Popanda fyuluta kutsogolo kwa RF, zotsatira zolandira zidzachepetsedwa kwambiri. Kodi kuchotserako ndi kwakukulu bwanji? Nthawi zambiri, ndi tinyanga zabwino, mtunda udzakhala osachepera 2 nthawi. Komanso, mlongoti wapamwamba kwambiri, kulandila koyipitsitsa! Ndichoncho chifukwa chiyani? Chifukwa thambo lamasiku ano ladzaza ndi zizindikiro zambiri, zizindikirozi zikutsekereza chubu cholandira kutsogolo. Popeza fyuluta yakutsogolo ndiyofunikira kwambiri, mungapangire bwanji fyuluta yakutsogolo? Rf industry senior master kuti akuphunzitseni! Komabe, fyuluta yakutsogolo ya gulu la 435MHz siyosavuta kuwonjezera. Tiyeni tiyambe kusanthula
Izi ndi seti ya Chebyshev band-pass zosefera ndi pamwamba capacitor coupling ndi pakati pafupipafupi 435MHz. Chifukwa cha kugwiritsidwa ntchito kwa ma chip inductors omwe amapezeka pamalonda (omwe ali ndi mtengo wa Q mpaka 70), kutayika koyikirako kumakhala kwakukulu kwambiri, kufika -11db, ndipo mphira winayo ndi chiwonetsero (chomwe chitha kusinthidwa kukhala mafunde oyimirira). Chifukwa chake, chidwi cha wolandila chimakhudzidwa kwambiri, chifukwa kukhudzika kwa wolandila kumagwirizana mwachindunji ndi chithunzi chaphokoso cha gawo loyamba la kukulitsa kwakukulu, ngakhale ukadaulo uli wabwino, monga chithunzi chaphokoso cha kukulitsa kwakukulu kumatha kuyendetsedwa. mpaka 0.5, koma kutayika kwa pulagi kwa fyuluta yakutsogolo kumawonjezera phokoso la 11db. Kotero ndizosowa kuwona wina akugwiritsidwa ntchito motere. Onaninso chithunzi ichi:
Pitirizani magawo ena, inductor m'malo bwino dzenje koyilo, ngakhale kuti voliyumu ndi lalikulu, koma kutayika kulowetsedwa kumakhala pafupifupi -5, zomwe zingagwiritsidwe ntchito, koma zimakhala zovuta kwambiri kupanga. Chifukwa: The coupling capacitance pamwamba ndi 0.2P yekha, ndipo capacitance ya mphamvu imeneyi si yosavuta kugula, kotero inu mukhoza kujambula capacitor pa PCB, zomwe zimabweretsa zovuta 1 kupambana. Ngakhale cholumikizira cha 12nH sichabwino kwambiri pakuwomba, ndipo chiyenera kukhala chopanda kanthu komanso cholumikizirana, ndipo sichabwino kudziwa ngati palibe chidziwitso chokwanira. Inductance ikadali yayikulu pang'ono, magawo a ma capacitor amenewo amakhala okhudzidwa kwambiri, ndipo kusintha pang'ono kumakhudza magwiridwe antchito. Nanga bwanji ngati mungapitirize kuonjezera mtengo wa Q wa inductor, ndipo pali njira yopitirizira kuchepetsa mphamvu yogwirizanitsa? Kenako chepetsani bandwidth pang'ono. Zinthu zikhala motere:
Mtengo wa inductance Q wa chiwerengerochi mwadzidzidzi umakhala 1600, ndipo inductance imakhalanso yokulirapo, graph imakhala yokongola kwambiri, fyuluta iyi ikhoza kutsimikizira kusankhidwa ndi kukhudzidwa kwa wolandira ndi zizindikiro zina, ngati palibe kulingalira kwa kugwiritsa ntchito mphamvu mwachindunji mu kumbuyo kwa chidutswa cha IC, mwadzidzidzi kukokera mtunda mmwamba. Kuchita bwino, koma kukula kwake ndi fyuluta yayikulu kwambiri ya microstrip
Kapangidwe kabwino ka spiral fyuluta Pazosefera zozungulira izi, anthu ochepa ndi ochepa adzapangadi ku China, ndipo pulogalamuyo imatha kuphatikizidwa bwino. Choyamba, chithunzi cham'mbuyomu chikuwonetsa zosefera zenizeni za 435MHz zam'manja. M'malo mwake, zosefera zabwinoko ziyenera kupangidwa mosamalitsa, tidzapanga zosefera zapamwamba za 2-cavity ndi 4-cavity pamakinawa.
Nthawi yotumiza: Jul-17-2024