Idan babu matattara a ƙarshen gaban RF, tasirin karɓa zai ragu sosai. Yaya girman rangwamen yake? Gabaɗaya, tare da ingantattun eriya, nisan zai fi muni aƙalla sau 2. Haka kuma, mafi girman eriya, mafi muni ga karɓar! Me yasa hakan? Domin sararin samaniya na yau yana cike da sigina da yawa, waɗannan sigina suna toshe bututun karɓa na gaba. Tunda matattara ta gaba tana da mahimmanci, ta yaya ake yin matattara ta gaba? Babban malamin masana'antar Rf don koya muku! Duk da haka, matattara ta gaba don ƙungiyar 435MHz ba ta da sauƙin ƙarawa. Bari mu fara nazarin.
Wannan saitin matatun Chebyshev ne na matatun band-pass tare da haɗin capacitor na sama da kuma mitar tsakiya na 435MHz. Saboda amfani da inductors na guntu da ake samu a kasuwa (waɗanda ke da ƙimar Q har zuwa 70), asarar shigarwar tana da girma sosai, tana kaiwa -11db, ɗayan kuma lanƙwasa shine nuni (wanda za'a iya canza shi zuwa raƙuman ruwa masu tsayawa). Saboda haka, ƙarfin mai karɓar yana da matuƙar tasiri, saboda ƙarfin mai karɓar yana da alaƙa kai tsaye da ƙarfin hayaniyar matakin farko na babban haɓaka, koda kuwa fasahar tana da kyau, kamar ƙarfin hayaniyar babban haɓaka za a iya sarrafa ta zuwa 0.5, amma asarar toshewar matatar gaba za ta ƙara ta'azzara ƙarfin hayaniyar da 11db. Don haka ba kasafai ake ganin wanda aka yi amfani da shi kamar haka ba. Duba wannan hoton kuma:
Kula da wasu sigogi, ana maye gurbin inductor da mafi kyawun coil mai rami, kodayake girman yana da girma, amma asarar shigarwar ta zama kusan -5, wanda a zahiri ana iya amfani da shi, amma har yanzu yana da matuƙar wahala a yi. Domin: Capacitance ɗin haɗin gwiwa a saman shine 0.2P kawai, kuma capacitance na wannan ƙarfin ba shi da sauƙin siya, don haka zaka iya zana capacitor kawai akan PCB, wanda ke kawo wahala ga nasara 1. Ko da inductor na 12nH ba shi da kyau don iska, kuma dole ne ya kasance rami kuma yana da alaƙa, kuma ba shi da kyau a ƙware idan babu isasshen ƙwarewa. Induction ɗin har yanzu yana da ɗan girma, sigogin waɗannan capacitors sun fi saurin amsawa, kuma ɗan canji zai shafi aikin. To me zai faru idan za ka iya ci gaba da ƙara ƙimar Q na inductor, kuma akwai hanyar ci gaba da rage capacitance ɗin haɗin gwiwa? Sannan rage bandwidth kaɗan. Yanayin zai kasance kamar haka:
Ƙimar Q ta wannan adadi ta inductance ta zama ba zato ba tsammani 1600, kuma inductance ɗin ya zama mafi girma, jadawalin ya zama kyakkyawa sosai, wannan matattarar za ta iya tabbatar da zaɓin da kuma jin daɗin mai karɓa da sauran alamomi, idan babu la'akari da yawan amfani da makamashi kai tsaye a bayan wani yanki na IC, ba zato ba tsammani ta jawo nesa sama. Ingancin aiki, amma girman ya yi yawa. Matattarar microstrip ta yi girma sosai.
Tsarin matattarar karkace mai amfani Ga wannan matattarar karkace, ƙalilan mutane za su yi ƙira a China, kuma za a iya haɗa manhajar sosai. Da farko, hoton da ya gabata ya gabatar da matattarar karkace ta ainihin na'urorin hannu na 435MHz. A zahiri, dole ne a yi matattarar mafi kyau sosai, za mu tsara matattarar rami mai inganci 2 da rami mai 4 don wannan injin gwaji.
Lokacin Saƙo: Yuli-17-2024