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1、摘要微帶天線具有體積小,重量輕,低剖面,制造成本低,易于批量生產(chǎn),易于和微帶線路集成等特點,能得到單方向的寬瓣方向圖,易于實現(xiàn)雙頻段、雙極化等多功能工作。這些優(yōu)點使得微帶天線在大約100MHz~100GHz寬廣頻域上,廣泛應(yīng)用于包括衛(wèi)星通信、雷達(dá)、遙感、制導(dǎo)武器以及便攜式無線電設(shè)備。論文首先回顧了微帶天線的發(fā)展史,介紹了它的結(jié)構(gòu)、優(yōu)缺點及應(yīng)用,然后給出了微帶天線的幾種分析方法,包括傳輸線法,空腔模型法,積分方程法等,并介紹了微帶天線圓極化的原理和實現(xiàn)方法以及微帶天線的饋電方式。然后在AnsoftHFSS中創(chuàng)建了一個單饋圓極化微帶天線和雙饋圓極化微帶天線,分析了S11和VS
2、WR參數(shù),畫出了方向圖。為了實現(xiàn)圓極化,進行了軸比的優(yōu)化仿真,達(dá)到了較為理想的結(jié)果。關(guān)鍵詞:微帶天線、圓極化、軸比AbstractThemicrostripantennashasthevolumetobesmall,theweightislight,thelowsectionplane,theproductioncostislow,easyvolumeproduction,easyandcharacteristicsandsoonmicrostriplineintegration,canobtainthesingledirectionwidepetaldirectiona
3、ldiagram,easytorealize,thedoublepolarizationdualrangeandsoonmulti-purposework.Thesemeritscausethemicrostripantennasinapproximatelythe100MHz-100GHzbroadfrequencyrange,widelyappliesinincludesthesatellitecommunication,theradar,theremotesensing,theguidedweaponaswellastheportablewirelessappara
4、tus.Thepaperfirstreviewedmicrostripantennas'shistory,introduceditsstructure,thegoodandbadpointsandtheapplication,thenhavegivenmicrostripantennas'sseveralanalysismethod,includingthetransmissionlong-basemethod,thecavitymodeling,theintegralequationlawandsoon,andintroducedthemicrostripantenna
5、scircularpolarization'sprincipleandrealizesthemethodaswellasmicrostripantennas'sfeedmethod.ThenAnSoftHfssinthecreationofasingle-fedcircularpolarizationmicrostripantennaanddouble-fedcircularpolarizationmicrostripantennaanddouble-fedcircularpolarizationmicrostripantenna,theanalysisoftheS11a
6、ndVSWRparameters,todrawapattern.Inordertoachievecircularpolarization,theaxiscarriedontheoptimizationsimulation,toamoresatisfactoryresults.Keywords:microstripantenna;circularpolarization;axialratio目錄摘要IABSTRACTII目錄III第一章緒論1§1.1微帶天線的發(fā)展1§1.2微帶天線的定義和結(jié)構(gòu)1§1.3微帶天線的優(yōu)缺點2§1.4微帶天線的應(yīng)用3第二章微帶天線的原理技術(shù)4§2
7、.1微帶天線的輻射機理4§2.2微帶天線的分析方法5§2.2.1傳輸線模型法5§2.2.2空腔模型法8§2.2.3積分方程法8§2.3微帶天線的饋電方法9§2.4微帶天線圓極化技術(shù)10§2.4.1圓極化天線的原理10§2.4.2圓極化實現(xiàn)技術(shù)11§2.5其他形式的微帶天線15第三章圓極化微帶天線的仿真與優(yōu)化19§3.1AnsoftHFSS高頻仿真軟件的介紹19§3.2圓極化微帶天線的仿真優(yōu)化19§3.2.1圓極化微帶天線的仿真設(shè)計19§3.2.2天線軸比的優(yōu)化22第四章雙饋圓極化微帶天線的設(shè)計25§4.1兩路微帶等功率分配器的