Board tau dhau los ua lub pob zeb pt worders tau dhau los ntawm high -}}}} Performance RF Circuit Design vim nws qhov kev ua tau zoo RF vim nws qhov kev ua tau zoo.
Tsawg kawg dielectric poob (DF): DF tus nqi ntawm cov khoom siv ntshiab PTFE yog tsawg heev (tuaj yeem qis li 0.0009), farior rau FR-4. Qhov no txhais tau tias lub zog ua kom muaj zog tsim los ntawm qhov nruab nrab ntawm lub teeb liab yog qhov tsawg heev, thiab lub teeb liab muaj peev xwm ua tau zoo siab.
Ruaj Ntseg Dielectric Constant (DK): Tus nqi DK ntawm PTFE ntawv pauv me me tsawg nrog zaus thiab muaj peev xwm ua kom muaj kev sib txawv ntawm cov khoom sib txawv ntawm cov khoom sib txawv. Qhov no yog qhov tseem ceeb rau kev ua tiav kev tswj hwm kev tswj hwm, tsis txhob muaj teeb liab xav txog thiab cuam tshuam los ntawm DK kev hloov pauv.
Cov khoom siv ua kom zoo heev bermal ruaj: PTFE cov khoom muaj ib tug heev coefficient ntawm thermal nthuav dav, uas tuaj yeem tswj cov hluav taws xob ntau ntau, ua kom muaj kev ntseeg tau ntawm cov khoom lag luam hauv ntau qhov chaw.
Cov ntawv txheeb xyuas kev lag luam PTFE suav nrog Rogers Lawb
3, Cov ntsiab lus tswv yim rau kev xaiv thiab ua cov phiaj PTFE
Txawm hais tias PTFE nplooj ntawv muaj kev ua tau zoo heev, lawv cov khoom siv lub cev thiab tshuaj lom neeg tsis zoo tseem pose cov kev cov nyom. Kev tsis pom zoo cov ntsiab lus tseem ceeb no tseem tuaj yeem ua rau muaj cov pcb tsis zoo lossis cov khoom tsis ua haujlwm.
Drilling thiab qhov ntsuas ntawm cov khoom lag luam: PTFE cov khoom siv tsis tau mos thiab nquag mus "drilling fouling" thaum drilling. Kev ua kom zoo drilling drilling thiab milling tsis thiab nruj cov txheej txheem desormar kom ntseeg tau tias muaj teeb meem zoo me me, thiab zam kev txhim kho teeb meem zoo.
Tooj liab ntawv ci: tus dufe ptfe nto tsis yooj yim rau txoj kev sib khi nrog tooj liab ntawv ci. High Xaus PTFE los xij Siv tshwj xeeb cov txheej txheem kev kho mob tshwj xeeb (xws li tshuaj lom etching) kom nce tooj liab ntawv ntawv ci. Thaum lub sijhawm tsim, nws raug nquahu kom tsis txhob siv cov chaw loj tooj liab ntawm cov chaw ib puag ncig nrog kev ua kom tiv thaiv loj.
Kev cuam tshuam tswj qhov tseeb: Nws yog qhov meej meej vim tias cov DK ruaj khov rau PTFE tias cov qib siab uas yuav tau muab tso rau ntawm kev siv cov khoom siv. Lub Hoobkas Hoobkas yuav tsum tswj hwm txoj kab dav, kab kev sib nraus, thiab dielectric txheej tuab. Ib qho kev sib txawv yuav cuam tshuam rau tus nqi impedance kawg, yog li qhia cov teeb liab rov qab poob.
Kev nqus dej noo: Qee cov PTFE sib xyaw muaj qee qib ntawm kev nqus dej noo. Pcb yuav tsum ci ua ntej sib dhos kom tiv thaiv kev kho mob lossis "board tawg" tshwm sim los ntawm ya raws li kev xav tawm ntawm kev npau taws rau cov kub.