Bandwidth wani muhimmin siga ne na eriya. Bandwidth yana bayyana kewayon mitar da eriya za ta iya haskakawa ko karɓar kuzari daidai. Yawanci, bandwidth da ake buƙata yana ɗaya daga cikin sigogin da ake amfani da su don zaɓar nau'in eriya. Misali, akwai nau'ikan eriya da yawa waɗanda ke da ƙananan bandwidth. Ba za a iya amfani da waɗannan eriya a aikace-aikacen broadband ba.
Yawanci ana ambaton girman bandwidth dangane da rabon ƙarfin lantarki na tsaye (VSWR). Misali, ana iya siffanta eriya da cewa tana da VSWR <1.5 akan 100-400 MHz. Bayanin ya bayyana cewa ma'aunin nuni bai wuce 0.2 ba a cikin kewayon mitar da aka ambata. Saboda haka, na ƙarfin da aka isar wa eriya, kashi 4% ne kawai na wutar da aka mayar da ita ga mai watsawa. Bugu da ƙari, asarar dawowa S11 = 20* LOG10 (0.2) = decibels 13.98.
Lura cewa abin da ke sama ba yana nufin cewa kashi 96% na wutar lantarki ana isar da shi zuwa eriya ta hanyar amfani da hasken lantarki mai yaduwa ba. Dole ne a yi la'akari da asarar wutar lantarki.
Bugu da ƙari, tsarin hasken zai bambanta dangane da mita. Gabaɗaya, siffar tsarin hasken ba ta canza mita sosai ba.
Akwai kuma wasu ƙa'idodi da ake amfani da su don bayyana bandwidth. Wannan na iya zama polarizing a cikin wani takamaiman kewayon. Misali, ana iya siffanta eriya mai zagaye polarized a matsayin tana da rabon axial na <3 dB daga 1.4-1.6 GHz (ƙasa da 3 dB). Wannan kewayon saitin bandwidth polarization yana kusan don eriya mai zagaye polarized.
Sau da yawa ana ƙayyade girman bandwidth a cikin Fractional Bandwidth (FBW). FBW shine rabon kewayon mitar da aka raba ta hanyar mitar tsakiya (mafi girman mitar da aka rage mafi ƙarancin mita). "Q" na eriya kuma yana da alaƙa da bandwidth (mafi girma Q yana nufin ƙananan bandwidth da akasin haka).
Domin bayar da wasu misalan takamaiman bandwidth, ga teburin bandwidth don nau'ikan eriya gama gari. Wannan zai amsa tambayoyin, "Menene bandwidth na eriya dipole?" da "Wace eriya ce ke da bandwidth mafi girma - faci ko eriya helix?". Don kwatantawa, muna da eriya masu mitar tsakiya na 1 GHz (gigahertz) kowannensu.
Bandwidth na eriya da yawa da aka saba amfani da su.
Kamar yadda kake gani daga teburin, girman eriya na iya bambanta sosai. Eriya masu faci (microstrip) suna da ƙarancin bandwidth, yayin da eriya masu helical suna da babban bandwidth.
Lokacin Saƙo: Nuwamba-24-2023
