Ngaphandle kwesihlungi ekugcineni kwe-RF, umphumela wokwamukela uzoncishiswa kakhulu. Singakanani isaphulelo? Ngokuvamile, ngama-antenna amahle, ibanga lizoba libi kakhulu izikhathi ezi-2. Futhi, ukuphakama kwe-antenna, kubi kakhulu ukwamukela! Kungani kunjalo? Ngenxa yokuthi isibhakabhaka sanamuhla sigcwele izimpawu eziningi, lezi zimpawu zivimba ishubhu eyamukelayo ngaphambili. Njengoba isihlungi esingaphambili sibaluleke kakhulu, usenza kanjani isihlungi esingaphambili? I-Rf industry senior master ukukufundisa! Kodwa-ke, isihlungi esingaphambili sebhendi ye-435MHz akulula kakhulu ukusengeza. Ake siqale ukuhlaziya
Lena isethi yezihlungi ze-Chebyshev band-pass ene-top capacitor coupling kanye nemvamisa yesikhungo engu-435MHz. Ngenxa yokusetshenziswa kwama-chip inductors atholakala ngokwentengiso (enenani elingu-Q elifika ku-70), ukulahlekelwa kokufaka kukhulu kakhulu, kufinyelela ku- -11db, kanti elinye ijika liwukubonakaliswa (okungaguqulelwa amagagasi amile). Ngakho-ke, ukuzwela kowamukelayo kuthinteka kakhulu, ngoba ukuzwela kowamukelayo kuhlobene ngokuqondile nesibalo somsindo wesigaba sokuqala sokukhulisa ukuphakama, noma ngabe ubuchwepheshe buhle, njengesibalo somsindo wokukhulisa ukuphakama kungalawulwa. ukuya ku-0.5, kodwa ukulahlekelwa kwepulaki yesihlungi sangaphambili empeleni kuzokwenyusa inani lomsindo ngo-11db. Ngakho-ke akuvamile ukubona esetshenziswa kanje. Buka lesi sithombe futhi:
Gcina amanye amapharamitha, i-inductor ithathelwa indawo ikhoyili engenalutho engcono, nakuba ivolumu inkulu, kodwa ukulahlekelwa kokufaka kuba cishe -5, okusetshenziselwa ukusetshenziswa, kodwa kusenzima kakhulu ukwenza. Ngoba: I-coupling capacitance phezulu i-0.2P kuphela, futhi amandla alo mthamo akulula kakhulu ukuthenga, ngakho-ke ungakwazi kuphela ukudweba i-capacitor ku-PCB, okuletha ubunzima empumelelweni engu-1. Ngisho ne-inductor engu-12nH ayilungile kakhulu ukushaywa umoya, futhi kufanele ibe ngenalutho futhi ixhumeke phakathi, futhi akukuhle ukwazi uma kungekho ulwazi olwanele. I-inductance iseyinkulu kancane, imingcele yalawo ma-capacitor azwela kakhulu, futhi ushintsho oluncane luzothinta ukusebenza. Ngakho-ke kuthiwani uma ungaqhubeka nokwandisa inani le-Q le-inductor, futhi kukhona indlela yokuqhubeka nokunciphisa amandla okuhlanganisa? Bese unciphisa umkhawulokudonsa kancane. Isimo sizoba kanje:
Inani le-inductance Q lalesi sibalo ngokuzumayo liba ngu-1600, futhi i-inductance nayo iba nkulu, igrafu iba yinhle kakhulu, lesi sihlungi singaqinisekisa ukukhetha nokuzwela kowamukelayo nezinye izinkomba, uma kungekho ukucatshangelwa kokusetshenziswa kwamandla ngqo ngemuva kocezu lwe-IC, ngokuzumayo udonse ibanga ukhuphuke. Ukusebenza okungcono, kodwa usayizi yisihlungi se-microstrip esikhulu kakhulu
Idizayini yesihlungi esivunguzayo esisebenzayo Kulesi sihlungi esivunguzayo, abantu abambalwa nabambalwa bazoklama ngempela eShayina, futhi isofthiwe empeleni ingahlanganiswa kahle. Okokuqala, isithombe sangaphambilini sethula isihlungi sangempela esivunguzayo samadivayisi eselula angama-435MHz. Eqinisweni, izihlungi ezingcono kufanele zikhishwe ngomshini ngokuqinile, sizoklama izihlungi zekhwalithi ephezulu ze-2-cavity kanye ne-4-cavity zalo mshini wokuhlola.
Isikhathi sokuthumela: Jul-17-2024