Ukusebenza kwe-antenna ye-GPS
Siyazi ukuthi i-GPS locator iyitheminali yokuma noma ukuzulazula ngokwamukela amasignali esathelayithi.Enqubweni yokwamukela amasignali, kufanele kusetshenziswe uthi, ngakho-ke uluthi olwamukela isignali silubiza ngokuthi uthi lwe-GPS.Amasiginali wesathelayithi ye-GPS ahlukaniswe abe yi-L1 ne-L2, namafrikhwensi angu-1575.42MHZ no-1228MHZ ngokulandelana, phakathi kwawo i-L1 iyisiginali yomphakathi evulekile ene-polarization eyindilinga.Amandla esiginali acishe abe ngu-166-DBM, okuyisignali ebuthakathaka uma kuqhathaniswa.Lezi zici zinquma ukuthi izimpondo ezikhethekile kufanele zilungiselelwe ukwamukela amasignali e-GPS.
1. Ishidi le-Ceramic: Ikhwalithi ye-ceramic powder kanye nenqubo ye-sintering ithinta ngokuqondile ukusebenza kwayo.Amashidi e-ceramic okwamanje asetshenziswa emakethe ngokuyinhloko yi-25×25, 18×18, 15×15 kanye ne-12×12.Lapho indawo yeshidi le-ceramic ibe nkulu, i-dielectric constant iba nkulu, iyanda imvamisa ye-resonance, kanye nomphumela wokwamukela ungcono.Izingcezu eziningi ze-ceramic ziwumklamo oyisikwele, ukuze kuqinisekiswe ukuthi i-resonance ekuqondeni kwe-XY iyafana ngokuyisisekelo, ukuze kuzuzwe umphumela wokuqoqwa kwenkanyezi efanayo.
2. Ungqimba lwesiliva: Ungqimba oluyisiliva olungaphezulu kwe-antenna ye-ceramic lungathinta imvamisa yokukhala kwe-antenna.Indawo ekahle yokuvama kwe-GPS ceramic chip iwela ku-1575.42MHz, kodwa iphoyinti lokuvama kothi lithinteka kalula endaweni ezungezile, ikakhulukazi uma ihlanganiswe kuwo wonke umshini, iphoyinti lemvamisa kufanele lilungiswe ukuze lihlale liku-antenna. 1575.42MHz ngokulungisa umumo we-coating surface yesiliva..Ngakho-ke, abakhiqizi bemishini ephelele ye-GPS kufanele babambisane nabakhiqizi bezinti lapho bethenga izinti futhi banikeze amasampula omshini aphelele ukuze ahlolwe.
3. Iphoyinti lokuphakelayo: I-antenna ye-ceramic iqoqa isignali ye-resonance endaweni yokuphakelayo bese iyithumela ekugcineni okungemuva.Ngenxa yokumadanisa kwe-antenna, iphoyinti lokuphakelayo ngokuvamile alikho enkabeni ye-antenna, kodwa lilungiswe kancane liqonde ku-XY.Indlela enjalo yokufanisa i-impedance ilula futhi ayifaki izindleko.Ukuhamba ku-eksisi eyodwa kuphela kubizwa ngokuthi i-single-bias antenna, futhi ukuhamba kuzo zombili izimbazo kubizwa ngokuthi i-double-bias.
4. Isekhethi yokukhulisa: umumo nendawo ye-PCB ephethe uthi lwe-ceramic.Ngenxa yezici ze-GPS rebound, lapho ingemuva lingu-7cm × 7cm I-antenna ye-GPS inezinhlaka ezine ezibalulekile: inzuzo (Gain), igagasi elimile (VSWR), isibalo somsindo (Isibalo somsindo), isilinganiso se-axial (i-Axial ratio).Phakathi kwabo, isilinganiso se-axial sigcizelelwa ikakhulukazi, okuyinkomba ebalulekile yokulinganisa umehluko wenzuzo yesignali yomshini wonke ngezindlela ezahlukene.Njengoba amasathelayithi asatshalaliswa ngokungahleliwe esibhakabhakeni esiyi-hemispherical, kubaluleke kakhulu ukuqinisekisa ukuthi izimpondo zinokuzwela okufanayo kuzo zonke izinhlangothi.I-axial ratio ithintwa ukusebenza kwe-antenna, ukwakheka kokubukeka, ukujikeleza kwangaphakathi kanye ne-EMI yawo wonke umshini.
Isikhathi sokuthumela: Oct-20-2022
