Litaba

Nako: 2021-09-02

Karolo ea ketsahalo le maqhubu a bonahatsa sebakeng se le seng, amplitude ea voltage ea amplitude e phahameng ka ho fetisisa ea Vmax, ho etsa li-antinode; ketsahalo le maqhubu a bonahatsoang mokhahlelong o fapaneng mabapi le amplitude ea motlakase ea sebakeng seo e fokotsehile ho ea ho bonyane ba amplitude ea Vmin, sebopeho sa node. Boleng bo bong ba amplitude ea ntlha ka 'ngoe bo pakeng tsa li-antinode le node lipakeng. Leqhubu lena la maiketsetso le bitsoa row stand. SWR ke bophahamo ba maqhubu a emeng a khatello ea molumo ka mpeng ea Vmax le node ka karo-karolelano ea amplitude ea khatello ea molumo Vmin. Ka har'a tube e emeng ea wave, VSWR e lekantsoeng, lisebelisoa tsa ho monya molumo li ka fumanoa coefficient e bonts'ang le coefficient ea ho monya.

Puisanong ea seea-le-moea, "antenna impedance impedance" e sa tsamaisaneng le phepelo kapa phepelo ea phepelo ea li-antenna, matla a maqhubu a phahameng a tla hlahisa likhakanyo tse phuthoang, 'me karolo e ka pele ea tšitiso ea leqhubu le emeng e etsahala. Bakeng sa ho tšoaea le ho lekanya litšobotsi tsa VSWR tsa sistimi ea antenna, ke hore, antenna ea leqhubu la pele le leqhubu le bonts'itsoeng, e thehile mohopolo oa "SWR",

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

Coefficient ea setšoantšo K = (Rr) / (R + r)

(K ke boleng bo fosahetseng bo bontša hore karolo e fapaneng)

Moo R le r ho nang le impedance ea tlhahiso le impedance ea ho kenya. Ha litekanyetso tse peli e le impedance, e ts'oanang hantle, coefficient ea reflection K e lekana le 0, VSWR ke 1. Ena ke boemo bo loketseng, ha e le hantle, ho na le kamehla ho bontšoang, e le hore karolelano ea maqhubu a emeng e lula e le kholo ho feta 1.

Khokahano ea ts'ebetso ea RF ho ts'oana. Tlhokomelo e khethehileng ho matla a Bo Bida ho litlhoko tse itseng, hobane ha u sebelisa marang-rang a marang-rang a marang-rang a pharaletseng haholo, tekanyo ea maqhubu a emeng e tla fetoha ka makhetlo a mangata, e lokela ho etsa hore ho khonehe hore ho be le mefuta e mengata e fapaneng ea ts'oaetso.

Tlhaloso ea VSWR: VSWR ke boleng ba linomoro bo emelang th

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