Izindaba

Isikhathi: 2021-09-02

Isigaba sesigameko kanye namagagasi abonisiwe endaweni efanayo, i-voltage amplitude ye-voltage amplitude esiphezulu isamba se-Vmax, akha ama-antinode; isigameko namaza abonisiwe esigabeni esiphambene ngokuhlobene ne-voltage amplitude yendawo yehliswa ibe ubuncane be-voltage amplitude Vmin, ukwakheka kwenodi. Elinye inani le-amplitude lephoyinti ngalinye liphakathi kwama-antinode nendawo ephakathi. Leli gagasi lokwenziwa libizwa ngokuthi ukuma komugqa. I-SWR iwukuphakama kwegagasi elimile lokucindezela komsindo esiswini se-Vmax kanye nenodi esilinganisweni sokuphakama komsindo we-Vmin. Kuthubhu yegagasi emile, i-VSWR elinganisiwe, okokusebenza kokumunca umsindo kungatholwa i-reflection coefficient kanye ne-coefficient yokumunca.

Ezokuxhumana ngomsakazo, i-antenna impedance ingqubuzana nesiphakeli noma i-antenna impedance impedance yokudlulisela, amandla amafrikhwensi aphezulu azokhiqiza ukuboniswa okugoqiwe, futhi ingxenye engaphambili yokuphazamiseka kwegagasi elimile kwenzeka ukuhlangana. Ukuze uveze futhi ulinganise izici ze-VSWR zohlelo lwe-antenna, okungukuthi, i-antenna yegagasi eliya phambili kanye namagagasi abonisiwe, isungule umqondo we- "SWR",

SWR = R / r = (1 + K) / (1-K)

I-reflection coefficient K = (Rr) / (R + r)

(U-K uyinani elingalungile libonisa ukuthi isigaba esiphambene)

Lapho u-R no-r kukhona i-impedance yokukhipha kanye ne-impedance yokokufaka. Uma amanani amabili njenge-impedance, efaniswa ngokuphelele , i-reflection coefficient K ilingana no-0, i-VSWR ingu-1. Lesi isimo esihle, empeleni, sihlala siboniswa, ukuze isilinganiso samagagasi amile sihlale sikhulu kuno-1.

Ukufanisa i-impedance yesistimu ye-RF. Ukunakwa okukhethekile ku-voltage ku-Bo Bida ezidingweni ezithile, ngoba uma usebenzisa i-broadband frequency range ibanzi kakhulu, i-stand wave ratio izoshintsha ngokuvama, kufanele yenze kube khona ukumedaniswa kwe-impedance okubanzi.

Incazelo ye-VSWR: I-VSWR iyinani lenombolo elimele u-th

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