1. Ribar eriya
Eriyariba yana nufin rabon yawan ƙarfin radiation na eriya a wani takamaiman alkibla zuwa yawan ƙarfin radiation na eriya mai tunani (yawanci tushen wurin radiation mai kyau) a cikin ƙarfin shigarwa iri ɗaya. Sigogi waɗanda ke wakiltar ribar eriya sune dBd da dBi.
Za a iya fahimtar ma'anar riba ta zahiri kamar haka: don samar da sigina na wani girma a wani wuri a wani nisa, idan aka yi amfani da tushen wurin da ba na alkibla ba a matsayin eriya mai watsawa, ana buƙatar ƙarfin shigarwa na 100W, yayin da lokacin da aka yi amfani da eriya mai jagora tare da riba na G=13dB (sau 20) a matsayin eriya mai watsawa, ƙarfin shigarwa shine 100/20=5W kawai. A wata ma'anar, ribar eriya, dangane da tasirin radiation a cikin mafi girman alkiblar radiation, shine ninki na ƙarfin shigarwa da aka ƙara idan aka kwatanta da tushen wurin da ba na alkibla ba.
Ana amfani da ribar eriya don auna ikon eriya na aika da karɓar sigina a wani takamaiman alkibla kuma yana ɗaya daga cikin mahimman sigogi don zaɓar eriya. Ribar tana da alaƙa da tsarin eriya. Mafi girman kunkuntar babban lobe na tsarin da ƙaramin lobe na gefe, mafi girman ribar. An nuna alaƙar da ke tsakanin faɗin babban lobe da ribar eriya a Hoto na 1-1.
Siffa ta 1-1
A ƙarƙashin irin wannan yanayi, mafi girman ribar, haka nan kuma yadda rediyo ke yaɗuwa. Duk da haka, a zahirin aiwatarwa, ya kamata a zaɓi ribar eriya bisa ga daidaiton hasken da yankin da aka nufa. Misali, lokacin da nisan rufewa ya kusa, domin tabbatar da tasirin rufewa na wurin kusa, ya kamata a zaɓi eriya mai ƙarancin riba tare da faɗin lobe a tsaye.
2. Ra'ayoyi masu alaƙa
·dBd: dangane da ribar eriya mai tsari mai daidaito,
·dBi: idan aka kwatanta da ribar eriya mai tushe, hasken da ke cikin dukkan kwatance iri ɗaya ne. dBi=dBd+2.15
Kusurwar lobe: kusurwar da aka samar ta hanyar 3dB a ƙasa da babban kololuwar lobe a cikin tsarin eriya, don Allah a duba faɗin lobe don ƙarin bayani, tushen wurin radiation mai kyau: yana nufin eriya mai isotropic mai kyau, wato, tushen hasken haske mai sauƙi, tare da halaye iri ɗaya na radiation a duk hanyoyi a sararin samaniya.
3. Tsarin lissafi
Ribar eriya = 10lg (yawan ƙarfin eriya/yawan ƙarfin eriya)
Don ƙarin koyo game da eriya, da fatan za a ziyarci:
Lokacin Saƙo: Disamba-06-2024
