Pasina firita muRF front end, mhedzisiro yekugamuchira ichaderedzwa zvakanyanya. Dhisikaundi yakakura sei? Kazhinji, nema antenna akanaka, daro richave rakaipisisa kanenge kaviri. Zvakare, kana antenna yakakwira, kugamuchira kwacho kwakaipa! Sei zvakadaro? Nekuti denga ranhasi rakazara nemasaini akawanda, aya masaini ari kuvharira chubhu yekugamuchira yepamberi. Sezvo firita yepamberi yakakosha, ungagadzira sei firita yepamberi? Rf indasitiri mukuru wekudzidzisa iwe! Zvisinei, firita yepamberi yebhendi ye435MHz haisi nyore kuwedzera. Ngatitangei ongororo
Iyi i seti yemafirita eChebyshev band-pass ane top capacitor coupling uye centre frequency ye435MHz. Nekuda kwekushandiswa kwema chip inductors anowanikwa mumusika (ane Q value inosvika 70), kurasikirwa kweinsertion kwakakura zvikuru, kusvika -11db, uye imwe curve ndiyo reflection (inogona kushandurwa kuita mawave akamira). Saka, kunzwa kwemugamuchiri kunokanganiswa zvakanyanya, nekuti kunzwa kwemugamuchiri kwakabatana zvakananga ne noise figure yedanho rekutanga re high amplification, kunyangwe tekinoroji yacho yakanaka, senge noise figure ye high amplification inogona kudzorwa kusvika 0.5, asi kurasikirwa kwe plug ye front filter kuchawedzera noise figure ne 11db. Saka hazviwanzoitiki kuona imwe ichishandiswa seizvi. Tarisa mufananidzo uyu zvakare:
Chengetedza mamwe ma parameter, inductor inotsiviwa ne coil iri nani isina chinhu, kunyangwe vhoriyamu yakakura, asi kurasikirwa kwekuisa kunosvika -5, iyo inonyanya kushandiswa, asi ichiri kuoma kugadzira. Nekuti: Coupling capacitance iri pamusoro inongova 0.2P chete, uye capacitance yeiyi capacitance haisi nyore kutenga, saka unogona kungodhirowa capacitor paPCB, izvo zvinoita kuti pave nekuomera pakubudirira kwe1. Kunyangwe 12nH inductor haina kunaka kutenderedza, uye inofanira kunge isina chinhu uye yakabatana, uye haina kunaka kuibata kana pasina ruzivo rwakakwana. Inductance ichiri yakakura zvishoma, ma parameter ema capacitor iwayo anonyanya kunzwa, uye shanduko diki ichakanganisa mashandiro. Saka ko kana uchigona kuramba uchiwedzera Q value ye inductor, uye paine nzira yekuramba uchideredza coupling capacitance? Wobva waderedza bandwidth zvishoma. Mamiriro acho angave seanotevera:
Kukosha kweQ yeinductance yemufananidzo uyu kamwe kamwe kunosvika 1600, uye inductance inokurawo, girafu inova yakanaka kwazvo, iyi firita inogona kuve nechokwadi chekuti mugamuchiri nezvimwe zviratidzo zvinosarudzwa uye zvinonzwisisika, kana pasina kufunga nezvekushandiswa kwesimba zvakananga kumashure kwechikamu cheIC, dhonza daro kamwe kamwe kumusoro. Kushanda kuri nani, asi saizi yacho yakakura kwazvo microstrip firita
Dhizaini yefirita inotenderera inoshanda. Kune iyi firita inotenderera, vanhu vashoma vanozogadzira muChina, uye software yacho inogona kunyatsobatanidzwa zvakanaka. Kutanga, mufananidzo wekare unoburitsa firita chaiyo yefirita ye435MHz mobile devices. Kutaura zvazviri, mafirita ari nani anofanira kugadzirwa nemachina zvakanyanya, tichagadzira mafirita emhando yepamusoro e2-cavity ne4-cavity emuchina uyu wekuyedza.
Nguva yekutumira: Chikunguru-17-2024