I-bandwidth ingenye ipharamitha ye-antenna eyisisekelo. I-bandwidth ichaza ububanzi bemvamisa i-antenna engakhipha noma yamukele amandla ngendlela efanele. Ngokuvamile, i-bandwidth edingekayo ingenye yemingcele esetshenziswa ukukhetha uhlobo lwe-antenna. Isibonelo, kunezinhlobo eziningi ze-antenna ezine-bandwidth encane kakhulu. Lawa ma-antenna awakwazi ukusetshenziswa kuzinhlelo zokusebenza ze-broadband.
I-bandwidth ivame ukucashunwa ngokwesilinganiso samagagasi okuma kwe-voltage (VSWR). Isibonelo, i-antenna ingachazwa njengene-VSWR <1.5 ngaphezu kwe-100-400 MHz. Isitatimende sithi i-coefficient yokubonisa ingaphansi kuka-0.2 kulo lonke ububanzi bemvamisa ecashuniwe. Ngakho-ke, kumandla alethwa ku-antenna, yi-4% kuphela yamandla abonakala emuva ku-transmitter. Ngaphezu kwalokho, ukulahlekelwa kokubuya S11 =20* LOG10 (0.2) = 13.98 decibels.
Sicela uqaphele ukuthi okungenhla akusho ukuthi u-96% wamandla ulethwa ku-antenna ngesimo semisebe kagesi esakazekayo. Ukulahlekelwa kwamandla kumele kucatshangelwe.
Ngaphezu kwalokho, iphethini yemisebe izohluka ngokwemvamisa. Ngokuvamile, ukuma kwephethini yemisebe akushintshi kakhulu imvamisa.
Kungase kube nezinye izindinganiso ezisetshenziswa ukuchaza i-bandwidth. Lokhu kungaba ukugoqa ngaphakathi kobubanzi obuthile. Isibonelo, i-antenna egoqayo eyindilinga ingachazwa njengenesilinganiso se-axial esingu-<3 dB kusuka ku-1.4-1.6 GHz (ngaphansi kuka-3 dB). Lolu hlu lokusetha i-bandwidth ye-polarization lucishe lube ngama-antenna agoqayo ayindilinga.
I-bandwidth ivame ukucaciswa ku-Fractional Bandwidth yayo (FBW). I-FBW iyisilinganiso sobubanzi bemvamisa esihlukaniswe yi-centre frequency (i-highest frequency minus lowest frequency). I-"Q" ye-antenna ihlobene ne-bandwidth (i-Q ephezulu isho i-bandwidth ephansi kanye nokuphikisana nalokho).
Ukuze unikeze izibonelo ezithile eziqondile ze-bandwidth, nansi ithebula le-bandwidth yezinhlobo ze-antenna ezivamile. Lokhu kuzophendula imibuzo, "Iyini i-bandwidth ye-antenna ye-dipole?" kanye nokuthi "Iyiphi i-antenna ene-bandwidth ephezulu - i-patch noma i-antenna ye-helix?". Ukuze uqhathanise, sine-antenna enemvamisa ephakathi ye-1 GHz (gigahertz) ngayinye.
Ububanzi be-antenna eziningana ezivamile.
Njengoba ubona etafuleni, ububanzi be-antenna bungahluka kakhulu. Ama-antenna e-patch (microstrip) aphansi kakhulu, kuyilapho ama-antenna e-helical ene-bandwidth enkulu kakhulu.
Isikhathi sokuthunyelwe: Novemba-24-2023
