Ngaphandle kwesihluzo kwicala elingaphambili le-RF, isiphumo sokwamkela siya kuncipha kakhulu. Ingakanani isaphulelo? Ngokubanzi, ngee-antenna ezilungileyo, umgama uya kuba mbi ngokuphindwe kabini. Kwakhona, okukhona i-antenna iphezulu, kokukhona i-reception imbi! Kutheni kunjalo? Ngenxa yokuba isibhakabhaka sanamhlanje sizaliswe ziimpawu ezininzi, ezi zibonakaliso zivimba ityhubhu yokwamkela engaphambili. Ekubeni isihluzo esingaphambili sibaluleke kangaka, ungayenza njani isihluzo esingaphambili? Ingcali ephezulu kushishino lwe-Rf ukukufundisa! Nangona kunjalo, isihluzo esingaphambili sebhendi ye-435MHz akulula ukusongeza. Masiqale uhlalutyo
Le yiseti yezihluzi zebhendi zeChebyshev ezine-capacitor coupling ephezulu kunye ne-center frequency ye-435MHz. Ngenxa yokusetyenziswa kwee-chip inductors ezithengiswayo (ezinexabiso le-Q ukuya kuthi ga kwi-70), ilahleko yokufakwa inkulu kakhulu, ifikelela kwi--11db, kwaye enye i-curve yi-reflection (enokuguqulelwa kumaza amiyo). Ke ngoko, uvakalelo lwe-receiver luchaphazeleka kakhulu, kuba uvakalelo lwe-receiver lunxulumene ngokuthe ngqo nomfanekiso wengxolo wesigaba sokuqala sokwandiswa okuphezulu, nokuba ubuchwepheshe bulungile, njengokuthi umfanekiso wengxolo wokwandiswa okuphezulu unokulawulwa ukuya kwi-0.5, kodwa ukulahleka kweplagi ye-front filter kuya kwenza umfanekiso wengxolo ube mandundu nge-11db. Ngoko ke kunqabile ukubona enye isetyenziswa ngolu hlobo. Jonga lo mfanekiso kwakhona:
Gcina ezinye iiparameter, i-inductor ithathelwa indawo yi-hollow coil engcono, nangona ivolumu inkulu, kodwa ilahleko yokufakwa iba malunga ne--5, esetyenziswa ngokusisiseko, kodwa kusenzima kakhulu ukuyenza. Kuba: I-coupling capacitance ephezulu yi-0.2P kuphela, kwaye i-capacitance yale capacity akulula ukuyithenga, ngoko unokutsala kuphela i-capacitor kwi-PCB, nto leyo ebangela ubunzima kwimpumelelo enye. Kwane-12nH inductor ayilungile kakhulu ukuyifutha, kwaye kufuneka ibe yi-hollow kwaye idibane, kwaye ayilungile ukuyilawula ukuba akukho namava aneleyo. I-inductance isenkulu kancinci, iiparameters zezo capacitors zinobuthathaka ngakumbi, kwaye utshintsho oluncinci luya kuchaphazela ukusebenza. Kuthekani ke ukuba ungaqhubeka nokunyusa ixabiso le-Q le-inductor, kwaye kukho indlela yokuqhubeka nokunciphisa i-coupling capacitance? Emva koko nciphisa i-bandwidth kancinci. Imeko iya kuba ngolu hlobo lulandelayo:
Ixabiso le-inductance Q yalo mfanekiso ngequbuliso liba yi-1600, kwaye i-inductance nayo iba nkulu, igrafu iba ntle kakhulu, esi sihluzo sinokuqinisekisa ukukhetha kunye nobuntununtunu bomamkeli kunye nezinye izalathisi, ukuba akukho kuqwalaselwa kokusetyenziswa kwamandla ngqo ngasemva kweqhekeza le-IC, ngequbuliso tsala umgama phezulu. Ukusebenza ngcono, kodwa ubungakanani bukhulu kakhulu isihluzo se-microstrip
Uyilo olusebenzayo lwe-spiral filter Kule spiral filter, abantu abambalwa baya kuyila eTshayina, kwaye isoftware inokuhlanganiswa kakuhle. Okokuqala, umfanekiso odlulileyo uzisa i-spiral filter yokwenyani yezixhobo eziphathwayo ze-435MHz. Enyanisweni, izihluzo ezingcono kufuneka zenziwe ngomatshini ngokungqongqo, siza kuyila izihluzo ze-2-cavity kunye ne-4-cavity ezikumgangatho ophezulu zale matshini yovavanyo.
Ixesha leposi: Julayi-17-2024