Wannan labarin ya bayyana ƙirar mai canza RF, tare da zane-zanen tubalan, yana bayyana ƙirar mai canza RF da ƙirar mai canza RF. Ya ambaci sassan mitar da aka yi amfani da su a cikin wannan mai canza mitar C-band. Ana yin ƙirar a kan allon microstrip ta amfani da abubuwan haɗin RF daban-daban kamar mahaɗar RF, masu juyawa na gida, MMICs, masu haɗawa, masu juyawa na OCXO, masu juyawa na attenuator, da sauransu.
Tsarin canza RF sama
Mai sauya mitar RF yana nufin canza mita daga ƙima ɗaya zuwa ɗayan. Na'urar da ke canza mita daga ƙima kaɗan zuwa ƙima mai girma ana kiranta da mai sauya mita sama. Kamar yadda take aiki a mitoci na rediyo, an san ta da mai sauya mita sama da RF. Wannan na'urar mai canza mita ta RF Up tana fassara mitar IF a cikin kewayon kimanin 52 zuwa 88 MHz zuwa mitar RF na kimanin 5925 zuwa 6425 GHz. Saboda haka ana kiranta da mai canza mitar C-band up. Ana amfani da ita azaman ɓangare na mai watsa rediyon RF da aka tura a cikin VSAT da ake amfani da shi don aikace-aikacen sadarwa ta tauraron dan adam.
Siffa ta 1: Zane-zanen tubalan mai canza RF sama
Bari mu ga ƙirar ɓangaren mai canza RF Up tare da jagorar mataki-mataki.
Mataki na 1: Gano Masu Haɗawa, Mai Haɗawa na Gida, MMICs, Mai Haɗawa, Mai Haɗawa na OCXO, da kuma madannin rage zafi gabaɗaya.
Mataki na 2: Yi lissafin matakin wutar lantarki a matakai daban-daban na layin, musamman a lokacin shigar da MMICs ta yadda ba zai wuce wurin matsawa na 1dB na na'urar ba.
Mataki na 3: Tsara da kuma tace matattara masu dacewa bisa ga ƙananan ramuka a matakai daban-daban don tace mitoci marasa amfani bayan masu haɗa su a cikin ƙira bisa ga ɓangaren kewayon mitar da kake son wucewa.
Mataki na 4: Yi kwaikwayon ta amfani da ofishin microwave ko agilent HP EEs tare da faɗin jagora mai kyau kamar yadda ake buƙata a wurare daban-daban akan PCB don zaɓin dielectric kamar yadda ake buƙata don mitar mai ɗaukar RF. Kar a manta da amfani da kayan kariya azaman abin rufewa yayin kwaikwayon. Duba sigogin S.
Mataki na 5: Ka ƙera PCB ɗin sannan ka soya kayan da aka saya sannan ka soya su.
Kamar yadda aka nuna a cikin zane na tubalan hoto na 1, ana buƙatar amfani da faifan attenuator masu dacewa na ko dai 3 dB ko 6dB a tsakani don kula da wurin matsewa na 1dB na na'urorin (MMICs da Mixers).
Ya kamata a yi amfani da na'urar juyawa da na'urar haɗa na'urori masu dacewa bisa ga mitoci masu dacewa. Don sauya band 70MHz zuwa C, ana ba da shawarar LO na 1112.5 MHz da kuma na'urar haɗa na'urori masu ƙarfin 4680-5375MHz. Dokar da ta fi dacewa don zaɓar na'urar haɗa na'urori ita ce ƙarfin LO ya kamata ya zama 10 dB fiye da matakin siginar shigarwa mafi girma a P1dB. GCN Cibiyar Sadarwar Gain Control ce da aka tsara ta amfani da na'urorin rage ƙarfin lantarki na PIN waɗanda ke bambanta raguwa bisa ga ƙarfin lantarki na analog. Ka tuna ka yi amfani da matattarar Band Pass da matattarar ƙarancin wucewa kamar yadda ake buƙata don tace mitoci marasa so da kuma wuce mitoci da ake so.
Tsarin RF Down converter
Na'urar da ke canza mita daga babban ƙima zuwa ƙarancin ƙima ana kiranta da mai sauya siginar ƙasa. Kamar yadda take aiki a mitoci na rediyo, an san ta da mai sauya siginar ƙasa ta RF. Bari mu ga ƙirar ɓangaren mai sauya siginar ƙasa ta RF tare da jagorar mataki-mataki. Wannan na'urar mai sauya siginar ƙasa ta RF tana fassara mitar RF a cikin kewayon daga 3700 zuwa 4200 MHz zuwa mitar IF a cikin kewayon daga 52 zuwa 88 MHz. Don haka ana kiranta da mai sauya siginar ƙasa ta C-band.
Siffa ta 2: Zane-zanen tubalan mai canza RF mai saukar da ƙasa
Siffa ta 2 tana nuna zane-zanen tubalan na mai canza band C ta amfani da abubuwan RF. Bari mu ga ƙirar ɓangaren mai canza RF tare da jagorar mataki-mataki.
Mataki na 1: An zaɓi mahaɗan RF guda biyu bisa ga ƙirar Heterodyne wanda ke canza mitar RF daga kewayon 4 GHz zuwa 1GHz da kuma daga kewayon 1 GHz zuwa 70 MHz. Mahaɗan RF da aka yi amfani da shi a cikin ƙirar shine MC24M kuma mahaɗan IF shine TUF-5H.
Mataki na 2: An tsara matatun da suka dace don amfani da su a matakai daban-daban na na'urar canza RF. Wannan ya haɗa da 3700 zuwa 4200 MHz BPF, 1042.5 +/- 18 MHz BPF da 52 zuwa 88 MHz LPF.
Mataki na 3: Ana amfani da na'urorin ƙara ƙarfin MMIC da kuma na'urorin rage ƙarfin lantarki a wurare masu dacewa kamar yadda aka nuna a cikin zane na toshe don cika matakan wutar lantarki a fitarwa da shigarwar na'urorin. Ana zaɓar waɗannan gwargwadon gata da buƙatar matsi na 1 dB na na'urar canza RF.
Mataki na 4: Ana amfani da na'urar haɗa RF da LO da aka yi amfani da su a cikin ƙirar mai canza sama a cikin ƙirar mai canza ƙasa kamar yadda aka nuna.
Mataki na 5: Ana amfani da masu raba RF a wurare masu dacewa don ba da damar siginar RF ta wuce a hanya ɗaya (watau gaba) da kuma dakatar da hasken RF ɗinta a alkiblar baya. Saboda haka ana kiranta da na'urar da ke da alkibla ɗaya. GCN tana nufin cibiyar sadarwa ta Gain. GCN tana aiki azaman na'urar rage yawan canji wanda ke ba da damar saita fitarwar RF kamar yadda kasafin kuɗin haɗin RF yake so.
Kammalawa: Kamar yadda aka ambata a cikin wannan ƙirar mai canza mitar RF, mutum zai iya tsara masu canza mitar a wasu mitoci kamar su band na L, band na Ku da band na mmwave.
Lokacin Saƙo: Disamba-07-2023
