Iindaba

Ixesha : 2021-09-02

Isigaba sesiganeko kunye namaza abonakalisiweyo kwindawo enye, i-voltage amplitude ye-voltage ephezulu ye-amplitude sum Vmax, eyenza i-antinodes; isiganeko kunye namaza abonakalisiweyo kwisigaba esichaseneyo ngokumalunga ne-voltage amplitude yendawo iyancipha ukuya kwi-voltage ye-amplitude encinci ye-Vmin, ukubunjwa kwe-node. Elinye ixabiso le-amplitude yenqaku ngalinye liphakathi kwe-antinodes kunye ne-node phakathi. Eli liza lenziweyo libizwa ngokuba ngumqolo omileyo. I-SWR yi-wave wave amplitude yokuma koxinzelelo lwesandi kwi-Belly Vmax kunye ne-node kumlinganiselo we-amplitude yoxinzelelo lwesandi Vmin. Kwityhubhu yokuma yamaza, i-VSWR elinganisiweyo, imathiriyeli yokufunxa isandi inokufumaneka i-coefficient yokubonisa kunye ne-coefficient yokufunxa.

Kunxibelelwano lukanomathotholo, ukungahambelani kwe-eriyali yokuthintela ukungahambelani kunye ne-feeder okanye i-eriyali yokuhambisa i-impedance engafanelekiyo, amandla aphezulu-efrikhwensi aya kuvelisa imiboniso egotyiweyo, kwaye indawo engaphambili yophazamiseko lwamaza omileyo lwenzeka ukudibana. Ukuze uphawule kwaye ulinganise iimpawu ze-VSWR zenkqubo ye-antenna, oko kukuthi, i-eriyali ye-antenna yangaphambili kunye namaza abonakalisiweyo, yaseka ingcamango "SWR",

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

Umlinganiso wokubonakalisa K = (Rr) / (R + r)

(K lixabiso elingalunganga libonisa ukuba inqanaba elichaseneyo)

Apho i-R kunye ne-r yimveliso ye-impedance kunye ne-impedance yegalelo. Xa amaxabiso amabini njenge-impedance, ehambelana ngokugqibeleleyo, i-reflection coefficient K ilingana no-0, i-VSWR ngu-1. Le yimeko efanelekileyo, eneneni, ihlala ibonakaliswe, ukwenzela ukuba umlinganiselo wamaza omileyo uhlale umkhulu kuno-1.

Inkqubo ye-RF impedance ehambelanayo. Ingqalelo ngakumbi kumbane okwi-Bo Bida kwiimfuno ezithile, kuba xa usebenzisa uluhlu lwamaza e-broadband lubanzi kakhulu, umlinganiselo wamaza omileyo uya kutshintsha ngokuphindaphindiweyo, kufuneka wenze ukuba kubekho uluhlu olubanzi lwe-impedance ehambelanayo.

VSWR intsingiselo: I-VSWR lixabiso lamanani elimele i-th

Sisenokwenza ngokwezifiso amalungu e-rf passive ngokweemfuno zakho. Ungangenisa iphepha lokulungiselela ukubonelela ngeenkcukacha ozifunayo.
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