I-VSWR ibilokhu ingelinye lamapharamitha abaluleke kakhulu ezinhlelweni ze-RF ngoba ikhombisa ukusebenza kahle kwalo lonke uhlelo lwe-RF.

Uma usebenzisa isiteshi somsakazo, khona-ke kufanele ukhathazeke ngoxhumo phakathi kwe-antenna kanye ne-feeder, ngoba kuphela uma ifaniswe kahle, izokwenza isiteshi sakho somsakazo sisakazwe ngendlela esebenza kahle kakhulu noma i-VSWR ephansi kakhulu.

Ngakho-ke, yini i-VSWR? Ngenhlanhla, naphezu kobunzima bethiyori ye-VSWR, lesi sihloko singachaza umqondo kanye nalokho okudingeka ukwazi ngendlela elula ukuyiqonda. Noma ungumqali we-RF, ungayiqonda kalula incazelo ye-VSWR. Ake siqale!

Iyini i-VSWR?

Okokuqala, sidinga ukwazi ukuthi liyini igagasi elimile. Amagagasi amile amele amandla angamukelwe umthwalo futhi aphinde abonakale emugqeni wokudlulisela noma okokuphakelayo. 

Akekho ongafuna ukuthi lokhu kwenzeke, ngoba ukubukeka kwamagagasi amile egameni le-RF kunciphile ukusebenza kahle kwesistimu.

Futhi sidinga ukuchaza incazelo ye-VSWR ngokwezibalo, lokho isilinganiso senani eliphezulu le-voltage kulayini we-RF ukuya kunani elincane. 

Ngakho-ke, ngokuvamile ivezwa ngokuthi 2:1, 5:1, ∞:1, njll. Lapho u-1:1 esho ukuthi ukusebenza kahle kwalolu hlelo lwe-RF kufinyelela ku-100%, kuyilapho u-∞:1 esho ukuthi yonke imisebe yamandla ibuyiselwa emuva. . Kube umphumela wokungafani kwe-impedance eduze kolayini wokudlulisela.

Ukuze uthole ukudluliswa kwamandla aphezulu ukusuka emthonjeni ukuya emugqeni wokudlulisela, noma ulayini wokudlulisela kumthwalo, kungaba isixhasi, okokufaka kwenye isistimu, noma i-antenna, amazinga we-impedance kufanele afane.

Ngamanye amazwi, ohlelweni lwe-50Ω, umthombo noma ijeneretha yesignali kufanele ibe nokuvinjelwa komthombo okungu-50Ω, ulayini wokudlulisela kumele ube ngu-50Ω kanjalo nomthwalo.

Empeleni, kukhona ukulahlekelwa kunoma iyiphi i-feeder noma ulayini wokudlulisela. Ukulinganisa i-VSWR, amandla okudlulisela phambili nangemuva atholwa ngaleso sikhathi ohlelweni futhi lokhu kuguqulwa kube isibalo se-VSWR. Ngale ndlela, i-VSWR ikalwa endaweni ethile futhi i-voltage maxima ne-minima ayidingi ukunqunywa ngobude bomugqa.

Uyini Umehluko phakathi kwe-SWR ne-VSWR?

Amagama okuthi VSWR kanye ne-SWR avela kaningi ezincwadini ezikhuluma ngamagagasi amile ezinhlelweni ze-RF, futhi abantu abaningi bayazibuza ukuthi kuyini ukuhlukaniswa. Futhi nakhu okudingayo:

I-SWR: I-SWR imele i-Standing Wave Ratio. Ichaza i-voltage kanye namagagasi amile akhona avela kulayini. Kuyincazelo evamile yamagagasi amanje kanye namagagasi amile. Ivamise ukusetshenziswa ngokuhambisana nemitha esetshenziselwa ukuthola i-VSWR.

I-VSWR: I-VSWR noma i-voltage stand wave ratio isho ngokuqondile ukuthi amaza amile kagesi abekwe ku-feeder noma kulayini wokudlulisa. Igama elithi VSWR livame ukusetshenziswa, ikakhulukazi ekwakhiweni kwe-RF, ngoba kulula ukubona amagagasi amile kagesi futhi, ezimweni eziningi, i-voltage ibaluleke kakhulu ngokwehlukana kwedivayisi.

Konke ngamagama, incazelo ye-VSWR ne-SWR ziyefana ngaphansi kwezimo eziqinile.

I-VSWR Iwathinta Kanjani Ama-RF Systems?

Kunezindlela ezimbalwa i-VSWR ezingathinta ngayo ukusebenza kohlelo lokudlulisela noma yiluphi uhlelo olungasebenzisa i-RF kanye nokulingana okufanayo. Okulandelayo uhlu olufushane lwezicelo:

1. Izikhulisamandla zokudlulisa amandla zingaphulwa - Ukwenyuka kwamazinga kagesi kanye namazinga amanje kulayini wokuphakelayo ngenxa ye-VSWR kungalimaza ama-transistors aphumayo wesidluliseli.

2. Ukuvikelwa kwe-PA kunganciphisa amandla okukhipha - Ukungafani phakathi kwe-feedline kanye ne-antenna kuzoholela ku-SWR ephezulu, okungase kuqalise izinyathelo zokuvikela isekethe ezingaholela ekuncipheni kokuphumayo, okuholela ekulahlekelweni okukhulu kwamandla okudlulisa.

3. Amazinga aphezulu kagesi kanye namanje angalimaza ulayini wokuphakelayo - I-voltage ephezulu kanye namazinga amanje abangelwa i-VSWR ephezulu angabangela umonakalo kulayini wokuphakelayo.

4. Ukubambezeleka okubangelwa ukucabanga kungaholela ekuhlanekeni - Uma isignali ingafaniswa futhi iboniswa, iboniswa emuva emthonjeni futhi ingaphinde iboniswe emuva othini futhi. Ukubambezeleka okwethulwe kulingana nesikhathi esiphindwe kabili sokudlulisela isignali emugqeni wokuphakelayo.

5. Ukwehliswa kwesignali uma kuqhathaniswa nesistimu efaniswe ngokuphelele - Noma iyiphi isignali eboniswa umthwalo izoboniswa emuva kumthumeli futhi ingenziwa ukuthi ibonise emuva ku-antenna futhi, okubangela ukuncishiswa kwesignali.

Isiphetho

Kulesi sihloko, siyayazi incazelo ye-VSWR, umehluko phakathi kwe-VSWR ne-SWR, nokuthi i-VSWR izithinta kanjani izinhlelo ze-RF.

Ngalolu lwazi, nakuba ungeke ukwazi ukuxazulula ngokuphelele izinkinga ongahlangabezana nazo nge-VSWR, ungaba nombono ocacile ngakho futhi uzame ukugwema umonakalo ongakulethela wona.

Uma ufuna ukwazi okwengeziwe ngokusakazwa komsakazo, silandele!