无人机双频宽带圆极化缝隙天线

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中图分类号：TN823.24-34 文献标识码：A 文章编号：1004-373X（2026）09-0022-06

Abstract：Adual-band circularly polarized slot antenna basedondefect ground structureis proposed to meet thedemand for multi-band and circular polarization in UAV communication. The 2.4GHz and 5.O GHz band radiation can be achieved by adjustingthesizeoftheL-shapedradiator.Defectdesigniscariedoutontheflor，andtheradiatoriscoupled witha box-shapedfloortoefectivelybroadentheimpedancebandwidth（IBW）oftheantenna.Tworectangularpatchesofdiferentsizes areaddedtothediagonalofthefloortoachievedualbandcircularlypolarizedradiation.Thefloorischamferedtoexpandthe 2.4GHzfrequencybandaxialratiobandwidth（ARBW），andacircularholeisopenedintheupperleftcornerofthefloorto furtherexpandthe5.OGHz frequencybandARBW.Theedgeoftheflooisslottedtofurtherreducetheantennasizeand expand the impedance bandwidth （IBW）.Theoptimaloptimized sizeis 60.5mm×60.5 mmx0.8mm.The measurement results showthat theIBWoftheantennais2.12～3.47GHz，its3dBcircularlypolarizedARBWis2.27～2.91GHz，andits peakgains are2.65dBiand2.73dBi，respectively.ThisUAVantennahas theadvantagesofsimplestructure，smallsize，andlowprofile.

Keywords：UAV；defectedground；dual frequency；circularpolarization；microstripantenna；broadbandantenna： miniaturizedantenna;antennastructure

0 引言

随着无人机（UAV）在智慧农业、灾害救援等领域的规模化应用，其无线通信系统面临传输距离短、抗干扰能力弱等瓶颈。（剩余8070字）