Xov xwm

Sijhawm: 2021-09-02

Theem ntawm qhov xwm txheej thiab cuam tshuam tsis zoo ib yam, qhov voltage amplitude ntawm lub siab tshaj plaws voltage amplitude sum Vmax, tsim antinodes; Qhov xwm txheej thiab qhov cuam tshuam tsis zoo nyob rau theem sib txawv ntawm cov txheeb ze ntawm lub zos voltage amplitude yog txo mus rau qhov tsawg kawg nkaus voltage amplitude Vmin, tsim ntawm lub node. Lwm qhov amplitude tus nqi ntawm txhua qhov taw tes yog nruab nrab ntawm antinodes thiab cov node ntawm. Qhov no hluavtaws hu ua kab sawv. SWR yog qhov sawv nthwv dej amplitude ntawm lub suab siab ntawm lub plab Vmax thiab qhov ntawm qhov sib piv ntawm qhov amplitude ntawm lub suab siab Vmin. Nyob rau hauv lub yoj yoj raj, ntsuas VSWR, cov khoom siv suab nrov tuaj yeem tau txais kev cuam tshuam coefficient thiab nqus coefficient.

Hauv kev sib txuas lus hauv xov tooj cua, tus kav hlau txais xov impedance tsis sib haum nrog lub feeder lossis lub transmitter kav hlau txais xov impedance mismatch, lub zog ntau zaus yuav ua rau muaj kev cuam tshuam folded, thiab rau pem hauv ntej ib feem ntawm sawv yoj cuam tshuam tshwm sim confluence. Txhawm rau ua kom tus yam ntxwv thiab ntsuas VSWR cov yam ntxwv ntawm lub kav hlau txais xov, uas yog, tus kav hlau txais xov ntawm yoj rau pem hauv ntej thiab qhov cuam tshuam yoj yog, nws tau tsim lub tswv yim "SWR",

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

Reflection coefficient K = (Rr) / (R + r)

(K yog tus nqi tsis zoo qhia tau hais tias cov theem rov qab)

Qhov twg R thiab r yog qhov tso zis impedance thiab input impedance. Thaum ob qhov tseem ceeb raws li qhov impedance, uas yog zoo kawg nkaus matched, lub reflection coefficient K yog sib npaug rau 0, VSWR yog 1. Qhov no yog ib qho zoo tagnrho qhov teeb meem, qhov tseeb, muaj ib txwm xav txog, yog li ntawd lub sawv yoj piv yog ib txwm ntau dua 1.

RF system impedance txuam. Tshwj xeeb mloog mus rau qhov voltage hauv Bo Bida rau tej yam yuav tsum tau, vim hais tias thaum koj siv lub broadband zaus ntau yam yog dav heev, sawv yoj piv yuav hloov nrog zaus, yuav tsum ua kom muaj ntau yam impedance txuam.

VSWR meaning: VSWR yog tus lej lej uas sawv cev rau th

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