Ba tare da tacewa a ƙarshen gaban RF ba, tasirin karɓa zai ragu sosai. Yaya girman rangwamen yake? Gabaɗaya, tare da eriya masu kyau, nisa zai zama aƙalla sau 2 mafi muni. Hakanan, mafi girman eriya, mafi munin liyafar! Me yasa haka? Domin sararin yau yana cike da sigina da yawa, waɗannan sigina suna toshe bututun karɓar gaba. Tunda tacewar gaba yana da mahimmanci, ta yaya za a yi matattarar gaba? Babban malamin masana'antar rf don koya muku! Koyaya, matatar gaban-ƙarshen don rukunin 435MHz ba shi da sauƙin ƙarawa. Bari mu fara bincike
Wannan saitin matattarar band-pass ne na Chebyshev tare da babban haɗin gwiwa mai ƙarfi da mitar tsakiya na 435MHz. Saboda amfani da inductor guntu na kasuwanci (wanda ke da ƙimar Q har zuwa 70), asarar shigarwar tana da girma sosai, tana kaiwa -11db, ɗayan kuma lanƙwasa shine tunani (wanda za'a iya canza shi zuwa igiyoyin ruwa na tsaye). Saboda haka, hankalin mai karɓar yana da tasiri sosai, saboda hankalin mai karɓa yana da alaƙa kai tsaye da sautin amo na matakin farko na haɓakawa, koda kuwa fasahar tana da kyau, kamar siffar amo na babban haɓakawa za a iya sarrafa shi. zuwa 0.5, amma hasarar filogi na tacewa ta gaba zai ƙara dagula adadi da 11db. Don haka da wuya ka ga ana amfani da shi kamar haka. Kalli wannan hoton kuma:
Kula da wasu sigogi, an maye gurbin inductor da inductor mafi kyawun nada, kodayake girman yana da girma, amma asarar sakawa ya zama kusan -5, wanda ake amfani da shi, amma har yanzu yana da wahala a yi. Domin: Ƙarfafawar haɗin gwiwa a saman shine kawai 0.2P, kuma ƙarfin wannan ƙarfin ba shi da sauƙin saya, don haka za ku iya zana capacitor kawai akan PCB, wanda ke kawo wahala ga nasara 1. Ko da inductor na 12nH ba shi da kyau sosai don iska, kuma dole ne ya kasance mai zurfi da tsaka-tsakin, kuma ba shi da kyau a iya ƙwarewa idan akwai ƙarancin kwarewa. Inductance har yanzu yana da ɗan girma, ma'auni na waɗannan capacitors sun fi hankali, kuma ɗan canji zai shafi aikin. Don haka menene idan zaku iya ci gaba da haɓaka ƙimar Q na inductor, kuma akwai hanyar da za ku ci gaba da rage ƙarfin haɗin gwiwa? Sa'an nan kuma rage bandwidth kadan kadan. Halin zai kasance kamar haka:
Inductance Q darajar wannan adadi ba zato ba tsammani ya zama 1600, kuma inductance kuma ya zama ya fi girma, jadawali ya zama kyakkyawa sosai, wannan tacewa zai iya tabbatar da zaɓi da kuma ji na mai karɓa da sauran alamomi, idan babu la'akari da amfani da makamashi kai tsaye a cikin baya wani yanki na IC, zazzage nisa sama. Mafi kyawun aiki, amma girman ya yi yawa babban matatar microstrip
Zane-zanen matattara mai amfani Don wannan tace mai karkace, mutane kaɗan da kaɗan ne za su ƙira da gaske a China, kuma software ɗin za ta iya haɗawa sosai. Na farko, hoton da ya gabata yana gabatar da ainihin tace karkace don na'urorin hannu na 435MHz. A zahiri, mafi kyawun tacewa dole ne a fitar da su da ƙarfi sosai, za mu ƙirƙira ingantattun ramuka 2 da matatun rami 4 don wannan injin gwaji.
Lokacin aikawa: Yuli-17-2024