Yakakurumbira High-Frequency PCB Zvishandiso Sarudzo

Kusarudzwa kwezvinhu zvePCB zvine frequency yepamusoro kunotanga nekugadzikana kwe dielectric nguva dzose, kurasikirwa, copper profile, uye kurongeka kwekugadzira kunodiwa kuchengetedza impedance mumabhodhi eRF. Ndosaka sarudzo ye laminate ichikosha kupfuura mazita emhando yebhodhi kana dhizaini yapinda mu microwave, radar, kana high-speed RF territory. Gwaro iri rinoenzanisa zvinhu zvinoshandiswa mumaPCB ane frequency yakakwirira, rinotsanangura kuti FR-4 inomira kushanda zvakanaka kupi, uye rinoongorora mitemo yekugadzira inoshandiswa neHighleap Electronics kuchengetedza kusimba kwechiratidzo muRF builds. Kunzwisisa musiyano weRF zvinhu pakati peRO4003C neFR-4 kunobatsira kuona kana dhizaini ichida bhajeti rekurasikirwa rakasiyana, impedance model kana kugadzira stackup.

1. Chii chinoita kuti PCB ive nefrequency yakakwira?

PCB inonzi "high frequency" kana inotakura masaini nekukurumidza zvakakwana - kazhinji mu gigahertz range - zvekuti maitiro emagetsi ebhodhi uye trace geometry zvinotanga kudzora kana chiratidzo chichipona. Pama frequency iwayo, dielectric constant uye kurasikirwa kwelaminate, uye kurongeka kwezviyero zvetrace, zvinokosha se schematic, nekuti trace dzemhangura dzinoita semitsetse yekutumira kwete waya dzakareruka.

Zvinhu zviviri zvinotsanangura zvinodiwa: kurasikirwa kwechiratidzo kwakaderera, kuitira kuti chiratidzo chisanyangarika pakufamba kwacho, uye kugara kwakasimba kwe dielectric, saka impedance inoramba ichifungidzirwa. Kana chimwe chezvipi zvacho chisina kunaka, mhedzisiro yacho i attenuation, reflections, uye distortion zvinokanganisa link. Ndokusaka bhodhi re circuit rema frequency rakavakwa rakatenderedza laminate uye kugadzira kwakanyatsogadzirwa kutanga, uye nei mabhodhi aya ari kugona kwakasarudzika kwete kurongeka kwakajairika.

2. Zvinhu zvePCB zvine frequency yakakwira: PTFE, yakazadzwa neceramic, uye Drk

MaPCB ane mafrequency akakwirira anoshandisa ma laminates akasarudzika — akavakirwa paPTFE uye azere ne ceramic-filled hydrocarbon materials — akasarudzwa kuti aite dielectric constant yakaderera, yakagadzikana (Dk) uye kurasikirwa kushoma, pane standard FR-4. Chinhu chacho ndicho chinonyanya kukosha pabhodhi, uye chinosarudzwa nemagetsi aro pafrequency yekushanda:

Chinhu chakanaka ndechekuti zvinhu izvi zvinodhura zvakanyanya uye zvinogadziriswa zvakasiyana neFR-4, uye zvimwe zvinosanganiswa neFR-4 muma hybrid stackups kuti zvienzanise mutengo nekushanda. Hwaro hwemagetsi ndiyo dielectric constant uye loss tangent , uye pama frequency akakwira zvikuru kunyange copper foil surface finish inokanganisa kurasikirwa. Chero laminate yaunosarudza, gadzira zvinoenderana ne datasheet yayo yazvino pa frequency yako yekushanda. Mamiriro ese esarudzo akafukidzwa mugwaro rino rezvinhu zvine frequency yakakwira.

3. Nei FR-4 ichikundikana pahuwandu hwakawanda

FR-4 inokundikana pahuwandu hwepamusoro nekuda kwezvikonzero zviviri: iyo dielectric constant inodzorwa zvisina kurongeka uye inodonha nehuwandu, zvichiita kuti impedance isafanotaurwa, uye kurasikirwa kwayo kunokwira zvakanyanya sezvo huwandu hunowedzera, saka masaini anosvika asina simba uye akakanganisika. Pakumhanya kwakaderera kushaya simba uku hakuna basa, ndosaka FR-4 yakanaka kune akawanda mabhodhi - asi mu gigahertz range anova asingakodzeri.

Kusafanotaura Drk zvinoreva kuti chinhu chakagadzirirwa chinangwa chinogona kusarova, zvichikonzera kupenya; kurasikirwa kukuru kunoreva kuti simba rechiratidzo rinotorwa ne laminate risati rasvika kwarinoenda. Pamwe chete zvinokanganisa RF uye zvinongedzo zvekumhanya zvakanyanya kusvika pakukundikana. Iri ndiro gap rinozadzwa ne laminates dzakagadzirwa, uye kuziva nekukurumidza kunodzivisa kugadzira chigadzirwa chine frequency yakakwira pane chinhu chisingakwanise kuchitsigira - chimwe chezvinhu zvinoratidzwa mukutarisa uku kwezvikanganiso zvePCB zvine frequency yakakwira.

4. Mashandisirwo ePCB ane frequency yakakwira: 5G, radar, uye aerospace

MaPCB ane mafrequency akakwirira anoshandiswa mu5G uye muzvivakwa zvisina waya, radar yemotokari, masisitimu ekudzivirira ndege nendege, kutaurirana kwesatellite, uye ma data links anomhanyisa — chero kupi masaini anoshanda paRF/microwave frequency kana data rates yakakwira kwazvo. Chinodiwa chinowanzoitwa ndechekuti chiratidzo chinofanirwa kufamba nekurasikirwa kushoma uye impedance chaiyo, iyo inopihwa nemabhodhi aya chete:

• 5G uye isina waya. Nzvimbo dzepasi, maantenna, uye RF front ends zvinoshanda pama frequency akakwira uko kurasikirwa kwakaderera kwakakosha, chinhu chikuru chiri shure kwe 5G PCB.
• Radar yemotokari. Radar yekubatsira mutyairi uye yekudzivirira kurovera inomhanya pama frequency ema millimeter-wave ichida zvinhu zvakagadzikana uye zvisingarasikirwe zvakanyanya.
• Ndege nedziviriro. Radar, kutaurirana, uye masisitimu emagetsi zvinoda mashandiro eRF akavimbika mumamiriro ezvinhu akaoma.
• Dhijitari inomhanya zvikuru. Zvinongedzo zvedata nekukurumidza uye ma backplanes zvinoda kudzorwa kwe impedance uye kurasikirwa kushoma kuchengetedza kuvimbika kwechiratidzo.

Chinobatanidza izvi ndechekuti mutengo webhodhi rakasarudzika unoruramiswa nebasa risingagone kuwanikwa pazvinhu zvakajairwa - mashandiro echiratidzo ndicho chigadzirwa.

5. Mitemo yekugadzirwa kwePCB ine frequency yakakwira inokosha

Mitemo yakakosha yekugadzira ine frequency yakakwira ndeyekudzora impedance kuburikidza ne stackup, kugadzirisa stackup isati yatanga trace geometry, kugadzirisa nzira dzekudzoka uye mareferensi, uye kuverenga kurasikirwa mubhajeti. PaRF, kurongeka kwehurongwa iinjiniya yemagetsi, kwete kungobatanidza chete, saka mitemo iyi ndiyo inosarudza kana bhodhi richishanda:

• Kudzora kupindirana kuburikidza ne stackup. Upamhi hwetrace, ukobvu hwe dielectric, uye Dk pamwe chete zvinoisa impedance, saka stackup inofanira kutanga yasarudzwa uye chivakwa chinofanira kuibata — musimboti we controlled impedance.
• Dzivirira nzira dzekudzoka. Masaini anokasira anoda kuti pasi pawo pave nereferensi inoramba ichienderera mberi; mukaha uri munzira yekudzoka unokonzera kupenya uye mwaranzi.
• Bhajeti yekurasikirwa. Funga nezvekurasikirwa kwe dielectric ne conductor muhurefu hwe trace, uye sarudza copper yakapfava uko kurasikirwa kwakakosha.
• Batana nemugadziri. Nekuti mhedzisiro inoenderana nekuti chinhu chakanaka chinosvika papi chaizvo, maficha anodzorwa ne impedance anofanira kubvumirana usati wagadzira.

Mitemo iyi inoshanda chete kana bhodhi rakagadzirwa nemazvo, ndosaka dhizaini yemafirimu ane mafrequency akawanda uye kugadzirwa kwemafirimu ane mafrequency akawanda zvichifanira kurongwa pamwe chete pane kungoendeswa kusingafungi.

6. Magadzirirwo anoitwa maPCB eHighleap ane mafrequency akawanda

Highleap inogadzira maPCB ane ma "high-frequency" ane controlled-impedance processing, ma "laminates" nema "finishes" akakodzera RF, uye ma "hybrid stackups" apo mutengo nekushanda zvinoda kuenzana. Laminate inoenderana ne "operating frequency" yako uye "impedance targets", hupamhi hwemitsara ne "dielectric thicknesses" zvinobatwa zvakasimba kuti zvipe "impedance", uye "surface finish" inosarudzwa kuchengetedza RF performance uye solderability.

Nekuti mashandiro mazhinji ekupedzisira anogadziriswa panguva yekugadzira, ongororo yekugadzira isati yagadzirwa inosimbisa kuti stackup, upamhi hwemitsara, uye dhizaini zvinovakwa uye zvinoenderana nezvinangwa zvako zve impedance - nzvimbo iyo mabhodhi mazhinji eRF anobudirira kana kuunza matambudziko. Highleap inoita izvi kuburikidza nekugadzira PCB ine frequency yakakwira uye inotsigira kuunganidzwa kwebhodhi rine vanhu. Paunenge uchikumbira mutengo, taura laminate (kana kuti Drk/Df yako uye frequency), target impedance yako, stackup, uye kana kuvaka kwehybrid kuchigamuchirwa, kuitira kuti bhodhi rive rakatorwa uye rakavakwa nemazvo; kutarisa madhiraivha emitengo yePCB ane frequency yakakwira kunobatsira kuisa zvinotarisirwa.

7. Mibvunzo Inowanzo bvunzwa pamusoro pePCB

PCB inoonekwa seyakanyanya kukwira panguva ipi?

Hapana mutsetse wakaomarara, asi mabhodhi anowanzoonekwa seanowanzo shandiswa kana masaini asvika mu gigahertz range, kana kana data rakawanda richiita kuti kurasikirwa nemaitiro eimpedance zvive zvinogumira. Panguva iyoyo, ma laminates akasarudzika uye impedance inodzorwa zvinova zvinodiwa.

Ndinogona here kusanganisa zvinhu zvine frequency yakakwira neFR-4 mubhodhi rimwe chete?

Ehe — ma hybrid stackups anoisa laminate ine mafrequency akawanda chete pane maRF signals uye anoshandisa FR-4 kumwewo kuderedza mutengo. Kana ichikodzera dhizaini yako zvinoenderana nehurongwa hwayo uye inofanira kusimbiswa nemugadziri wako.

Sei maPCB ane mafrequency akawanda achidhura zvakanyanya?

Ma laminate akasarudzika anodhura kupfuura FR-4, anogadziriswa uye anoboorwa zvakasiyana, uye kuchengetedza kushivirira kwakasimba kwe impedance kunoda kudzora nekuyedza zvakanyanya. Ma stackup ehybrid inzira imwe yekugadzirisa mutengo.

Chii chinonzi kurasikirwa kwekupinza muPCB ine frequency yakakwira?

Kurasikirwa kwekuisa chiratidzo simba rinorasika parinofamba nechinhu chinodonhedza chiedza, kubva kusimba rinonwisa magetsi kubva mumagetsi uye simba remuchina wekufambisa magetsi. Malaminate asina kurasikirwa zvakanyanya uye mhangura yakapfava zvinoderedza simba iri, izvo zvakakosha pamatanho eRF akareba.

Ko kukora kwemhangura kunokanganisa mashandiro eRF here?

Ehe — kana paine mapombi akawanda, mapombi anoungana pamusoro pemhangura nedielectric, saka nzvimbo yakaoma inomanikidza nzira yakareba uye inowedzera kurasikirwa neconductor. Mafoil emhangura asina kunyatsojeka uye akapfava anoshandiswa kuderedza kurasikirwa uku mumagadzirirwo akaomarara.

Mabhodhi ane mafrequency akakwirira anoda kuongororwa kwakakosha here?

Kazhinji vanoita izvozvo — mabhodhi anodzorwa-anopindira anosimbiswa nekuyedzwa kwe-impedance (kazhinji kuburikidza nema-test coupons), uye mashandiro eRF anogona kuongororwa zvichienderana nezvinangwa zvekugadzira. Izvi zvinoratidza kuti bhodhi rakagadzirwa rinosangana nezvinodiwa zvemagetsi.