Nkhani

Nthawi: 2021-09-02

Gawo la chochitika ndi kusonyeza mafunde malo omwewo, voteji matalikidwe a pazipita voteji matalikidwe ndalama Vmax, kupanga antinodes; chochitika ndi kuwonetseredwa mafunde mu gawo zosiyana wachibale voteji matalikidwe yafupika kwa osachepera voteji matalikidwe Vmin, mapangidwe mfundo. Ena matalikidwe mtengo wa mfundo iliyonse ndi pakati antinodes ndi mfundo pakati. Mafunde opangidwawa amatchedwa mzere woima. SWR ndiye kuyimirira kwa mafunde amphamvu yamawu pamimba Vmax ndi mfundo pa chiŵerengero cha matalikidwe a kukakamiza kwa mawu Vmin. Mu chubu choyimirira, VSWR yoyezedwa, zinthu zoyamwitsa zomveka zitha kupezedwa koyenelera komanso kuyamwa.

Mukulankhulana pawailesi, kusagwirizana kwa mlongoti ndi wodyetsa kapena kusagwirizana kwa mlongoti wa transmitter, mphamvu yothamanga kwambiri imatulutsa zowoneka bwino, ndipo gawo lakutsogolo la kusokoneza kwa mafunde kumachitika. Kuti muzindikire ndikuyesa mawonekedwe a VSWR a kachitidwe ka antenna, ndiye kuti, mlongoti wa mafunde akutsogolo ndi mawonekedwe owonekera, adakhazikitsa lingaliro la "SWR",

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

Chiyerekezo choyezera K = (Rr) / (R + r)

(K ndi mtengo woipa umasonyeza kuti gawo lina)

Momwe R ndi r ndizomwe zimapangidwira komanso zolowera. Pamene zikhalidwe ziwirizo ngati zolepheretsa, zomwe zimagwirizana bwino, chiwonetsero chowonetsera K ndi chofanana ndi 0, VSWR ndi 1. Izi ndizochitika zabwino, makamaka, nthawi zonse zimawonetsedwa, kotero kuti chiŵerengero cha mafunde oima nthawi zonse chimakhala chachikulu kuposa 1.

RF system impedance yofananira. Chisamaliro makamaka voteji mu Bo Bida zofunika zina, chifukwa pamene inu ntchito burodibandi pafupipafupi osiyanasiyana ndi lonse, kuyimirira yoweyula chiŵerengero kusintha ndi pafupipafupi, ayenera zotheka osiyanasiyana impedance yofananira.

VSWR tanthauzo: VSWR ndi nambala yomwe imayimira th

Titha kusinthanso magawo a rf passive malinga ndi zomwe mukufuna. Mutha kulowa patsamba losintha kuti mupereke zomwe mukufuna.
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