Ⅰ空气贴片微带天线的设计摘要微带天线的发展正方兴未艾,应用前景非常广泛。由于应用的需要,微带天线在许多方面还将得到进一步的发展,如天线介质材料的更新,天线的多极化技术,分形技术,光子带隙技术以及计算机辅助设计技术和计算机辅助制造技术等.随着技术的发展以及人们对微带天线的深入研究和探讨,微带天线将会得到更为广泛的用。本文着重点是，设计了一款可用于UHF频段（915MHz）圆极化微带天线。采用双层介质微带贴片展宽天线频带。设计适用于UHF频段的微带圆极化天线。要求体积小，增益高。具体指标如下：EQ\o\ac(○,1)工作频率：902-928MHz；EQ\o\ac(○,2)增益：大于5dBi；EQ\o\ac(○,3)驻波比：小于2.0；EQ\o\ac(○,4)极化方式：圆极化，并利用Ansoft软件进行仿真设计。关键词：微带天线；Ansoft软件；圆极化ⅡⅢTheAirMicrostripPatchAntennaDesignAbstractAbstractThedevelopmentofthemicrostripantennaisintheascendantandalsoithasverybroadapplicationprospects.Sincetherequestoftheapplication,themicrotstripwillbefurtherdevelopedinmanyways,forexampleupdatethematerialofthedielectricantenna,Multi-polarizationtechnology,fractaltechnology,photonicbandgap(PBG)aswellascomputeraideddesign(CAD)technologyandcomputeraidedmanufacturing(CAM)technology,etc.Withthedevelopmentoftechnologyandthein-depthstudyanddiscussionofthemicrostripantenna,itwillbemorewidelyused.Inthisarticle,emphasisistodesignacircularlypolarizedmicrostripantennathatcanbeusedinUHF(915MHz)band.Double-layerdielectricmicrostripcanbeusedtobroadenantennabandwidth.MicrostripcircularpolarizedantennaisdesignedforuseintheUNFband.Itrequestssmallinsize,high-gain.Specificindicatorsareasfollows,EQ\o\ac(○,1)Operatingfrequency:902-928MHz;EQ\o\ac(○,2)Gain:greaterthan5dBi;EQ\o\ac(○,3)VSWR:lessthan2.0;EQ\o\ac(○,4)Polarizationmode:circularpolarizationalsoithastobesimulatedbyAnsoftsoftware.KeyWords：MicrostripAntenna；AnsoftSoftware；CircularlyPolarizationPAGE\*MERGEFORMATIII目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc357328737"1绪论PAGEREF_Toc357328738\h1HYPERLINK\l"_Toc357328738"1.1课题研究背景及意义PAGEREF_Toc357328738\h1HYPERLINK\l"_Toc357328739"1.2微带天线技术概述PAGEREF_Toc357328739\h1HYPERLINK\l"_Toc357328740"1.3本文主要研究工作PAGEREF_Toc357328740\h2HYPERLINK\l"_Toc357328741"2微带天线PAGEREF_Toc357328741\h3HYPERLINK\l"_Toc357328742"2.1微带天线研究现状PAGEREF_Toc357328742\h3HYPERLINK\