Iyiphi ipharamitha okufanele icatshangelwe ngokuyinhloko lapho ukhetha isihlungi se-RF?

Lapho uklama isixazululo se-RF, izihlungi ze-RF zidlala indima ebalulekile ohlelweni. Uma ukhetha isihlungi se-RF, imingcele elandelayo kufanele icatshangelwe.

1. Ifrikhwensi yesikhungo: u-f0 imfushane ku-frequency emaphakathi ye-passband yesihlungi se-RF, ngokuvamile esithathwa ngokuthi f0 = (fL+ fH) /2, futhi i-fL kanye ne-fH amaphoyinti efrikhwensi eseceleni okwehla okungu-1dB noma okungu-3dB okuhlobene. kusukela kwesokunxele nakwesokudla kwesihlungi se-band-pass noma i-band-stop. Umkhawulokudonsa we-pass-band wezihlungi ze-narrowband ngokuvamile ubalwa ngokuthatha ukulahlekelwa okuncane kokufakwa njengemvamisa emaphakathi.

2. I-Cutoff Frequency: Ngesihlungi se-low-pass, sibhekisela endaweni yefrikhwensi elungile ye-passband, futhi ngesihlungi se-high-pass, sibhekisela endaweni yefrikhwensi yesokunxele ye-passband, evame ukuchazwa ngokwemibandela ye-1dB. noma 3dB amaphuzu okulahlekelwa ahlobene. Ireferensi yokulahlekelwa okuhlobene imi kanje: esihlungini sokudlula okuphansi, ukulahlekelwa kokufaka kusekelwe ku-DC, futhi ngesihlungi sokudlula okuphezulu, ukulahlekelwa kokufaka kusekelwe kufrikhwensi yokudlula ephezulu ngaphandle kwebhendi yokumisa engamanga.

3. I-BWxdB: Ibhekisela kububanzi be-spectrum okufanele buqedwe, BWxdB= (fH-FL). I-fH ne-fL amaphoyinti efrikhwensi ahambisanayo kwesokunxele nakwesokudla ku-X (dB) ehlisiwe ngokusekelwe ekulahlekelweni kokufakwa ku-frequency emaphakathi u-f0. I-X=3, 1, 0.5, okuyi-BW3dB, BW1dB, BW0.5dB, ngokuvamile isetshenziselwa ukuveza imingcele yomkhawulokudonsa we-pass-band yesihlungi. I-fractional bandwidth =BW3dB/f0×100%, nayo ejwayele ukusetshenziselwa ukukhombisa umkhawulokudonsa webhendi yokudlula yesihlungi.

 

1. Ukulahlekelwa Kokufaka: Ngenxa yesihlungi se-RF, isignali yasekuqaleni kusekethe iyancipha, ukulahlekelwa kwayo kubonakala phakathi nendawo noma imvamisa yokusika. Uma imfuneko yokulahlekelwa kwebhendi egcwele kufanele igcizelelwe.

 

1. I-Ripple: Ibhekisela ekuphakameni-kuya-kuphakameni kokuguquguquka kokulahlekelwa kokufaka kanye nobuningi obususelwe kwijika elimaphakathi lokulahlekelwa kububanzi be-1dB noma 3dB yomkhawulokudonsa (imvamisa yokunqanyulwa).

 

 

1. I-Passband Riplpe: Isho ukuguqulwa kokulahleka kokufakwa kufrikhwensi ye-pass-band. Ukushintshashintsha kwe-pass-band ku-bandwidth engu-1dB ngu-1dB.

 

1. I-VSWR: Kuyinkomba ebalulekile ukukala ukuthi isignali kubhendi yokudlula yesihlungi ifaniswe kahle futhi idluliswa yini. I-VSWR= 1:1 eyokufanisa kahle, i-VSWR > 1 eyokungafani. Ukuze uthole isihlungi sangempela se-RF, umkhawulokudonsa owanelisa i-VSWR <1.5:1 ngokuvamile ungaphansi kwe-BW3dB, futhi ingxenye yawo ye-BW3dB ihlobene nokuhleleka kwesihlungi nokulahlekelwa kokufaka.
2. Ukulahlekelwa Kokubuyisela: Kubhekiselwa kuma-decibel esilinganiso (dB) wamandla okokufaka namandla abonisayo wembobo yesignali, nayo elingana ne-|20Log10ρ|, ρis i-voltage reflection coefficient. Ukulahlekelwa kwembuyiselo akupheli uma amandla okokufaka amuncwa imbobo.
3. Ukwenqatshwa kwe-Stopband: inkomba ebalulekile yokulinganisa ukusebenza kokukhetha kwesihlungi se-RF. Uma inkomba iphezulu, kungcono ukucindezelwa kwesignali yokuphazamiseka kwe-out-of-band. Ngokuvamile kunezindlela ezimbili zokwakheka: eyodwa iwukubuza ukuthi ingakanani i-dB fs ecindezelwa imvamisa enikeziwe engaphandle kwebhendi, futhi indlela yokubala iwukuncishiswa kwe-as-il ku-FS; Okunye ukuphakamisa inkomba ezobonisa izinga lokusondelana phakathi kwempendulo ye-amplitude-frequency yesihlungi kanye nonxande okahle -- i-coefficient kanxande (KxdB > 1), KxdB=BWxdB/BW3dB, (X ingaba ngu-40dB, 30dB, 20dB, njll.). Uma isihlungi sinama-oda amaningi, siba ngunxande kakhulu -- okusho ukuthi, uma u-K esondela kunani elifanele lika-1, kuba nzima kakhulu ukuwenza.

 

Yebo, ngaphandle kwezici ezingenhla, ungacabangela amandla alo okusebenza, isilinganiso sohlelo lokusebenza, noma ukusetshenziswa kwangaphakathi noma ngaphandle, kanye nezixhumi. Nokho, imingcele engenhla ibaluleke kakhulu ukunquma ukusebenza kwayo.

Njengomklami wezihlungi ze-RF, i-Jingxin ingakusiza odabeni lwezihlungi ze-RF, futhi wenze ngendlela oyifisayo isihlungi sokwenziwa ngokuya ngesixazululo sakho. Imininingwane eyengeziwe kungaboniswana nathi.