Bandwidth wani muhimmin ma'aunin eriya ne. Bandwidth yana bayyana kewayon mitoci waɗanda eriyar zata iya haskakawa daidai ko karɓar kuzari. Yawanci, bandwidth ɗin 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 tare da ƙananan bandwidth. Ba za a iya amfani da waɗannan eriya a aikace-aikacen watsa labarai ba.
Yawanci ana nakalto bandwidth dangane da ma'aunin tsayayyen igiyoyin wuta (VSWR). Misali, ana iya siffanta eriya da samun VSWR <1.5 sama da 100-400 MHz. Bayanin ya nuna cewa ƙimar tunani bai kai 0.2 a cikin kewayon mitar da aka ambata ba. Don haka, na ikon da aka bayar ga eriya, kashi 4% kawai na wutar lantarki ke nunawa ga mai watsawa. Bugu da ƙari, dawowar asarar S11 = 20 * LOG10 (0.2) = 13.98 decibels.
Lura cewa abin da ke sama baya nufin cewa ana isar da 96% na wutar zuwa eriya a cikin nau'in radiation na lantarki mai yaɗawa. Dole ne a yi la'akari da asarar wutar lantarki.
Bugu da ƙari, tsarin radiation zai bambanta da mita. Gabaɗaya, siffar ƙirar radiation ba ta canza mitar sosai ba.
Hakanan ana iya samun wasu ma'auni da aka yi amfani da su don bayyana bandwidth. Wannan na iya zama polarizing a cikin takamaiman kewayon. Misali, ana iya siffanta eriya mai madauwari da'ira da samun ma'aunin axial na <3 dB daga 1.4-1.6 GHz (kasa da 3 dB). Wannan kewayon saitin bandwidth na polarization yana kusan don eriya masu da'ira.
Sau da yawa ana ƙayyadadden bandwidth a cikin Rarraba Bandwidth (FBW). FBW shine rabon kewayon mitar da aka raba ta tsakiyar mitar (mafi girman mitar da aka cire mafi ƙarancin mitar). Hakanan "Q" na eriya yana da alaƙa da bandwidth (mafi girma Q yana nufin ƙananan bandwidth da akasin haka).
Don ba da wasu takamaiman misalai na bandwidth, ga tebur na bandwidth don nau'ikan eriya gama gari. Wannan zai amsa tambayoyin, "Menene bandwidth na eriyar dipole?" da kuma "Wane eriya yana da babban bandwidth - faci ko eriyar helix?". Don kwatantawa, muna da eriya masu matsakaicin mitar 1 GHz (gigahertz) kowanne.
Bandwidths na eriya gama gari da yawa.
Kamar yadda kuke gani daga tebur, bandwidth na eriya na iya bambanta sosai. Eriya na faci (microstrip) ba su da ƙarfi sosai, yayin da eriya masu ɗimbin yawa suna da babban bandwidth.
Lokacin aikawa: Nuwamba-24-2023
