Zosefera za Passive Band Passzitha kupangidwa mwa kulumikiza pamodzi fyuluta yotsika yotsika yokhala ndi fyuluta yayikulu
Zosefera za Passive Band Pass zitha kugwiritsidwa ntchito kudzipatula kapena kusefa ma frequency ena omwe ali mkati mwa gulu linalake kapena ma frequency angapo. Mafupipafupi odulidwa kapena ƒc point mu sefa yosavuta ya RC passive imatha kuwongoleredwa molondola pogwiritsa ntchito chopinga chimodzi chokha pamndandanda wokhala ndi capacitor yopanda polarized, ndipo kutengera momwe amalumikizirana, tawona kuti mwina Low Pass kapena High Pass fyuluta yapezedwa.
Kugwiritsiridwa ntchito kumodzi kosavuta kwa mitundu iyi ya zosefera kungokhala pamawu omvera amplifier kapena mabwalo monga muzosefera zophatikizira zokuzira mawu kapena zowongolera mamvekedwe a pre-amplifier. Nthawi zina pamafunika kungodutsa ma frequency angapo omwe samayambira pa 0Hz, (DC) kapena kutha pamlingo wina wapamwamba kwambiri koma amakhala mkati mwamtundu wina kapena gulu la ma frequency, kaya opapatiza kapena otambalala.
Mwa kulumikiza kapena "kuthamanga" palimodzi kagawo kakang'ono ka Low Pass Filter ndi dera la High Pass Filter, tikhoza kupanga mtundu wina wa fyuluta ya RC yomwe imadutsa mulingo wosankhidwa kapena "gulu" la ma frequency omwe angakhale opapatiza kapena otambasuka pamene akuchepetsa onse omwe ali kunja kwa izi. Mtundu watsopanowu wa zosefera zopanda pake zimapanga fyuluta yosankhika pafupipafupi yomwe imadziwika kuti Band Pass Filter kapena BPF mwachidule.
Mosiyana ndi zosefera zotsika zomwe zimangodutsa ma frequency otsika kapena fyuluta yapamwamba yomwe imadutsa ma frequency apamwamba, Zosefera za Band Pass zimadutsa ma siginecha mkati mwa "gulu" kapena "kufalikira" kwa ma frequency popanda kupotoza chizindikiro cholowera kapena kubweretsa phokoso lowonjezera. Gulu la ma frequency amtunduwu limatha kukhala m'lifupi lililonse ndipo limadziwika kuti Sefa Bandwidth.
Bandwidth nthawi zambiri imatanthauzidwa ngati kuchuluka kwafupipafupi komwe kumakhalapo pakati pa magawo awiri odulira pafupipafupi ( ƒc ), omwe ali 3dB pansi pakatikati pakatikati kapena nsonga ya resonant pomwe mukuchepetsa kapena kufooketsa ena kunja kwa mfundo ziwirizi.
Ndiye chifukwa cha maulendo ofalikira kwambiri, tikhoza kufotokozera mawu akuti "bandwidth", BW monga kusiyana pakati pa maulendo otsika otsika (ƒcLOWER) ndi maulendo apamwamba odulidwa (ƒcHIGHER) mfundo. Mwa kuyankhula kwina, BW = ƒH - ƒL. Mwachiwonekere kuti fyuluta ya pass band igwire bwino ntchito, kudulidwa kwafupipafupi kwa fyuluta yotsika kuyenera kukhala yokwera kuposa mafupipafupi odulidwa a fyuluta yapamwamba.
Zosefera "zabwino" Band Pass zitha kugwiritsidwanso ntchito kudzipatula kapena kusefa ma frequency ena omwe ali mkati mwa gulu linalake la ma frequency, mwachitsanzo, kuletsa phokoso. Zosefera za band pass zimadziwika kuti zosefera zachiwiri, (zambiri) chifukwa zili ndi "ziwiri" zogwira ntchito, ma capacitor, mkati mwa mapangidwe awo. Mmodzi capacitor mu low pass circuit ndi capacitor wina mu high pass circuit.
Bode Plot kapena ma frequency reaction curve pamwambapa amawonetsa mawonekedwe a band pass fyuluta. Apa chizindikirocho chimachepetsedwa pang'onopang'ono ndipo zotuluka zikuchulukira pamtunda wa +20dB/Decade (6dB/Octave) mpaka ma frequencywo afika "pamunsi odulidwa" ƒL. Pafupipafupi voteji yotulutsa imakhalanso 1/√2 = 70.7% ya mtengo wa siginecha kapena -3dB (20* log(VOUT/VIN)) yolowera.
Zomwe zimatuluka zimapitilira kupindula kwakukulu mpaka kukafika pa "chodula chapamwamba" ƒH pomwe zotulutsa zimachepa pamlingo wa -20dB/Decade (6dB/Octave) ndikuchepetsa ma siginecha aliwonse apamwamba. Mfundo yopezera phindu lalikulu nthawi zambiri imakhala tanthauzo la geometric la mtengo wa -3dB pakati pa malo odulidwa otsika ndi apamwamba ndipo amatchedwa "Centre Frequency" kapena "Resonant Peak" mtengo ƒr. Tanthauzo la geometric imeneyi imawerengedwa ngati ƒr 2 = ƒ(UPPER) x ƒ(KUSI).
Aband pass fyulutaimatengedwa ngati fyuluta yamtundu wachiwiri (pazambiri-zambiri) chifukwa ili ndi zigawo "ziwiri" zogwira ntchito mkati mwa kayendedwe kake, ndiye kuti mbali yake imakhala yowirikiza kawiri ya zosefera zomwe zidawoneka poyamba, mwachitsanzo, 180o. Mbali yotulutsa chizindikiro imatsogolera ku +90o mpaka pakati kapena ma frequency a resonant, ƒr point ikadakhala madigiri "zero" (0o) kapena "mugawo" kenako ndikusintha kukhala LAG zolowetsa ndi -90o pomwe ma frequency akuchulukira.
Kumtunda ndi m'munsi odulidwa-odulira pafupipafupi mfundo fyuluta gulu chiphaso angapezeke ntchito chilinganizo chimodzimodzi ndi kuti onse otsika ndi mkulu passfilter, Mwachitsanzo.
Mayunitsi amabwera muyezo wokhala ndi zolumikizira za SMA kapena N zazikazi, kapena 2.92mm, 2.40mm, ndi zolumikizira za 1.85mm pazigawo zapamwamba kwambiri.
Tithanso kusintha Sefa ya Band Pass malinga ndi zomwe mukufuna. Mutha kulowa patsamba losintha kuti mupereke zomwe mukufuna.
Nthawi yotumiza: Sep-06-2022
