Bandwidth ndi gawo lina lofunikira la antenna.Bandwidth imafotokoza kuchuluka kwa ma frequency omwe mlongoti umatha kutulutsa bwino kapena kulandira mphamvu.Nthawi zambiri, bandwidth yofunikira ndi imodzi mwamagawo omwe amagwiritsidwa ntchito posankha mtundu wa mlongoti.Mwachitsanzo, pali mitundu yambiri ya tinyanga tokhala ndi ma bandwidth ochepa kwambiri.Tinyanga izi sizingagwiritsidwe ntchito popanga ma Broadband.
Bandwidth nthawi zambiri imatchulidwa malinga ndi voltage Stand wave ratio (VSWR).Mwachitsanzo, mlongoti ukhoza kufotokozedwa kuti uli ndi VSWR <1.5 pa 100-400 MHz.Mawuwo akuti chiwonetsero chazithunzi chimakhala chochepera 0.2 pama frequency omwe atchulidwa.Chifukwa chake, mwa mphamvu zomwe zimaperekedwa ku mlongoti, 4% yokha ya mphamvuyo imabwereranso ku transmitter.Kuwonjezera apo, kubwereranso kutaya S11 =20* LOG10 (0.2) = 13.98 decibels.
Chonde dziwani kuti zomwe tafotokozazi sizikutanthauza kuti 96% ya mphamvuyo imaperekedwa ku mlongoti mu mawonekedwe a ma radiation a electromagnetic radiation.Kutaya mphamvu kuyenera kuganiziridwa.
Kuphatikiza apo, mawonekedwe a radiation amatha kusiyanasiyana ndi ma frequency.Nthawi zambiri, mawonekedwe a mawonekedwe a radiation sasintha kwambiri ma frequency.
Pakhoza kukhalanso miyezo ina yomwe imagwiritsidwa ntchito pofotokozera bandwidth.Izi zitha kukhala polarizing mkati mwamitundu ina.Mwachitsanzo, mlongoti wozungulira polarized akhoza kufotokozedwa kuti uli ndi axial ratio ya <3 dB kuchokera ku 1.4-1.6 GHz (osakwana 3 dB).Mtundu uwu wa polarization bandwidth uli pafupi ndi tinyanga tozungulira polarized.
Bandwidth nthawi zambiri imatchulidwa mu Fractional Bandwidth (FBW).FBW ndi chiŵerengero cha ma frequency osiyanasiyana ogawidwa ndi ma frequency apakati (ma frequency apamwamba kwambiri otsika kwambiri)."Q" ya mlongoti imagwirizananso ndi bandwidth (Q yapamwamba imatanthawuza kutsika kwa bandwidth ndi mosemphanitsa).
Kuti mupereke zitsanzo zowoneka bwino za bandwidth, nayi tebulo la ma bandwidths amitundu wamba ya tinyanga.Izi zidzayankha mafunso, "Kodi bandwidth ya dipole antenna ndi chiyani?"ndi "Ndi mlongoti uti umene uli ndi bandwidth yapamwamba - chigamba kapena helix antenna?".Poyerekeza, tili ndi tinyanga tokhala ndi ma frequency apakati a 1 GHz (gigahertz) iliyonse.
Bandwidth of angapo tinyanga wamba.
Monga mukuwonera patebulo, bandwidth ya antenna imatha kusiyana kwambiri.Tinyanga (microstrip) ndi bandwidth yotsika kwambiri, pomwe tinyanga ta helical tili ndi bandwidth yayikulu kwambiri.
Nthawi yotumiza: Nov-24-2023
