Icacisiwe iMigangatho yoMgangatho wePCB eQhelekileyo | Ulwazi loMveliso lweRF PCB
Intshayelelo
Kwishishini le-elektroniki elitshintsha ngokukhawuleza namhlanje, ii-PCB ezisebenzisa i-frequency ephezulu zibaluleke kakhulu kwizicelo ezifana nonxibelelwano lwe-5G, ukuhamba ngesathelayithi, iinkqubo ze-radar, kunye ne-elektroniki yabathengi abakumgangatho ophezulu. Ukusebenza kwezi nkqubo kuxhomekeke kakhulu kumgangatho we-PCB, okwenza ukunamathela kwimigangatho yomgangatho ongqongqo kubaluleke kakhulu. Njengoko ulindelo lokusebenza kwezixhobo ze-elektroniki lunyuka, kunjalo nemigangatho ye-RF kunye nee-PCB ezisebenzisa i-frequency ephezulu. Kwiinjineli zoyilo lwe-PCB, ukuqonda nokufezekisa ezi milinganiselo kubalulekile ekuphuhliseni iimveliso ze-elektroniki ezithembekileyo nezisebenza kakuhle.
Imigangatho yoMgangatho oPhambili wee-PCB eziQhelekileyo
1. Imigangatho Yokusebenza Kombane
Ulawulo lwe-Impedance oluyimpawu
Iisekethe ezisebenzisa umbane ophezulu zifuna ulawulo oluchanekileyo lwe-impedance yeempawu, ngesiqhelo ngaphakathi kwe-±5% yethagethi yoyilo. Umzekelo, ii-PCB zesiseko se-5G zihlala zifuna i-impedance ye-50Ω okanye i-75Ω. Ukuphambuka kunokukhokelela ekubonakalisweni kwesignali, ukwehla kokuthembeka kwesignali, ukunciphisa isantya sokudluliselwa kwedatha, kunye nokwanda kwamazinga empazamo ye-bit. Ukuze kugcinwe ukuchaneka kwe-impedance, abayili kufuneka bachaze ngononophelo ububanzi be-trace, isithuba se-trace, ubukhulu be-dielectric, kunye nezixhobo ezikhethiweyo ezine-dielectric constants ezizinzileyo (Dk).
Ukulahleka koThumelo lweSignali
Ukulahleka kwesignali akunakuphepheka kwitransmission ye-high-frequency kwaye kubandakanya ukulahleka kwe-conductor kunye ne-dielectric. Kwii-frequency ze-millimeter-wave (umz., 24GHz–52GHz), ukulahleka kwesignali kufuneka kuncitshiswe—ngokuqhelekileyo kugcinwe ngaphakathi kwe-0.5dB ukuya kwi-1dB nge-intshi. Ukusebenzisa izixhobo ze-low dissipation factor (Df) ezifana IRogers RO4350B（, kunye nokulungiswa kwe-PCB stackups kunye noyilo lwe-trace, kunokunciphisa kakhulu ukuncitshiswa kwesignali.
Ukucinezelwa kweCrosstalk
Ukuphazamiseka kwe-trace okukufutshane, okanye i-crosstalk, kunokuphazamisa ukuthembeka kwesignali ye-high-frequency. Imilinganiselo efana ne-NEXT (Near-End Crosstalk) kunye ne-FEXT (Far-End Crosstalk) isetyenziselwa ukuvavanya ukuphazamiseka. Imigangatho yoshishino ifuna i-NEXT engaphantsi kwe-30dB kunye ne-FEXT engaphantsi kwe-40dB. Ukunciphisa okusebenzayo kubandakanya ukwandisa isithuba se-trace, ukusebenzisa iiplani zomhlaba okanye ukukhusela, kunye nokwenza ngcono i-topology ye-routing.
2. Imigangatho yoLwakhiwo loBume
Ukuchaneka koBume
Ukuze kuhlanganiswe inkqubo engenamthungo, ii-PCB ezisebenza rhoqo zifuna ukunyamezelana okuqinileyo. Ubukhulu bebhodi kufuneka bulawulwe ngaphakathi kwe-±0.05mm, kunye nobubanzi bemingxuma ngaphakathi kwe-±0.02mm. Ukulungiswa ngokuchanekileyo kunye nolawulo oluqinileyo lwenkqubo kubalulekile ukuze kuhlangatyezwane nale migangatho—ukungaphumeleli kunokubangela iingxaki zokuhlanganisa kunye nokwehla kokusebenza.
Ibhodi ethe tyaba
Ukuthambatha kuchaphazela ngokuthe ngqo umgangatho wokunyibilikisa kunye nokuzinza kwesignali. Imigangatho yeshishini idla ngokuthintela ukugoba kwebhodi ukuba kungaphantsi kwe-0.5%. Iinkqubo zokulahla inkunkuma ezilawulwayo (ubushushu, uxinzelelo, izinga lokupholisa) kunye nee-layer stacks eziyilwe kakuhle zinceda ukugcina ukuthambatha. Ukuthambatha okubi kunokukhokelela kwiziphene ze-solder kunye notshintsho lwe-impedance oluphawuleka ngenxa yokuguquguquka kwe-trace.
3. Imigangatho yokuthembeka
Ukumelana nokusingqongileyo
Ii-PCB ezisebenza rhoqo kufuneka zimelane nobushushu, ukufuma, kunye neendawo ezirhabaxa. Umzekelo, phantsi kweemeko ze-85°C/85% RH kangangeeyure ezili-1000, ukusebenza kombane kunye nolwakhiwo kufuneka kuhlale kuzinzile. Amanyathelo okukhusela afana nemaski yesolder ekumgangatho ophezulu, ukugqitywa komphezulu we-ENIG, kunye neengubo zokufuma/izithintelo zinceda ukuphucula ukuqina kokusingqongileyo.
Ukuthembeka kweSolder Joint
Izihlanganisi ze-solder zenza unxibelelwano olubalulekileyo phakathi kwezinto kunye ne-PCB. Kufuneka zinyamezele uxinzelelo loomatshini kunye nokujikeleza kobushushu (umz., -40°C ukuya kwi-125°C, imijikelo eli-1000) ngaphandle kokuqhekeka okanye ukuqhekeka. Ukuqinisekisa ukunyibilika, iiprofayili zobushushu ezifanelekileyo, kunye nokuqina komgangatho womphezulu kubalulekile kumalungu aqinileyo.
Uhlalutyo olugqibeleleyo lweziphene: Izizathu, iimpawu, kunye neziphene zokusebenza
1. Ukusilela kokusebenza kombane
Iimpawu: Ukudluliselwa kwesignali okungazinzanga, ukuncitshiswa kwesignali ngokugqithisileyo, ukubonakaliswa okuqatha, okanye incoko engaqhelekanga. Izixhobo zovavanyo zinokubonisa ii-waveforms ezigqwethekileyo, ukwehla kwe-amplitude, okanye ingxolo eyonyukileyo.
Izizathu: Uyilo lwe-impedance olungachanekanga, ubude okanye uxinano olugqithisileyo, izixhobo ezingafanelekanga (umz., i-Dk engazinzile okanye i-Df ephezulu), ulawulo olubi lokugrumba, okanye ubukhulu be-dielectric obungalinganiyo.
Umsantsa Wokusebenza: Iibhodi ezithobela imigangatho zixhasa ukuhanjiswa kwedatha okuzinzileyo ngesantya esiphezulu. Iibhodi ezineengxaki zinokubangela ukuphazamiseka konxibelelwano kunye nemiba yokugubungela, ingakumbi kwizikhululo ze-5G.
2. Iziphene zoKwakha
Iimpawu: Ukungalingani ngexesha lokuhlanganiswa, ukugoba kwebhodi, ubungakanani bemingxunya elahlekileyo okanye engaguqukiyo. Izixhobo ezibonakalayo okanye zokulinganisa (umz., ii-calipers, umlinganiselo we-2D optical) zinokubona ezi ziphene.
Izizathu: Ukuchaneka kwezixhobo, ukugcinwa okunganelanga, uxinzelelo olungalinganiyo lwe-lamination, ukupholisa ngokukhawuleza, okanye ii-drill bits ezibuthuntu.
Isithuba Sokusebenza: Ii-PCB ezisemgangathweni ngokwesakhiwo ziqinisekisa ukulingana kwendibano eqinileyo kunye noqhagamshelo lombane oluthembekileyo, ngelixa iibhodi ezineengxaki zonyusa umngcipheko woxinzelelo loomatshini, ukuqhekeka kwamalungu, kunye nokuqhekeka kwendlela yesignali.
3. Imiba yokuthembeka
Iimpawu: Ukuqhekeka kwamalungu e-solder, ukugqwala, ukususwa kwe-denamination, okanye ukungasebenzi kakuhle kwe-insulation. Ukuhlolwa kwe-microscopic kunye novavanyo lokumelana ne-insulation lubonisa ezo mpazamo.
Izizathu: Ukunamathelana okungalunganga komphezulu, iiprofayili zokutywina ezingafanelekanga, okanye ukuvezwa kwiindawo ezinobushushu obuphezulu, umswakama ophezulu, okanye iikhemikhali ngexesha lokugcina okanye ukusebenza.
Umsantsa Wokusebenza: Ii-PCB ezinokuthembeka okuphezulu zisebenza ngokuzinzileyo kwiindawo ezinzima, zibalulekile kwi-aerospace nakwi-elektroniki yezonyango. Iibhodi ezinokuthembeka okuphantsi zonyusa ixesha lokungasebenzi, iindleko zokugcinwa, kwaye zinokubangela iingozi ezinkulu zokusebenza.
Uvuyo Olupheleleyo Olutyebileyo: Iqabane Lakho Elithembekileyo Le-PCB Elihlala Liphindaphindeka Kakhulu
Ngamava eminyaka emininzi kwi-RF kunye nokuveliswa kwe-PCB rhoqo, iRich Full Joy iphuhlise ubuchule obunzulu bobuchwephesha. Sihambelana ngobuchule nemigangatho yomgangatho oqinileyo ngezixhobo zemveliso eziphambili, iinkqubo zomgangatho oqinileyo, kunye nolwazi olusebenzayo kushishino. Iimveliso zethu zenzelwe ukuhlangabezana neemfuno ezibaluleke kakhulu kwi-5G, i-aerospace, i-satellite, i-radar, nakwezinye iindawo.
Simema bonke oonjineli boyilo be-PCB ukuba basilandele ukuze bafumane ulwazi oluqhubekayo malunga nobuchwepheshe be-PCB obuphambili obutyhala imida yokuvelisa izinto ezintsha kunye nokuthembeka.
