Yeyiphi ipharamitha ekufuneka iqwalaselwe ikakhulu xa ukhetha isihluzo seRF?

Xa kuyilwa isisombululo seRF, izihluzi zeRF zidlala indima ebalulekileyo kwinkqubo. Ukuba ukhetha isihluzo seRF, ezi parameters zilandelayo kufuneka ziqwalaselwe.

1. I-frequency yombindi: f0 imfutshane kumbindi wefrikhwensi ye-passband ye-RF filter, ethathwa ngokubanzi njenge-f0 = (fL+ fH) /2, kunye ne-fL kunye ne-fH ngamanqaku e-frequency yecala le-1dB okanye i-3dB yehla. ukusuka ekhohlo nasekunene kwe band-pass okanye band-stop lokucoca. I-bandwidth ye-pass-band ye-narrowband filters idla ngokubalwa ngokuthatha ilahleko encinci yokufaka njenge-frequency center.

2. I-Cutoff Frequency: Kwi-low-pass filter, ibhekisela kwi-right frequency point ye-passband, kunye ne-high-pass filter, ibhekisela kwindawo yasekhohlo ye-frequency point of passband, edla ngokuchazwa ngokwe-1dB. okanye 3dB amanqaku ilahleko isihlobo. Isalathiso selahleko esinxulumeneyo simi ngolu hlobo lulandelayo: kwisihluzo sokupasa esisezantsi, ilahleko yokufaka isekelwe kwi-DC, kunye nesihluzo sokupasa okuphezulu, ilahleko yokufaka isekelwe kwi-frequency ephezulu yokupasa ngaphandle kwebhendi yokumisa.

3. BWxdB: Ibhekisa kububanzi bespectrum ekufuneka igqitywe, BWxdB= (fH-FL). I-fH kunye ne-fL ngamanqaku ahambelanayo asekhohlo nasekunene e-X (dB) athotywe ngokusekelwe kwilahleko yokufaka kwiziko lefrikhwensi f0. X=3, 1, 0.5, ezizezi BW3dB, BW1dB, BW0.5dB, zidla ngokusetyenziswa ukubonisa iparameters ye-pass-band bandwidth yesihluzi. Ibhanwidth yefractional =BW3dB/f0×100%, ikwasetyenziswa ngokuqhelekileyo ukubonisa ibhendi yokugqitha yesihluzi.

 

1. Ilahleko yokuFaka: Ngenxa yesihluzi seRF, isignali yokuqala kwisekethe iyancipha, ilahleko yayo ibonakaliswe embindini okanye kwi-cutoff frequency. Ukuba imfuno yelahleko epheleleyo kufuneka igxininiswe.

 

1. I-Ripple: Ibhekisela kwi-peak-to-peak yokunyuka kwelahleko yokufaka kunye ne-frequency based on the mean loss curve in the range of 1dB okanye 3dB bandwidth (cut-off frequency).

 

 

1. I-Passband Riplpe: Ibhekisa kutshintsho lwelahleko yokufaka kwi-frequency pass-band frequency. Ukuguquguquka kwebhendi yokudlula kwi-1dB bandwidth yi-1dB.

 

1. I-VSWR: Sisalathisi esibalulekileyo ukulinganisa ukuba isignali kwi-pass-band ye-filter ihambelana kakuhle kwaye idluliselwe. I-VSWR= 1:1 yeyomdlalo ofanelekileyo, i-VSWR > 1 yeyokungafani. Kwi-RF yokucoca yokwenyani, i-bandwidth eyanelisayo i-VSWR < 1.5: 1 ngokuqhelekileyo ingaphantsi kwe-BW3dB, kwaye umlinganiselo wayo we-BW3dB unxulumene nomyalelo wokucoca kunye nokulahlekelwa kokufaka.
2. Ilahleko yokuBuyisa: Ibhekisa kumlinganiselo we-decibels (dB) wamandla egalelo kunye namandla okubonisa ezibuko lomqondiso, elikwalingana ne-|20Log10ρ|, ρis i-voltage reflection coefficient. Ilahleko yembuyekezo ayinasiphelo xa igalelo lamandla lifunxwa lizibuko.
3. Ukulahlwa kwe-Stopband: isalathisi esibalulekileyo sokulinganisa ukusebenza kokhetho lwe-RF filter. Ukuphakama kwesalathisi, kungcono ukunyanzeliswa kwesignali yokuphazamiseka kwe-out-of-band. Kudla ngokubakho iindlela ezimbini zokuqulunqa: enye kukubuza ukuba ingakanani i-dB fs ecinezelweyo kwifrikhwensi enikiweyo yangaphandle kwebhendi, kwaye indlela yokubala kukuthomalalisa i-as-il e-FS; Esinye kukucebisa isalathiso ukubonisa iqondo lokusondela phakathi kwempendulo ye-amplitude-frequency yesihluzi kunye noxande olufanelekileyo -- rectangle coefficient (KxdB > 1), KxdB=BWxdB/BW3dB, (X ingaba yi-40dB, 30dB, 20dB, njl.). Okukhona isihluzo sinazo, kokukhona sinoxande-- oko kukuthi, ngokusondeleyo u-K kwixabiso elilungileyo lika-1, kokukhona kunzima ukulenza.

 

Ewe, ngaphandle kwemiba engentla, unokuthathela ingqalelo amandla ayo okusebenza, umlinganiselo wesicelo, okanye ukusetyenziswa kwangaphakathi okanye ngaphandle, kunye nezihlanganisi. Nangona kunjalo, ezi parameters zingasentla zibaluleke kakhulu ukugqiba ukusebenza kwayo.

Njengomyili wezihluzo zeRF, iJingxin inokukunceda kumbandela wezihluzo zeRF, kwaye wenze ngokwezifiso isihluzo sokwenza ngokwesisombululo sakho. Iinkcukacha ezithe kratya zinokuboniswa nathi.