Nkhani

Nthawi: 2021-09-02

Gawo la chochitikacho ndi mafunde owonetsedwa pamalo omwewo, mphamvu yamagetsi ya mphamvu yayikulu yamagetsi Vmax, ndikupanga ma antinode; mafunde owonetsedwa ndi owonetsedwa m'gawo losiyana poyerekeza ndi mphamvu yamagetsi yakomweko amachepetsedwa kufika pa mphamvu yochepa yamagetsi Vmin, kupangika kwa node. Mphamvu ina ya mphamvu ya mfundo iliyonse ili pakati pa ma antinode ndi node pakati. Mafunde opangidwa awa amatchedwa mzere woyimirira. SWR ndi mphamvu ya mafunde oyimirira ya kuthamanga kwa mawu pamimba Vmax ndi node pa chiŵerengero cha mphamvu ya kuthamanga kwa mawu Vmin. Mu chubu choyimirira cha mafunde, VSWR yoyesedwa, zinthu zoyamwa mawu zitha kupezeka mphamvu yowunikira ndi mphamvu yoyamwa.

Mu kulumikizana kwa wailesi, kusagwirizana kwa antenna impedance ndi chodyetsa kapena kusagwirizana kwa antenna impedance ya transmitter, mphamvu ya ma frequency apamwamba imapanga kuwunikira kopindika, ndipo gawo lakutsogolo la kusokoneza kwa mafunde oyima kumachitika. Pofuna kufotokoza ndikuyesa mawonekedwe a VSWR a dongosolo la antenna, ndiko kuti, antenna ya mafunde akutsogolo ndi mafunde owonetsedwa, idakhazikitsa lingaliro la "SWR",

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

Choyezera cha kuwunikira K = (Rr) / (R + r)

(K ndi mtengo woipa womwe umasonyeza kuti gawo lotsutsana)

Pamene R ndi r ndi impedance yotulutsa ndi impedance yolowetsa. Pamene ma values ​​awiri monga impedance, omwe akugwirizana bwino, coefficient yowunikira K ndi yofanana ndi 0, VSWR ndi 1. Iyi ndi mkhalidwe wabwino kwambiri, kwenikweni, nthawi zonse imawonetsedwa, kotero kuti chiŵerengero cha mafunde oyima nthawi zonse chimakhala chachikulu kuposa 1.

Kufananiza kwa impedance ya dongosolo la RF. Kusamala kwambiri pa voltage mu Bo Bida ku zofunikira zina, chifukwa mukagwiritsa ntchito ma frequency a broadband ndi otakata kwambiri, chiŵerengero cha mafunde oyima chidzasintha ndi ma frequency, ndipo izi ziyenera kupangitsa kuti pakhale ma frequency ofanana a impedance.

Tanthauzo la VSWR: VSWR ndi nambala yomwe imayimira

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