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1、射頻微帶陣列天線設(shè)計摘要微帶天線是一種具有體積小、重量輕、剖面低、易于載體共形、易于與微波集成電路一起集成等諸多優(yōu)點的天線形式，目前已在無線通信、遙感、雷達(dá)等諸多領(lǐng)域得到了廣泛應(yīng)用。同時研究也發(fā)現(xiàn)由于微帶天線其自身結(jié)構(gòu)特點，存在一些缺點，例如頻帶窄、增益低、方向性差等。通常將若干單個微帶天線單元按照一定規(guī)律排列起來組成微帶陣列天線，來增強(qiáng)天線的方向性，提高天線的增益。本文在學(xué)習(xí)微帶天線和天線陣的原理和基本理論，加以分析，利用Ansoft公司的高頻電磁場仿真軟件HFSS，設(shè)計了中心頻率在10GHz的4元均勻直線微帶陣列，優(yōu)化和調(diào)整了相關(guān)參數(shù)，然后分別對單個陣元和天線陣進(jìn)行仿真，對仿真結(jié)果進(jìn)
2、行分析，對比兩者在相關(guān)參數(shù)的差異。最后得到的研究結(jié)果表明，微帶天線陣列相較于單個微帶天線，由于陣元間存在互耦效應(yīng)以及存在饋電網(wǎng)絡(luò)的影響，微帶陣列天線的回波損耗要大于單個陣元。但是天線陣列增益明顯大于單個微帶天線，且陣列天線比單個陣元具有更好的方向性。關(guān)鍵詞：微帶天線微帶陣列天線方向性增益HFSS仿真Designof?Radio-Frequency?MicrostripArrayAntennaABSTRACTMicrostripantennaisakindofantennaformwithmanyadvantageslike,smallsize,lightweight,lowprofile
3、,easy-to-carrierconformal,easyintegrationwithmanyotherofmicrowaveintegratedcircuitsandsoon.NowmicrostriparrayhavebeenwildlyappliedinthefiledofwirelessIcommunications,remotesensingandradar,andmanyotherfiled.Whilesomestudyalsofoundthatbecauseofthemicrostripantenna’sstructuralcharacteristics,therear
4、esomedisadvantages,suchasnarrow-band,lowgain,poordirectivity.Typicallyweusemicrostripantennaelementsarrangedinaccordancewithcertainlawstogethertoformamicrostriparrayantennatoenhancethedirectivityandimprovethegainoftheantenna.Inthispaper,afterlearningthebasictheoryandprinciplesaboutmicrostripanten
5、naandantennaarray,Idesignedtwokindofantennamodelswith10GHzofcenterfrequency,oneisthesingleantenna,theotheroneisanantennaarraywith4singleantenna.ThenusingAnsoft'shighfrequencyelectromagneticsimulationsoftwareHFSS,optimizeandadjusttherelevantparameters.Afterthat,weusedtheHFSStosimulatethesinglearra
6、yelementandanantennaarrayseparately.Thenanalyzedthesimulationresults,comparedtothedifferenceintherelevantparameters.Theresultingsuggestedthatbecauseofthepresenceofmutualcouplingeffectsandtheimpactofthepresenceofthefeednetworkbetweenthepickets,thereturnlossofmicrostripantennaarrayisgreaterthanthes
7、inglemicrostripantennaarray,butantennagainissignificantlylargerthanasinglearrayantenna,andtheantennaarrayhasabetterdirectivitythanthesinglemicrostripantenna.IIKeywords:MicrostripArrayMicrostripArrayAntennaDirectivityGa
