Xov xwm

Lub Sijhawm: 2021-09-02

Theem ntawm qhov xwm txheej thiab nthwv dej cuam tshuam tib qho chaw, qhov voltage amplitude ntawm qhov siab tshaj plaws voltage amplitude sum Vmax, tsim cov antinodes; qhov xwm txheej thiab nthwv dej cuam tshuam hauv theem rov qab piv rau qhov voltage amplitude hauv zos raug txo kom qhov tsawg kawg nkaus voltage amplitude Vmin, tsim cov node. Lwm qhov amplitude tus nqi ntawm txhua qhov taw tes yog nyob nruab nrab ntawm cov antinodes thiab cov node nruab nrab. Cov nthwv dej tsim no hu ua kab sawv ntsug. SWR yog qhov nthwv dej sawv ntsug ntawm lub suab siab ntawm lub plab Vmax thiab lub node ntawm qhov piv ntawm qhov amplitude ntawm lub suab siab Vmin. Hauv lub raj nthwv dej sawv ntsug, VSWR ntsuas, cov khoom siv nqus suab tuaj yeem tau txais cov coefficient reflection thiab coefficient nqus.

Hauv kev sib txuas lus hauv xov tooj cua, lub antenna impedance mismatch nrog lub feeder lossis lub transmitter antenna impedance mismatch, lub zog siab zaus yuav tsim cov kev cuam tshuam folded, thiab qhov pem hauv ntej ntawm kev cuam tshuam nthwv dej sawv ntsug tshwm sim confluence. Txhawm rau kom paub txog thiab ntsuas cov yam ntxwv VSWR ntawm lub antenna system, uas yog, lub antenna ntawm nthwv dej pem hauv ntej thiab nthwv dej reflected yog, nws tau tsim lub tswv yim "SWR",

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

Kev cuam tshuam ntawm qhov cuam tshuam K = (Rr) / (R + r)

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

Qhov twg R thiab r yog qhov tso zis impedance thiab qhov nkag impedance. Thaum ob tus nqi ua impedance, uas yog phim zoo kawg nkaus, qhov kev cuam tshuam coefficient K yog sib npaug rau 0, VSWR yog 1. Qhov no yog qhov xwm txheej zoo tagnrho, qhov tseeb, yeej ib txwm muaj kev cuam tshuam, yog li ntawd qhov piv ntawm nthwv dej sawv ntsug yeej ib txwm ntau dua 1.

RF system impedance matching. Kev saib xyuas tshwj xeeb rau qhov voltage hauv Bo Bida raws li qee qhov yuav tsum tau ua, vim tias thaum koj siv qhov broadband frequency range dav heev, qhov sawv nthwv dej piv yuav hloov pauv nrog zaus, yuav tsum ua kom muaj qhov sib phim impedance ntau yam.

VSWR lub ntsiab lus: VSWR yog tus nqi lej uas sawv cev rau th

Peb kuj tseem tuaj yeem kho cov khoom siv rf passive raws li koj xav tau. Koj tuaj yeem nkag mus rau nplooj ntawv kho kom raug kom muab cov lus qhia koj xav tau.
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