Ndi gawo liti lomwe liyenera kuganiziridwa makamaka posankha fyuluta ya RF?

Mukapanga yankho la RF, zosefera za RF zimagwira ntchito zazikulu pamakina. Mukasankha RF fyuluta, magawo otsatirawa ayenera kuganiziridwa.

1. Pakati pafupipafupi: f0 ndi yachidule pa frequency yapakati ya passband ya RF fyuluta, yomwe nthawi zambiri imatengedwa ngati f0 = (fL+ fH) /2, ndi fL ndi fH ndi ma frequency apakati a 1dB wachibale kapena 3dB dontho. kuchokera kumanzere ndi kumanja kwa band-pass kapena band-stop fyuluta. The pass-band bandwidth of narrowband filters nthawi zambiri amawerengedwa potengera kutayika kocheperako ngati ma frequency apakati.

2. Cutoff Frequency: Kwa fyuluta yotsika, imatanthawuza kufupi kwafupipafupi kwa passband, ndi fyuluta yapamwamba, imatanthawuza kumanzere kwafupipafupi kwa passband, yomwe nthawi zambiri imatanthauzidwa ndi 1dB. kapena 3dB mfundo zotayika. Kufotokozera kwa kutayika kwachibale kuli motere: kwa fyuluta yotsika, kutayika koyikirako kumachokera ku DC, ndipo kwa fyuluta yapamwamba kwambiri, kutayika koyikapo kumachokera kufupipafupi kwapamwamba kwambiri popanda spurious stop-band.

3. BWxdB: Imatanthawuza kukula kwa sipekitiramu yomwe iyenera kuwoloka, BWxdB= (fH-FL). fH ndi fL ndi ma frequency ofananira kumanzere ndi kumanja pa X (dB) otsitsidwa kutengera kutayika kwapakati pa frequency f0. X = 3, 1, 0.5, zomwe ndi BW3dB, BW1dB, BW0.5dB, nthawi zambiri amagwiritsidwa ntchito kuzindikiritsa magawo a bandwidth a fyuluta. Fractional bandwidth = BW3dB/f0×100%, yomwe imagwiritsidwanso ntchito kuzindikiritsa bandwidth ya pass-band ya fyuluta.

 

1. Kutayika Kwambiri: Chifukwa cha fyuluta ya RF, chizindikiro choyambirira muderali chimachepetsedwa, kutayika kwake kumadziwika pakati kapena pafupipafupi. Ngati kufunikira kwa kutaya kwa gulu lonse kuyenera kutsindika.

 

1. Ripple: Imatanthawuza nsonga-mpaka-pamtunda wa kusinthasintha kwa kutayika kwa kuyika ndi mafupipafupi kutengera kutayika kwapakati pamtundu wa 1dB kapena 3dB bandwidth (mafupipafupi odulidwa).

 

 

1. Passband Riplpe: Zimatanthawuza kusintha kwa kutayika kwa kuyika kwa ma frequency a pass-band. Kusinthasintha kwa pass-band mu 1dB bandwidth ndi 1dB.

 

1. VSWR: Ndichizindikiro chofunikira kuyeza ngati chizindikiro chomwe chili mu gulu lodutsa la fyuluta chikugwirizana bwino ndikufalitsidwa. VSWR= 1:1 ndi yofanana bwino, VSWR> 1 ndi yosagwirizana. Pazosefera zenizeni za RF, bandwidth yokhutiritsa VSWR <1.5:1 nthawi zambiri imakhala yocheperako kuposa BW3dB, ndipo gawo lake la BW3dB limagwirizana ndi dongosolo la fyuluta ndi kutayika koyika.
2. Kutaya Kubwerera: Kumatanthauza chiŵerengero cha ma decibel (dB) a mphamvu yolowetsa ndi mphamvu yowonetsera ya doko la sigino, yomwenso ndi yofanana ndi |20Log10ρ|, ρis voltage reflection coefficient. Kutayika kobwerera kulibe malire pamene mphamvu yolowetsa imatengedwa ndi doko.
3. Kukana kwa Stopband: index yofunikira yoyezera magwiridwe antchito a RF fyuluta. Mlozerawu ukakhala wapamwamba, ndiye kuti kuponderezedwa kwa chizindikiro chosokoneza chakunja ndikwabwino. Nthawi zambiri pamakhala mitundu iwiri: imodzi ndiyo kufunsa kuchuluka kwa dB fs komwe kumaponderezedwa pamafupipafupi operekedwa kunja kwa gulu, ndipo njira yowerengera ndiyo kutsitsa ngati-il pa FS; Lina ndiloti lipereke chilolezo chosonyeza kuchuluka kwa kuyandikira kwa kuyankha kwa matalikidwe a fyuluta ndi rectangle yoyenera -- rectangle coefficient (KxdB> 1), KxdB=BWxdB/BW3dB, (X ikhoza kukhala 40dB, 30dB, 20dB, etc.). Maoda ochulukira omwe fyulutayo imakhala nayo, imakhala yamakona anayi -- ndiye kuti, pafupi ndi K ndi mtengo wofunikira wa 1, m'pamenenso zimakhala zovuta kupanga.

 

Zachidziwikire, kupatula zomwe zili pamwambazi, mutha kuganizira mphamvu zake zogwirira ntchito, muyeso wa pulogalamuyo, kapena kugwiritsa ntchito m'nyumba kapena kunja, komanso zolumikizira. Komabe, magawo omwe ali pamwambawa ndi ofunikira kwambiri pakusankha momwe amagwirira ntchito.

Monga mlengi wa RF Zosefera, Jingxin akhoza kukuthandizani pa nkhani ya RF Zosefera, ndi makonda fyuluta kungokhala monga yankho lanu. Zambiri zitha kufunsidwa nafe.