Ukwazi kwe Imvamisa ephezulu Ibhodi Lezifunda Eziphrintiwe

Ku-PCB ekhethekile enefrikhwensi ye-electromagnetic ephezulu, ngokujwayelekile, imvamisa ephezulu ingachazwa njengefrikhwensi engaphezu kuka-1GHz. Ukusebenza kwayo ngokomzimba, ukunemba kanye nemingcele yezobuchwepheshe kuphezulu kakhulu, futhi kuvame ukusetshenziswa ezinhlelweni zokulwa nokushayisana kwezimoto, izinhlelo zesathelayithi, izinhlelo zomsakazo neminye imikhakha. Intengo iphezulu, imvamisa icishe ibe ngu-1.8 yuan ngesentimitha-skwele, cishe ama-yuan ayi-18000 ngemitha yesikwele.
Izici ze-HF ibhodi lesifunda sebhodi
1. Izidingo zokulawula i-impedance ziqinile, futhi ukulawulwa kobubanzi bomugqa kuqinile kakhulu. Ukubekezelelana okuvamile cishe ku-2%.
2. Ngenxa yepuleti elikhethekile, ukunamathela kwe-PTH yethusi yokufaka ithusi akuphakeme. Ngokuvamile kudingekile ukwenza i-vias nezindawo ezingaphezulu ngosizo lwemishini yokwelapha ye-plasma ukwandisa ukunamathela kwe-PTH yethusi kanye ne-solder resist inki.
3. Ngaphambi kwe-welding yokumelana, ipuleti alikwazi ukushaywa phansi, ngaphandle kwalokho ukunamathela kuzoba mpofu kakhulu, futhi kungenziwa kuphela roughened nge-micro etching liquid.
4. Iningi lamapuleti enziwe ngezinto ze-polytetrafluoroethylene. Kuyoba khona imiphetho eminingi emagebhugebhu lapho kwakhiwa ngezisiki ezivamile zokugaya, ngakho-ke kudingeka abasiki abakhethekile bokugaya.
5. Ibhodi lesekethe yefrikhwensi ephezulu ibhodi lesifunda elikhethekile elinemvamisa ephezulu ye-electromagnetic. Ngokuvamile, imvamisa ephezulu ingachazwa njengefrikhwensi engaphezu kwe-1GHz.

Ukusebenza kwayo ngokomzimba, ukunemba kanye nemingcele yezobuchwepheshe kuphezulu kakhulu, futhi kuvame ukusetshenziswa ezinhlelweni zokulwa nokushayisana kwezimoto, izinhlelo zesathelayithi, izinhlelo zomsakazo neminye imikhakha.

Ukuhlaziywa okuningiliziwe kwamapharamitha ebhodi le-High-Frequency Board
Imvamisa ephezulu yemishini ye-elekthronikhi iwumkhuba wokuthuthuka, ikakhulukazi ngokuthuthuka okukhulayo kwamanethiwekhi angenawaya kanye nokuxhumana ngesathelayithi, imikhiqizo yolwazi iqhubekela esivinini kanye nemvamisa ephezulu, futhi imikhiqizo yezokuxhumana ibheke ekumisweni kwezwi, ividiyo kanye nedatha yokudluliselwa okungenantambo. ngomthamo omkhulu kanye nesivinini esisheshayo. Ngakho-ke, isizukulwane esisha semikhiqizo sidinga i-baseboard ye-high-frequency. Imikhiqizo yokuxhumana efana nezinhlelo zesathelayithi kanye neziteshi eziyisisekelo zokwamukela umakhalekhukhwini kufanele zisebenzise amabhodi esekethe anemvamisa ephezulu. Eminyakeni embalwa ezayo, kufanele ithuthuke ngokushesha, futhi i-baseboard yamafrikhwensi aphezulu izodingeka kakhulu.
(1) I-thermal expansion coefficient ye-high-frequency board substrate yebhodi lesifunda kanye ne-copper foil kufanele ihambisane. Uma kungenjalo, i-foil yethusi izohlukaniswa ngenqubo yezinguquko ezibandayo nezishisayo.
(2) I-substrate yebhodi lesekhethi ephezulu kufanele ibe nokumunca amanzi aphansi, futhi ukumuncwa kwamanzi aphezulu kuzodala ukulahleka kwe-dielectric kanye ne-dielectric uma kuthintwa umswakama.
(3) I-dielectric constant (Dk) ye-high-frequency circuit board substrate kufanele ibe mncane futhi izinze. Ngokuvamile, ezincane ziba ngcono. Izinga lokudluliswa kwesignali liphambene ngokuphambene nempande yesikwele ye-dielectric constant yento. Ukungaguquguquki okuphezulu kwe-dielectric kulula ukubangela ukubambezeleka kokudluliselwa kwesignali.
(4) Ukulahleka kwe-dielectric (i-Df) ye-high-frequency circuit board substrate impahla kufanele kube kuncane, okuthinta kakhulu izinga lokudluliswa kwesignali. Okuncane ukulahlekelwa kwe-dielectric, kuncane ukulahlekelwa kwesignali.
(5) Okunye ukumelana nokushisa, ukumelana namakhemikhali, amandla okushayisana namandla ecwecwe ezinto ezisetshenziswayo zebhodi lesifunda elinemvamisa ephezulu nakho kufanele kube kuhle. Ngokuvamile, imvamisa ephezulu ingachazwa njengemvamisa engaphezu kwe-1GHz. Okwamanje, i-high-frequency circuit board substrate esetshenziswa kakhulu yi-fluorine dielectric substrate, efana ne-polytetrafluoroethylene (PTFE), evamise ukubizwa nge-Teflon futhi ivamise ukusetshenziswa ngaphezu kuka-5GHz. Ngaphezu kwalokho, i-FR-4 noma i-PPO substrate ingasetshenziselwa imikhiqizo ephakathi kuka-1GHz no-10GHz.

Njengamanje, i-epoxy resin, i-PPO resin kanye ne-fluoro resin yizinhlobo ezintathu ezinkulu ze-high-frequency circuit board substrate materials, phakathi kwazo i-epoxy resin eshibhe kakhulu, kuyilapho i-fluoro resin ibiza kakhulu; Uma kucatshangelwa ukungaguquki kwe-dielectric, ukulahleka kwe-dielectric, ukumuncwa kwamanzi kanye nezici zemvamisa, i-fluororesin iyona engcono kakhulu, kuyilapho i-epoxy resin iyona embi kakhulu. Uma imvamisa yokusetshenziswa komkhiqizo ingaphezulu kuka-10GHz, amabhodi aphrintiwe e-fluororesin kuphela angasetshenziswa. Ngokusobala, ukusebenza kwe-fluororesin high-frequency substrate kuphakeme kakhulu kunokwamanye ama-substrates, kodwa ububi bayo ukuqina okubuthakathaka kanye ne-coefficient enkulu yokwandisa okushisayo ngaphezu kwezindleko eziphezulu. Nge-polytetrafluoroethylene (PTFE), inani elikhulu lezinto ezingaphili (njenge-silica SiO2) noma indwangu yengilazi isetshenziswa njengezinto zokugcwalisa eziqinisayo ukuze kuthuthukiswe ukusebenza, ukuze kuthuthukiswe ukuqina kwesisekelo sezinto kanye nokunciphisa ukunwetshwa kwayo okushisayo.

Ngaphezu kwalokho, ngenxa ye-inertia yamangqamuzana ye-PTFE resin ngokwayo, akulula ukuhlanganisa ne-foil yethusi, ngakho-ke kuyadingeka ukwelashwa okukhethekile kwendawo yokusebenzelana ne-foil yethusi. Ngokwezindlela zokwelapha, ukucwiliswa kwamakhemikhali noma ukufakwa kwe-plasma kwenziwa phezu kwe-polytetrafluoroethylene ukuze kwandiswe ubulukhuni obungaphezulu noma kwengeze ungqimba lwefilimu enamathelayo phakathi kwe-copper foil ne-polytetrafluoroethylene resin ukuze kuthuthukiswe ukunamathela, kodwa kungase kube nomthelela ukusebenza okuphakathi. Ukuthuthukiswa kwayo yonke i-fluorine esekelwe kwi-high-frequency board substrate kudinga ukubambisana kwabahlinzeki bempahla eluhlaza, amayunithi ocwaningo, abahlinzeki bemishini, abakhiqizi be-PCB nabakhiqizi bemikhiqizo yokuxhumana, Ukuze uhambisane nentuthuko esheshayo Ibhodi lesifunda le-High-Frequencykulo mkhakha.