Popanda fyuluta kutsogolo kwa RF, zotsatira zolandirira zidzachepa kwambiri. Kodi kuchotserako ndi kwakukulu bwanji? Kawirikawiri, ndi ma antenna abwino, mtunda udzakhala woipa kawiri. Komanso, antenna ikakwera, kulandirako kumakhala koipa kwambiri! Chifukwa chiyani zili choncho? Chifukwa thambo lamakono lili ndi zizindikiro zambiri, zizindikirozi zikutseka chubu cholandirira kutsogolo. Popeza fyuluta yakutsogolo ndi yofunika kwambiri, mungapange bwanji fyuluta yakutsogolo? Rf mkulu wamakampani kuti akuphunzitseni! Komabe, fyuluta yakutsogolo ya gulu la 435MHz sikophweka kuwonjezera. Tiyeni tiyambe kusanthula
Iyi ndi seti ya zosefera za Chebyshev band-pass zokhala ndi cholumikizira chapamwamba cha capacitor komanso pafupipafupi yapakati pa 435MHz. Chifukwa chogwiritsa ntchito ma chip inductors omwe amapezeka pamsika (omwe ali ndi Q value mpaka 70), kutayika kwa insertion kumakhala kwakukulu kwambiri, kufika pa -11db, ndipo curve ina ndi reflection (yomwe ingasinthidwe kukhala mafunde oyima). Chifukwa chake, kukhudzidwa kwa wolandila kumakhudzidwa kwambiri, chifukwa kukhudzidwa kwa wolandila kumakhudzana mwachindunji ndi phokoso la gawo loyamba la kukwezedwa kwakukulu, ngakhale ukadaulo uli wabwino, monga phokoso la kukwezedwa kwakukulu likhoza kulamulidwa mpaka 0.5, koma kutayika kwa pulagi ya fyuluta yakutsogolo kudzawonjezera phokoso ndi 11db. Chifukwa chake ndizosowa kuwona imodzi ikugwiritsidwa ntchito motere. Yang'anani chithunzichi kachiwiri:
Sungani magawo ena, inductor imasinthidwa ndi coil yabwino yopanda kanthu, ngakhale voliyumu yake ndi yayikulu, koma kutayika kwa insertion kumakhala pafupifupi -5, komwe kungagwiritsidwe ntchito kwenikweni, koma kumakhala kovuta kwambiri kupanga. Chifukwa: Capacitance yolumikizira pamwamba ndi 0.2P yokha, ndipo capacitance ya mphamvu iyi si yosavuta kugula, kotero mutha kungojambula capacitor pa PCB, zomwe zimapangitsa kuti pakhale zovuta kuti 1 ipambane. Ngakhale inductor ya 12nH si yabwino kwambiri kuyiyendetsa, ndipo iyenera kukhala yopanda kanthu komanso yolumikizana, ndipo si bwino kuigwiritsa ntchito ngati palibe chidziwitso chokwanira. Inductance ikadali yayikulu pang'ono, magawo a ma capacitor amenewo ndi osavuta kumva, ndipo kusintha pang'ono kudzakhudza magwiridwe antchito. Nanga bwanji ngati mungapitirize kuwonjezera mtengo wa Q wa inductor, ndipo pali njira yopitirizira kuchepetsa capacitance yolumikizira? Kenako chepetsani bandwidth pang'ono. Mkhalidwe ungakhale motere:
Mtengo wa Q wa inductance wa chithunzichi mwadzidzidzi umakhala 1600, ndipo inductance imakulanso, graph imakhala yokongola kwambiri, fyuluta iyi imatha kutsimikizira kusankha ndi kukhudzidwa kwa wolandila ndi zizindikiro zina, ngati palibe kuganizira za kugwiritsa ntchito mphamvu mwachindunji kumbuyo kwa chidutswa cha IC, mwadzidzidzi kokerani mtunda mmwamba. Kuchita bwino, koma kukula kwake ndi kwakukulu kwambiri fyuluta ya microstrip
Kapangidwe kothandiza ka fyuluta yozungulira. Pa fyuluta yozungulira iyi, anthu ochepa adzapangadi ku China, ndipo pulogalamuyo imatha kulumikizidwa bwino. Choyamba, chithunzi cham'mbuyomu chikuwonetsa fyuluta yeniyeni yozungulira ya mafoni a 435MHz. Ndipotu, mafyuluta abwino ayenera kupangidwa mosamala kwambiri, tidzapanga mafyuluta apamwamba kwambiri a 2-cavity ndi 4-cavity a makina oyesera awa.
Nthawi yotumizira: Julayi-17-2024