Dhizaini yePCB yeSMA Connector: Kuisa uye Kutangisa kwe50-Ohm

Chinobatanidza cheSMA (SubMiniature version A) chinobatanidza cheRF che50-ohm coaxial chinoshandiswa zvakanyanya kuunza masaini eredhiyo paPCB, chinowanzo shandiswa kusvika pa18 GHz. Kuchiisa zvakanaka pabhodhi hakunyanyi kukosha pachinobatanidza asi zvakanyanya kukosha pakuburitswa, chimiro chetsoka chinotakura chiratidzo kubva pacoax kuenda pa50-ohm PCB trace isina kuratidzwa. Gwaro iri rinofukidza maSMA variants, mhando dzekuisa PCB, chimiro chekuburitswa chinoisa impedance, mashandisirwo etrace nezvinhu, uye kuti chinobatanidza chinounganidzwa sei.

Chii chinonzi SMA Connector?

SMA ndeimwe yeRF connectors dzinonyanya kushandiswa. Inoshandisa screw-thread coupling uye 50-ohm coaxial geometry, zvichiita kuti ive yakasimba uye inodzokororwa pakubatanidza tambo, maantenna, uye zviridzwa pabhodhi.

Hunhu hunokosha

• Impedance ye50-ohm, kufananidza masisitimu eRF akajairika uye tambo ye coaxial.
• Kubatanidza kwakabatana neshinda, ichipa kubatana kwakachengeteka, kunokwanisa kuzununguka.
• Frequency range kazhinji kusvika pa18 GHz, neshanduro dzakanyatsojeka dzichisvika pamusoro.

Nekuti inotakura RF, kubatana kweSMA kunongobatsira chete kana ukachinja kuita bhodhi. Izvi zvinoita kuti ive dambudziko rechiratidzo pamwe chete nedambudziko remakanika, zvine chekuita zvakanyanya nepfungwa huru dzekugadzira RF nekukurumidza.

Mhando dzeSMA Connector uye RP-SMA

Haasi ese ma "SMA" connectors anowirirana, saka kuziva musiyano chaiwo kunokosha.

RP-SMA ndiyo nzira inowanzo kanganisa vanhu. Yakatangwa nekuda kwezvikonzero zvemutemo pazvigadzirwa zvemagetsi zvisina waya, uye kunyangwe ichitaridzika seSMA, kubatana kwayo pakati nepakati kunoreva kuti haizobatane zvakanaka neSMA yakajairwa. Gara uchisimbisa standard uchienzaniswa nereverse-polarity, uye bonde, zvichienderana neantenna kana tambo yaunoda kushandisa usati watanga kushandisa footprint.

Sarudzo dzeSMA PCB dzekuisa

MaSMA connectors anobatanidzwa pabhodhi nenzira dzakasiyana-siyana, uye sarudzo yacho inokanganisa kutanga uye mashandiro acho.

• Kutangisa mupendero. Inoiswa pamucheto webhodhi nepini yepakati ichimhara pamusoro pechinhu; inofarirwa kuti ishandiswe zvakanaka uye ine impedance.
• Kuburikidza neburi rakamira/rinobuda nepaburi. Pini yepakati inopfuura nepakati pebhodhi ichipinda mu via kana pad; iri nyore uye yakasimba.
• Kuisa pamusoro. Zvinosungirirwa pamapedhi epamusoro, zvinogadzirisa kubatanidzwa kwemvura inoyerera uye mapurofayiri epasi.

Kuisa ma "edge-launch" kunowanzo shandiswa pama "frequency" akakwira nekuti chiratidzo chinogara pa "strip" yepamusoro pasina "through-board transition" iyo inogona kuwedzera kusagadzikana. Ma "through-hole" uye "panel-mount" akajairika apo simba remakanika kana "chassis" inobatanidza chinhu chinokosha. Maitiro ekuisa ma "mounting" anofanira kusarudzwa pamwe chete nedhizaini yekutanga, kwete mushure meizvozvo.

Edge-Launch vs Through-Hole vs Surface-Mount

Maitiro ekuisa anoumba shanduko yeRF uye kuti chinongedzo chinobata sei kushushikana kwemakanika.

Kuti pave nekuchinja kwakachena kwe-high-frequency, edge-launch inochengetedza chiratidzo pa microstrip yepamusoro pasina danho re through-board. Mafashoni e through-hole nepaneru anochinjana mashandiro eRF kuti pave nesimba remakanika kana kubatana ne chassis. Chero rudzi rwemagadzirirwo, tsoka inofanira kuenderana nechikamu chaicho uye stackup, ndosaka sarudzo yekumisikidza ichiitwa pamwe chete nekumisikidzwa panguva yekurongeka kwekumhanya kwakanyanya uye yakasimbiswa isati yaungana.

SMA Footprint uye Launch Geometry ye50 Ohms

"Kutanga" inzvimbo diki apo coaxial connector inosangana nePCB trace, uye ndipo panowanikwa mashandiro mazhinji eSMA. Chinangwa ndechekuchengetedza impedance iri pa50 ohms kuburikidza nekuchinja kuitira kuti chiratidzo chisaratidze.

Nzira yakavimbika yekuita izvi nemazvo ndeyekutevera gwara rinokurudzirwa nemugadziri wekubatanidza, iro rakagadzirirwa bhodhi rakati. Chiratidzo chemagetsi chakakura zvakanyanya chinowedzera capacitance uye chinodzikisa impedance; zvisipo zvepasi zvinosiya nzira yekudzoka isina kuenderera mberi. Kune zvikamu zvekuburitsa maedge-launch, kurongedza mapedhi zvakananga kumucheto webhodhi chikamu chekuburitsa. Aya ndiwo marongerwo akaitwa uye anowanikwa panguva yekugadzira PCB , uye kuaongorora ibasa guru rekuongorora dhizaini.

Kufananidza PCB Trace neZvinhu

Kuburitswa kwakanaka kunofanira kuendeswa kune 50-ohm trace yakagadzirwa zvakanaka, kana kuti bhenefiti yacho inorasika nemamirimita mashoma.

Mutsetse we50-ohm

Trace inowanzova microstrip kana kuti grounded coplanar waveguide ine upamhi hunoverengerwa kubva pa stackup, dielectric constant (Dk), dielectric thickness, uye copper. Connector launch inofanira kuenderana ne trace width iyi, saka launch ne line zvakagadzirwa pamwe chete senzira imwe ye 50-ohm.

Zvinhu zviri pamafrequencies akakwira

Pama frequency akakwira, laminate yakajairika inorasikirwa nechiratidzo chakawandisa. Chinhu chinorasikirwa zvishoma chine dhisiki yakaderera, yakagadzikana uye chinhu chinonyungudutsa zvishoma, pamwe nemhangura yakapfava, chinoderedza kurasikirwa kwekuisa. Apa ndipo panobatsira mabhodhi anorasikirwa zvishoma nezvinhu zvakatsaurirwa zve high-frequency , zvichiita kuti kuburitswa nekuratidzwa kwakagadzirwa zvakanaka kusadzoserwe ne substrate.

Kubatanidza uye Kuisa SMA Connector

Chinobatanidza cheSMA chakasungirirwa sezvimwe zvikamu, asi chine simba rekusangana rinodzokororwa, saka makanika acho anokosha.

• Kugadziriswa. Magadzirirwo ekuisa pamucheto uye ekusungira pamusoro pechiso anosungirirwa pachiratidzo nemapedhi epasi; magadzirirwo ekuisa paburi anoiswa mubhodhi.
• Mechanical simba. Nekuti kuskurura tambo kunoshandisa torque uye chinongedzo chinotora mitoro yemativi, majoini akasimba ekusonesa, uye dzimwe nguva kuisa ma tabo kana hardware, chengetedza yakachengeteka.
• Kusundana uye kurongeka. Kubata zvakanaka pasi uye kubatana kwakasimba zvinodzivirira kuburitswa kwemvura kuti isafambe nekufamba kwenguva.

Pamutsetse wekugadzira, maconnector aya anoiswa uye anosungirirwa sechikamu chePCB assembly, achitarisa maRF joints uye mechanical retention. Chinobatanidza chakanyatsogadzirwa nemagetsi asi chisina kusimba chichakundikana kushanda, saka zvinhu zviviri izvi zvakagadzirwa pamwe chete.

Zvikanganiso zveSMA PCB zvakagadzirwa nevanhu vakawanda

Matambudziko mazhinji eSMA anobva pane runyorwa rupfupi rwezvikanganiso zvinogona kudzivirirwa.

• Kushandisa nzira yakajairika yekutsika tsoka pachinzvimbo chemufananidzo wepasi wakagadzirwa nemugadziri wezvinhu zvako zvakaunganidzwa.
• Chikwangwani chikuru kwazvo, iyo inowedzera capacitance uye inodhonza impedance iri pasi pe50 ohms.
• Kushaikwa kana kusawanikwa kuburikidza nefenzi, kusiya kudzoka kwepasi kusingaenderere mberi pakutangwa.
• Trace haina kuenzaniswa ne50 ohms, kana upamhi husingasvike pakuburitswa kwacho zvakanaka.
• Zvinhu zvisirizvo pahuwandu hwakawanda, kurega substrate ichitonga kurasikirwa.
• Kuvhiringidza SMA neRP-SMA, zvichikonzera chinobatanidza chisingazobatana.

Chimwe nechimwe cheizvi chiri nyore kudzivirira panguva yekugadzira uye chinorwadza kugadzirisa mushure mezvo. Kutevera datasheet rekubatanidza, kufananidza trace nezvinhu, uye kusimbisa shanduko kunoshandura SMA kubva panjodzi kuita interface yeRF inodzokororwa, inodzokororwa.

Chinobatanidza cheSMA paPCB chinobudirira kana kukundikana pakuvhurwa: nhanho yakagadziriswa nemugadziri, 50-ohm trace inoenderana, pasi rakasimba kuburikidza nefenzi, uye zvinhu zvisingarasikirwe zvakanyanya pamafrequencies akakwira. Simbisa shanduko yacho, gadzira kuvhurwa kwayo wobatanidza, uye woibatanidza zvakasimba. Unogona kuverenga zvakawanda nezveHighleap Electronics uye kugona kwedu kweRF uye high-frequency.

Mibvunzo Inonyanya Kubvunzwa

Chii chinoshandiswa paPCB chinobatanidza SMA?

I 50-ohm coaxial connector ine tambo inoshandiswa kuunza masaini eRF pabhodhi nepakubuda, ichibatanidza netambo, ma antenna, uye michina yekuyedza. Inowanzo shandiswa kusvika pa18 GHz. PaPCB, chinhu chakakosha ndechekutanga, tsoka inoshandura chiratidzo kubva pa coax kuenda pa 50-ohm trace pasina kuratidzwa.

Ndeupi musiyano uripo pakati peSMA neRP-SMA?

RP-SMA (reverse-polarity SMA) ine mhando dzema "centre contacts" dzakachinjwa zvichienderana ne standard SMA. Yakatangwa nekuda kwezvikonzero zvemutemo pazvigadzirwa zve wireless zvevatengi. Kunyangwe ichitaridzika zvakafanana, haizobatane zvakanaka ne standard SMA, saka unofanirwa kufananidza mhando chaiyo uye mhando ye "sex" ne antenna kana cable yako.

Ndeipi mhando yekuisa SMA yandinofanira kushandisa?

Kuisa ma "edge-launch" kunodiwa kana paine ma "frequency" akakwira nekuti chiratidzo chinogara pa "strip" yepamusoro pasina kuchinja kwe "through-board". Mhando dze "vertical" kana "end-launch" dzakareruka uye dzakasimba, uye "surface-mount" inokodzera "reflow assembly". Sarudza maitiro ekuisa pamwe chete nedhizaini yekuisa ma "launch" uye zvinodiwa ne "mechanical" yebhodhi.

Sei geometry yekutanga ichikosha?

Kuburitswa ndipo panosangana necoaxial connector nePCB trace, uye chero danho re impedance ipapo rinoratidza simba reRF. Chiratidzo chehukuru hwakakodzera, pasi rakakomberedza, fenzi inoenda kumatanho ereferensi, uye nzvimbo dzakachena dzinochengetedza shanduko pa50 ohms. Kutevedzera zvinokurudzirwa nemugadziri wechinhu chako che stackup ndiyo nzira yakachengeteka.

SMA inofanira kubatana nezvinhu zvipi?

Chishandiso che50-ohm microstrip kana kuti grounded coplanar waveguide chine upamhi hunoverengerwa kubva pa stackup, dielectric constant, uye copper, chakafanana ne connector launch. Pama frequency akakwira, shandisa laminate ine low-loss, high-frequency ine low, stable Dk uye smooth copper kuderedza kurasikirwa kwe insertion, kana kuti substrate ichakanganisa launch yakanaka.

Ko chinobatanidza cheSMA chinochengetwa sei chakachengeteka nekanika?

Nekuti kubatana kwetambo kunoshandisa torque uye mativi emota, chinongedzo chinoda majoini akasimba ekusolder kune masignal neground pads, uye dzimwe nguva kuisa ma tabs kana hardware. Kubatana kwakanaka pasi uye kubatana kwakasimba kunoitawo kuti launch isachinje nekufamba kwenguva. Chinongedzo chakanyatsogadzirwa nemagetsi asi chisina kusimba chichakundikana kushanda.

Ndechipi chikanganiso chinowanzoitwa neSMA design?

Kushandisa nzira yekubata nhanho yakajairika panzvimbo penzira yemugadziri wekubatanidza yakagadzirwa, inowanzobatanidzwa nepadhi rechiratidzo rakakura uye fenzi isina kuburitswa. Izvi zvinogadzira kusagadzikana kweimpedance pakuvhurwa. Kutevera nzira yekubata nhanho yedatasheet, kufananidza nzira ye50-ohm, uye kusimbisa SMA neRP-SMA kunodzivirira matambudziko mazhinji.

Chinobatanidza SMA chinotsigira huwandu hupi hwema frequency?

MaSMA connectors akajairika anowanzo shandiswa kusvika pa18 GHz, uye mavhezheni chaiwo emhuri yehukuru hwakafanana anosvika pakakwirira. Muganho wepamusoro webhodhi unoshanda unoenderana zvakanyanya nedhizaini yekuburitsa, trace, uye zvinhu; kuburitsa kusina kunaka kana laminate inorasikirwa inoderedza mashandiro ayo pasi pechiyero checonnector.

Ndingagona here kusanganisa SMA nemaoko?

Ehe, zvinobatanidza zveSMA zvinosungirirwa pamucheto uye zvinopinda nepaburi zvinowanzo sungirirwa nemaoko, zvichitarisa kuti pave nejoin rakachena papini yepakati uye panobatana pasi. Mhando dzezvokusungirirwa pamusoro dzinogona kudzoserwa mvura kana kusungirirwa nemaoko. Chinodiwa chikuru ndechekushandisa michina: majoin anofanira kutsungirira torque uye mutoro wepadivi wekubatanidza tambo.

Zvinhu zvePCB zvinokanganisa here kubatana kweSMA?

Zvinokosha pahuwandu hwemafrequencies akakwira. Trace impedance inoverengerwa kubva pa dielectric constant uye ukobvu hwe laminate, uye kurasikirwa kwechiratidzo kunoenderana ne dissipation factor uye copper roughness. Zvinhu zvinorasikirwa zvishoma uye high-frequency zvinochengetedza kurasikirwa kwekuisa pasi, saka substrate chikamu cheRF design, kwete kungotakura michina chete.