I-Bandwidth ingenye ipharamitha ye-antenna eyisisekelo.I-Bandwidth ichaza ububanzi bezandi i-antenna engakwazi ukuyikhipha ngendlela efanele noma ithole amandla.Ngokujwayelekile, umkhawulokudonsa odingekayo ungenye yemingcele esetshenziselwa ukukhetha uhlobo lwe-antenna.Isibonelo, kunezinhlobo eziningi zama-antenna ezinomkhawulokudonsa omncane kakhulu.Lawa ma-antenna awakwazi ukusetshenziswa ezinhlelweni ze-broadband.
Umkhawulokudonsa uvame ukucashunwa ngokuya nge-voltage standing wave ratio (VSWR).Isibonelo, i-antenna ingase ichazwe njengene-VSWR <1.5 phezu kuka-100-400 MHz.Isitatimende sithi i-reflection coefficient ingaphansi kuka-0.2 kubo bonke ububanzi obucashuniwe.Ngakho-ke, emandleni alethwe ku-antenna, amaphesenti angu-4 kuphela wamandla aboniswa emuva kumthumeli.Ngaphezu kwalokho, ukulahlekelwa kokubuyisela S11 =20* LOG10 (0.2) = 13.98 decibel.
Sicela uqaphele ukuthi lokhu okungenhla akusho ukuthi u-96% wamandla alethwa othingo ngendlela yemisebe kagesi esakazwayo.Ukulahlekelwa kwamandla kufanele kucatshangelwe.
Ukwengeza, iphethini yemisebe izohluka ngokuvama.Ngokuvamile, ukuma kwephethini yemisebe akuguquli kakhulu imvamisa.
Kungase futhi kube namanye amazinga asetshenziselwa ukuchaza umkhawulokudonsa.Lokhu kungase kube ukuhlukanisa phakathi kwebanga elithile.Isibonelo, i-antenna eyisiyingi eyi-polarized ingachazwa njengenesilinganiso se-axial esingu-<3 dB ukusuka ku-1.4-1.6 GHz (ngaphansi kuka-3 dB).Lolu hlu lwezilungiselelo zomkhawulokudonsa we-polarization cishe olwezimpondo eziyisiyingi ezine-polarized.
Umkhawulokudonsa uvamise ukucaciswa ku-Fractional Bandwidth (FBW).I-FBW isilinganiso sobubanzi befrikhwensi ehlukaniswe ifrikhwensi emaphakathi (ifrikhwensi ephezulu kakhulu susa ifrikhwensi ephansi kakhulu).I-"Q" yothi iphinde ihlobane nomkhawulokudonsa (i-Q ephezulu isho umkhawulokudonsa ophansi futhi okuphambene nalokho).
Ukuze unikeze izibonelo ezithile ezibambekayo zomkhawulokudonsa, nali ithebula lama-bandwidths lezinhlobo ezijwayelekile ze-antenna.Lokhu kuzophendula imibuzo, "Iyini i-bandwidth ye-antenna ye-dipole?"kanye nokuthi "Iyiphi i-antenna ene-bandwidth ephakeme - isichibi noma i-helix antenna?".Uma siqhathanisa, sinama-antenna anemvamisa emaphakathi ye-1 GHz (gigahertz) ngayinye.
Umkhawulokudonsa wezimpondo ezimbalwa ezivamile.
Njengoba ubona etafuleni, i-bandwidth ye-antenna ingahluka kakhulu.Ama-antenna e-patch (microstrip) angumkhawulokudonsa ophansi kakhulu, kuyilapho izimpondo ze-helical zine-bandwidth enkulu kakhulu.
Isikhathi sokuthumela: Nov-24-2023
