Ngaphandle kokucoca kumphambili weRF, umphumo wokufumana uya kuncitshiswa kakhulu. Singakanani isaphulelo? Ngokubanzi, ngee-antenna ezilungileyo, umgama uya kuba ngama-2 amaxesha amabi kakhulu. Kwakhona, okukhona i-eriyali iphezulu, kokukhona ulwamkelo lubi ngakumbi! Kutheni kunjalo? Ngenxa yokuba isibhakabhaka sanamhlanje sizaliswe yimiqondiso emininzi, le miqondiso ivalela ityhubhu yokufumana ngaphambili. Kuba isihluzi sangaphambili sibaluleke kakhulu, ukwenza njani isihluzo sangaphambili? Inkosi ephezulu kwishishini leRf ukukufundisa! Nangona kunjalo, isihluzi sangaphambili sebhendi ye-435MHz akulula kangako ukongeza. Masiqale uhlalutyo
Olu luluhlu lweefilitha ze-Chebyshev band-pass kunye ne-top capacitor coupling kunye ne-frequency center ye-435MHz. Ngenxa yokusetyenziswa kwee-inductors ze-chip ezithengiswayo (ezinexabiso le-Q ukuya kwi-70), ilahleko yokufaka ikhulu kakhulu, ifikelela ku-11db, kwaye enye ijika yimbonakaliso (enokuthi iguqulwe ibe ngamaza amileyo). Ke ngoko, ubuntununtunu bomamkeli buchaphazeleka kakhulu, kuba ubuntununtunu bomamkeli bunxulumene ngokuthe ngqo nomfanekiso wengxolo wenqanaba lokuqala lokwandiswa okuphezulu, nokuba itekhnoloji ilungile, njengesandi sengxolo yokukhulisa okuphezulu kunokulawulwa. ukuya ku-0.5, kodwa ilahleko yeplagi yesihluzo sangaphambili siyakwenza mandundu inani lengxolo nge-11db. Ngoko kunqabile ukubona enye isetyenziswa ngolu hlobo. Jonga lo mfanekiso kwakhona:
Gcina ezinye iiparitha, i-inductor ithathelwa indawo yi-coil engenanto engcono, nangona umthamo ukhulu, kodwa ilahleko yokufaka iba malunga ne--5, eyona nto isetyenziswayo, kodwa kusenzima kakhulu ukwenza. Ngenxa yokuba: I-coupling capacitance phezulu yi-0.2P kuphela, kwaye i-capacitance yalo mthamo ayilula kakhulu ukuyithenga, ngoko unokuzoba kuphela i-capacitor kwi-PCB, ezisa ubunzima kwi-1 impumelelo. Nkqu ne-12nH inductor ayilunganga kakhulu ukubethwa ngumoya, kwaye kufuneka ibenomgongxo kwaye idibanise, kwaye akulunganga ukukwazi ukuba akukho mava aneleyo. I-inductance isenkulu kancinane, iiparameters zezo capacitors zibukhali, kwaye utshintsho oluncinci luya kuchaphazela ukusebenza. Ngoko kuthekani ukuba unokuqhubeka nokwandisa ixabiso le-Q le-inductor, kwaye kukho indlela yokuqhubeka nokunciphisa i-coupling capacitance? Emva koko unciphise i-bandwidth kancinane. Imeko iya kuba ngolu hlobo lulandelayo:
Ixabiso le-inductance Q yalo mzobo ngequbuliso liba yi-1600, kwaye i-inductance nayo iba nkulu, igrafu iba yintle kakhulu, esi sihluzo sinokuqinisekisa ukukhetha kunye nobuntununtunu bomamkeli kunye nezinye izalathi, ukuba akukho ngqalelo yokusetyenziswa kwamandla ngokuthe ngqo kwi. emva kweqhekeza le-IC, ngokukhawuleza tsala umgama unyuke. Ukusebenza ngcono, kodwa ubungakanani bukhulu kakhulu isihluzo semicrostrip
Uyilo olusebenzayo lwesihluzo esijikelezayo Kwesi sihluzo sijikelezayo, abantu abambalwa nabambalwa baya kuyila ngokwenene eTshayina, kwaye isoftware inokudityaniswa kakuhle. Okokuqala, umfanekiso wangaphambili wazisa esona sihluziyo sijikelezayo se-435MHz izixhobo eziphathwayo. Ngapha koko, izihluzi ezingcono kufuneka zenziwe ngokungqongqo ngakumbi, siya kuyila umgangatho ophezulu we-2-cavity kunye ne-4-cavity filters kulo matshini wokuvavanya.
Ixesha lokuposa: Jul-17-2024