Litaba

Nako: 2021-09-02

Mokhahlelo oa ketsahalo le maqhubu a bonahatsoang sebakeng se le seng, bophahamo ba motlakase ba kakaretso ea bophahamo ba motlakase bo phahameng ka ho fetisisa Vmax, bo etsa li-antinode; maqhubu a bonahatsoang le a bonahatsoang mohatong o fapaneng ha ho bapisoa le bophahamo ba motlakase ba lehae bo fokotsehile ho ea boemong ba bonyane ba motlakase Vmin, ho thehoa ha node. Boleng bo bong ba bophahamo ba ntlha ka 'ngoe bo pakeng tsa li-antinode le node e pakeng tsa. Leqhubu lena la maiketsetso le bitsoang mola o emeng. SWR ke bophahamo ba leqhubu le emeng la khatello ea molumo ka mpeng Vmax le node ka karolelano ea bophahamo ba khatello ea molumo Vmin. Ka har'a tube ea leqhubu le emeng, VSWR e lekantsoeng, thepa ea ho monya molumo e ka fumanoa boemong ba ho bonahatsa le boemong ba ho monya.

Puisanong ea seea-le-moea, ho se lumellane ha antenna impedance le feeder kapa ho se lumellane ha antenna impedance ea transmitter, matla a maqhubu a phahameng a tla hlahisa lipontšo tse mennoeng, 'me karolo e ka pele ea tšitiso ea leqhubu le emeng e etsahala kopano. E le ho hlalosa le ho lekanya litšobotsi tsa VSWR tsa sistimi ea antenna, ke hore, antenna ea leqhubu le ka pele le leqhubu le bonts'itsoeng ke, e thehile mohopolo oa "SWR",

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

Koefficient ea ho bonahatsa K = (Rr) / (R + r)

(K ke boleng bo fosahetseng bo bontša hore mohato o fapaneng)

Moo R le r e leng impedance ea tlhahiso le impedance ea ho kenya. Ha boleng bo bobeli e le impedance, e lumellanang hantle, coefficient ea ho bonahatsa K e lekana le 0, VSWR ke 1. Ena ke boemo bo loketseng, ha e le hantle, kamehla bo bonahatsoa, ​​​​e le hore karolelano ea leqhubu le emeng e lule e le kholo ho feta 1.

Ho bapisa impedance ea sistimi ea RF. Tlhokomelo e khethehileng ho motlakase ho Bo Bida ho latela litlhoko tse itseng, hobane ha u sebelisa mefuta ea maqhubu a broadband e pharaletse haholo, karolelano ea maqhubu a emeng e tla fetoha ka makhetlo, 'me e lokela ho etsa hore ho khonehe ho bapisa impedance ea mefuta e mengata.

Tlhaloso ea VSWR: VSWR ke boleng ba dipalo bo emelang

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