Izindaba

Isihlungi se-band pass

Isikhathi: 2021-11-10

Isihlungi esifanele kufanele sibe ne-passband eyisicaba ngokuphelele, isibonelo, akukho ukukhuphuka kwe-passband noma ukuncishiswa kuzo zonke imvamisa ngaphandle kwe-passband kuyancishiswa ngokuphelele. Ngaphezu kwalokho, ukuguqulwa kwe-pass-band ebangeni elincane kakhulu lemvamisa ukuze kuqedwe. Eqinisweni, asikho isihlungi se-band-pass esifanele. Isihlungi asikwazi ukulindela ukuthi wonke amaza angaphandle kwebanga lemvamisa ancishiswe ngokuphelele, ikakhulukazi, kukhona i-band okufanele incishiswe kodwa hhayi ububanzi obuhlukanisiwe. Lokhu kuvame ukubizwa ngokuthi i-filter roll-off phenomenon, kanye ne-attenuation ku-dB ngeshumi leminyaka okumele imele. Ngokuvamile, ukwakheka kwesihlungi kuzama ukuqinisekisa ukuthi i-rolloff inciphisa ububanzi bokusebenza okungcono komklamo wesihlungi onjalo. Kodwa-ke, njengoba ububanzi be-roll-off buncishiswa kancane kancane, i-pass-band ayisancishisiwe - yaqala ukubonakala "ichichima". Lesi simo sibonakala kakhulu emaphethelweni e-passband, lo mphumela ubizwa ngokuthi i-Gibbs phenomenon.

Isihlungi se-Cavity

Isihlungi se-cavity siyi-microwave filter enesakhiwo se-cavity esi-resonant. I-cavity ingalingana ne-inductance ehambisana ne-capacitor ukwakha isigaba se-resonant ukuze kufezwe umsebenzi wokuhlunga i-microwave. Uma kuqhathaniswa nezinye izinhlobo zezihlungi ze-microwave, isihlungi se-cavity sinesakhiwo esiqinile, ukusebenza okuzinzile nokuthembekile, inani eliphezulu le-Q, ukushabalalisa ukushisa okuhle, futhi i-passband yayo ye-parasitic ephezulu ikude kakhulu. Ngakho-ke, ukuhlunga kwe-cavity kusetshenziswa eziteshini ezinkulu zokuxhumana. Ukusetshenziswa kwedivayisi kuvame kakhulu.

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