Izindaba

Isikhathi: 2021-09-02

Isigaba sesigameko namagagasi abonakalisiwe endaweni efanayo, ubukhulu be-voltage ye-voltage amplitude sum Vmax, yakha ama-antinode; amagagasi abonakalisiwe esigabeni esiphambene maqondana ne-voltage amplitude yendawo yehliswa ibe yi-voltage amplitude encane Vmin, ukwakheka kwe-node. Okunye ukubaluleka kwe-amplitude yephuzu ngalinye kuphakathi kwama-antinode ne-node ephakathi. Leli gagasi elenziwe libizwa ngokuthi ukuma komugqa. I-SWR yi-standing wave amplitude yengcindezi yomsindo esiswini i-Vmax kanye ne-node ngesilinganiso se-amplitude yengcindezi yomsindo i-Vmin. Ku-standing wave tube, i-VSWR elinganisiwe, izinto zokungenisa umsindo zingatholakala i-reflection coefficient kanye ne-absorption coefficient.

Ekuxhumaneni ngomsakazo, ukungafani kwe-antenna impedance ne-feeder noma i-transmitter antenna impedance ukungafani, amandla aphezulu azokhiqiza ukubonakaliswa okugoqiwe, futhi ingxenye engaphambili yokuphazamiseka kwamagagasi amile kwenzeka ukuhlangana. Ukuze kuchazwe futhi kulinganiswe izici ze-VSWR zesistimu ye-antenna, okungukuthi, i-antenna yegagasi eliya phambili kanye negagasi elibonakalayo, kwasungulwa umqondo we-"SWR",

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

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

(U-K uyinani elibi libonisa ukuthi isigaba esiphambene )

Lapho u-R no-r kuyi-output impedance kanye ne-input impedance. Uma amanani amabili njenge-impedance, lokho kufanelana kahle, i-reflection coefficient K ilingana no-0, i-VSWR ingu-1. Lesi yisimo esifanelekile, empeleni, sihlala sibonakala, ukuze isilinganiso segagasi elimile sihlale sikhulu kuno-1.

Ukufanisa i-impedance yesistimu ye-RF. Ukunaka okukhethekile ku-voltage e-Bo Bida ezidingweni ezithile, ngoba uma usebenzisa ububanzi bemvamisa ye-broadband bubanzi kakhulu, isilinganiso samagagasi okuma sizoshintsha ngokuvama, kufanele senze kube nokwenzeka ukufanisa i-impedance yebanga elibanzi.

Incazelo ye-VSWR: I-VSWR iyinani lezinombolo elimele i-th

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