Maqaalkani waxa uu qeexayaa naqshada beddelka RF, oo ay weheliso jaantusyada xannibaadda, sharraxaya naqshadaynta kor u kaca ee RF iyo naqshadaynta beddelka RF. Waxay sheegaysaa qaybaha soo noqnoqda ee loo isticmaalo beddeliyaha soo noqnoqda ee C-band. Naqshadeynta waxaa lagu fuliyaa looxa microstrip iyadoo la adeegsanayo qaybaha RF ee kala duwan sida isku-dhafka RF, oscillators maxalliga ah, MMICs, synthesizers, oscillators OCXO, pads attenuator, iwm.
RF kor design Converter
Beddelaha soo noqnoqda RF waxa loola jeedaa beddelka soo noqnoqda ee hal qiime una beddelo kan kale. Aalad ka beddesha soo noqnoqoshada qiimaha hoose una beddesha qiimaha sare waxa loo yaqaan kor u beddelka. Sida ay ugu shaqeyso soo noqnoqoshada raadiyaha waxaa loo yaqaan RF up Converter. Qaabka beddelaha RF Up wuxuu tarjumayaa inta jeer ee IF inta u dhaxaysa 52 ilaa 88 MHz ilaa inta jeer ee RF ee ku saabsan 5925 ilaa 6425 GHz. Sidaa darteed waxaa loo yaqaan C-band up Converter. Waxaa loo istcimaalaa qayb ka mid ah transceiver-ka RF ee la geeyay VSAT ee loo isticmaalo codsiyada isgaarsiinta satalaytka.
Jaantus-1: RF kor u beddelka jaantuska
Aynu aragno naqshadaynta qaybta beddelaha RF Up oo leh tillaabo tallaabo tallaabo ah.
Tallaabada 1: Soo hel Mixers, oscillator Local, MMICs, synthesizer, oscillator tixraaca OCXO, pads attenuator guud ahaan waa la heli karaa.
Tallaabada 2: Samee xisaabinta heerka korantada ee heerarka kala duwan ee safka gaar ahaan gelinta MMICs si aysan uga badnayn 1dB barta qalabka.
Tallaabada 3: Naqshadeynta iyo filtarrada ku-saleysan Micro strips ee heerar kala duwan si loo shaandheeyo soo noqnoqoshada aan loo baahnayn ka dib isku-dariyeyaasha naqshadeynta iyadoo lagu saleynayo qaybta inta jeer ee aad rabto inaad gudubto.
Talaabada 4: Samee jilitaanka adigoo isticmaalaya xafiiska mikrowave ama HP EEsof firfircoon oo leh ballaadhka kirishbooyada saxda ah sida looga baahan yahay meelo kala duwan oo PCB ah ee dielectric la doortay sida looga baahan yahay inta jeer ee sidaha RF. Ha iloobin inaad u isticmaashid alaab gaashaamo ahaan sida gabbasho inta lagu jiro jilitaanka. Hubi cabbirka S.
Talaabada 5: Soo hel PCB-ga been abuurka oo iibi qaybaha la soo iibsaday oo Alxan isku mid ah.
Sida lagu muujiyey jaantuska jaantuska-1, suufka attenuator ee ku habboon midkood 3 dB ama 6dB ayaa loo baahan yahay in la isticmaalo inta u dhaxaysa si loo daryeelo 1dB barta isku xidhka ee aaladaha (MMICs iyo Mixers).
Oscillator local iyo Synthesizer ee soo noqnoqoshada ku haboon ayaa loo baahan yahay in lagu saleeyo isticmaalka. U beddelashada 70MHz ilaa C band, LO of 1112.5 MHz iyo Synthesizer ee 4680-5375MHz kala duwanaanshaha soo noqnoqda ayaa lagula talinayaa. Xeerka suulka doorashada qasaha waa awooda LO waa in ay ahaataa 10 dB ka weyn heerka ugu sareeya ee signalka P1dB. GCN waa Shabakadda Xakamaynta Gain oo loogu talagalay iyadoo la adeegsanayo attenuators PIN diode kuwaas oo kala duwanaansho ku salaysan korantada analoogga ah. Xusuusnow inaad isticmaasho shaandhada Band Pass iyo Low Pass sida iyo marka loo baahdo si aad u shaandhayso soo noqnoqoshada aan la rabin oo aad gudbiso soo noqnoqoshada la doonayo.
RF Down design
Aaladda wax ka beddeleysa inta jeer ee ka soo baxda qiimaha sare una beddesha qiimaha hoose waxaa loo yaqaannaa beddelka hoose. Sida ay uga shaqeyso soo noqnoqoshada raadiyaha waxaa loo yaqaan RF down converter. Aynu aragno naqshadaynta qaybta beddelka ee RF oo leh tillaabo tallaabo tallaabo ah. Qaabka beddelka RF-ga wuxuu u tarjumayaa inta jeer ee RF inta u dhaxaysa 3700 ilaa 4200 MHz ilaa IF inta jeer ee u dhexeeya 52 ilaa 88 MHz. Sidaa darteed waxaa loo yaqaan C-band down converter.
Jaantus-2: RF hoos u beddelka jaantuska
Jaantuska-2 waxa uu muujinayaa jaantuska xannibaadda ee C band down beddelaha iyadoo la adeegsanayo qaybaha RF. Aynu aragno naqshadaynta qaybta beddelka ee RF oo leh tillaabo tallaabo tallaabo ah.
Tallaabada 1: Laba isku-darka RF ayaa loo doortay sida naqshadda Heterodyne oo ka beddeleysa inta jeer ee RF laga bilaabo 4 GHz ilaa 1GHz kala duwan iyo 1 GHz ilaa 70 MHz. Isku-darka RF ee naqshadeynta loo isticmaalo waa MC24M iyo HADDII qasiyaha waa TUF-5H.
Talaabada 2: filtarrada ku habboon ayaa loo qaabeeyey in loo isticmaalo heerar kala duwan ee beddelaha RF. Tan waxaa ku jira 3700 ilaa 4200 MHz BPF, 1042.5 +/- 18 MHz BPF iyo 52 ilaa 88 MHz LPF.
Talaabada 3: amplifier MMIC ICs iyo attenuation pads ayaa loo isticmaalaa meelaha munaasibka ah sida ku cad jaantuska block si loo daboolo heerarka korantada ee soo saarida iyo galinta qalabka. Kuwan waxaa loo doortaa faa'iidooyin kasta iyo 1 dB dhibic cadaadis ah ee beddelaha RF.
Talaabada 4: RF synthesizer iyo LO oo loo isticmaalo naqshadaynta kor u rogaha ayaa sidoo kale loo isticmaalaa qaab beddelka hoose sida muuqata.
Talaabada 5: Go'doominta RF waxaa loo isticmaalaa meelaha ku haboon si loogu ogolaado calaamada RF inay u gudubto hal jiho (tusaale hore) iyo in la joojiyo milicsiga RF ee jihada danbe. Sidaa darteed waxaa loo yaqaanaa aaladda uni-jiho. GCN waxay u taagan tahay shabakadda xakamaynta Gain. GCN waxay u shaqeysaa sidii aaladda isbeddelka isbeddelka taasoo u oggolaanaysa dejinta wax soo saarka RF sida ay rabto isku xirka miisaaniyadda RF.
Gabagabo: Si la mid ah fikradaha lagu sheegay naqshada beddelka soo noqnoqda ee RF, qofku wuxuu naqshadayn karaa beddelayaasha soo noqnoqda ee soo noqnoqda sida L band, Ku band iyo band mmwave.
Waqtiga boostada: Dec-07-2023
