Nta kayunguruzo kari imbere ya RF, ingaruka zo kwakira zizagabanuka cyane. Igabanywa ni ringana iki? Muri rusange, hamwe na antene nziza, intera izaba mbi inshuro 2. Nanone, uko antene iba nini, niko kwakira kwangirika kuba kubi! Kuki ari uko bimeze? Kubera ko ijuru ry'uyu munsi ryuzuyemo ibimenyetso byinshi, ibi bimenyetso bifunga umuyoboro w'imbere wo kwakira. Kubera ko akayunguruzo k'imbere ari ingenzi cyane, ni gute wakora akayunguruzo k'imbere? Rf umuyobozi mukuru w'inganda kugira ngo akwigishe! Ariko, akayunguruzo k'imbere k'umurongo wa 435MHz ntabwo byoroshye kongeramo. Reka dutangire isesengura
Iyi ni seti ya Chebyshev band-pass filters ifite capacitor yo hejuru hamwe n'umuvuduko wo hagati wa 435MHz. Bitewe no gukoresha chip inductors ziboneka ku isoko (zifite agaciro ka Q kagera kuri 70), igihombo cyo kwinjira ni kinini cyane, kigera kuri -11dB, kandi indi curve ni reflection (ishobora guhindurwamo imiraba ihagaze). Kubwibyo, ubushobozi bwo kwakira burahinduka cyane, kuko ubushobozi bwo kwakira burahuzwa neza n'imiterere y'urusaku rw'icyiciro cya mbere cyo kongera ingufu, nubwo ikoranabuhanga ryaba ryiza, nko kuba imiterere y'urusaku rwo kongera ingufu ishobora kugenzurwa kugeza kuri 0.5, ariko igihombo cyo gushyira ingufu mu cyuma cy'imbere mu by'ukuri kizarushaho kongera ingufu z'urusaku ho 11dB. Rero ni gake cyane kubona imwe ikoreshwa gutya. Ongera urebe iyi shusho:
Komeza ibindi bipimo, inductor isimbuzwa na coil nziza y'ubusa, nubwo ingano ari nini, ariko igihombo cyo kwinjira kiba hafi -5, gishobora gukoreshwa cyane, ariko kiracyagoye cyane gukora. Kubera ko: Capacitance yo guhuza hejuru ari 0.2P gusa, kandi capacitance y'ubu bushobozi ntabwo byoroshye cyane kuyigura, bityo ushobora gukurura capacitor kuri PCB gusa, ibyo bigatera ingorane ku ntsinzi imwe. Ndetse na inductor ya 12nH ntabwo ari nziza cyane kuyizunguza, kandi igomba kuba irimo ubusa kandi ivanze, kandi ntabwo ari byiza kuyimenya neza niba nta bunararibonye buhagije. Inductance iracyari nini gato, ibipimo by'izo capacitor birakomeye, kandi impinduka ntoya zizagira ingaruka ku mikorere. None se bite niba ushobora gukomeza kongera agaciro ka Q ka inductor, kandi hari uburyo bwo gukomeza kugabanya capacitance yo guhuza? Noneho gabanya bandwidth gato. Imiterere yaba ikurikira:
Agaciro ka Q k'iyi shusho kaba gatunguranye 1600, kandi inductance nayo irushaho kuba nini, imbonerahamwe iba nziza cyane, iyi filter ishobora kwemeza ko icyuma gifata amashusho n'ibindi bimenyetso bireba neza, niba nta ngufu zikoreshwa inyuma y'igice cya IC, hita ukuramo intera hejuru. Imikorere myiza, ariko ingano ni nini cyane.
Igishushanyo mbonera cy’urufunguzo rw’uruziga Kuri iyi filter y’uruziga, abantu bake bazayishushanya mu Bushinwa, kandi porogaramu ishobora guhuzwa neza. Ubwa mbere, ifoto ibanza yerekana filter nyayo y’uruziga rw’uruziga rw’ibikoresho bigendanwa bya 435MHz. Mu by’ukuri, filter nziza zigomba gukorwa neza cyane, tuzashushanya filter nziza zifite ubugari bubiri n’ubugari bune kuri iyi mashini igerageza.
Igihe cyo kohereza: Nyakanga-17-2024