Nhau

Nguva: 2021-09-02

Chikamu chechiitiko nemafungu akaratidzwa panzvimbo imwe chete, amplitude yevoltage yepamusoro yeVmax, ichigadzira maantinode; mafungu akaratidzwa uye akaratidzwa ari muchikamu chakapesana maererano nevoltage yemunharaunda anoderedzwa kusvika paamplitude yevoltage shoma Vmin, kuumbwa kwenode. Imwe amplitude yepoindi yega yega iri pakati pemaantinode nenode iri pakati. Iyi wave yakagadzirwa inonzi row standing. SWR iamplitude yewave yakamira yekumanikidzwa kwenzwi padumbu Vmax uye node iri pachiyero cheamplitude yeamplitude yenzwi Vmin. Muchubhu yewave yakamira, iyo VSWR yakayerwa, zvinhu zvekutora ruzha zvinogona kuwanikwa reflection coefficient uye absorption coefficient.

Mukutaurirana kweredhiyo, kusawirirana kweantenna impedance ne feeder kana kusawirirana kwe transmitter antenna impedance, simba re high-frequency rinoburitsa kupenya kwakapetwa, uye chikamu chemberi che standing wave interference chinoitika confluence. Kuti itsanangure uye iongorore hunhu hweVSWR hwe antenna system, kureva kuti, antenna ye forward wave ne reflection wave, yakagadzira pfungwa ye "SWR",

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

Kukosha kwekufungisisa K = (Rr) / (R + r)

(K chiratidzo chekusashanda zvakanaka chinoratidza kuti chikamu chakapesana )

Apo R na r zviri output impedance uye input impedance. Kana ma values ​​maviri se impedance, ayo akaenzana zvakakwana, reflection coefficient K yakaenzana ne 0, VSWR i 1. Iyi imamiriro ezvinhu akanaka, kutaura chokwadi, inogara ichiratidzwa, zvekuti standing wave ratio inogara yakakura kupfuura 1.

Kuenzanisa kweRF system impedance. Kunyanya kutarisisa voltage muBo Bida kune zvimwe zvinodiwa, nekuti kana uchishandisa broadband frequency range yakakura kwazvo, standing wave ratio ichachinja ne frequency, uye izvi zvinofanira kuita kuti pave nekufananidza kwe wide range impedance.

Zvinoreva VSWR: VSWR inhamba inomiririra th

Tinogonawo kugadzirisa zvikamu zveRF passive zvinoenderana nezvamunoda. Munogona kupinda papeji rekugadzirisa kuti mupe zvinodiwa zvamunoda.
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