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1、AbstractmeritoflOWVOlume．Secondly,adual··portpatchantennaofdual·-polarizeddirectionalradiationispresented．Thepatchelementisasquareoftwoopenslots．Thedesignedantennacanradiatethemicrostripantennamode，whichisexceedbycoaxialline，andthefoldeddipolemodeexceedbyacoplana
2、rstripe．Theexperimentalresultsshowthatovertheoperatingfi'equenciestheisolationbetweentwoportsisbetterthan23dB．Meanwhilethepolarizationisolationlevelsarelargerthan30dBatthemainradiatingdirectionforallthetwoports．ThisproposedantennaissuitedfortheWLANwall-mountedbas
3、e-stationsystems．Then，aunidirectional,dual—polarizedMIMOantennaisproposedforindoor2．4-GHzWLAN．Thisantennaconsistsofacavity·backedannularslotandtwoinvertedmicrostripfeedlineswhicharemutuallyorthogonal．Theexperimentalresultsshowthatthisantennahasmorethan32dBportiso
4、lation,andthecross-polarizedlevelsareless30dBthantheCO—polarizationovertheworkingband．ThecompactsizeandexcellentperformancesindicatethisdesignedantennacanbeeasilyappliedinindoorMIMOWLANbasestation．Onthisbasis，atri-polarizationMIMOantennaispresented，sincethatthefa
5、dingoforthogonalsignalareirrelevant．ThisantennahasgoodperformancesintheTD-LTEband．Finally,wesummarizethedesignkeypointsinthisthesisandproposethefurtherresearchobject．Keywords：MIMOantenna；Highisolation；Multipolarization；PatchantennaV目錄第一章緒論??????????????????????．1
6、1．1移動通信系統(tǒng)概述????．．．???????????????．．11．2MIMO技術(shù)的研究背景及意義???????????????．．21．4論文主要內(nèi)容和結(jié)構(gòu)規(guī)劃?????????????????12參考文獻(xiàn)?????????????????????????．13第二章MIMO天線的基礎(chǔ)理論?????????????．162．1天線的基本參數(shù)?????????????????????162．2MIMO天線的特有參數(shù)??????????????????232．3提高M(jìn)IMO天線單元隔離度的方法???????????
7、?．．272．4本章小結(jié)????????????????????????39參考文獻(xiàn)?????????????????????????．39第三章雙饋雙極化微帶天線??????????????453．1徽帶天線理論??????????????????????453．2天線的設(shè)計???????????????????????523．2．1天線結(jié)構(gòu)與分析??????????????????一523．2．2實(shí)驗結(jié)果與分析??????????????????．．543．3本章小結(jié)????????????????????????5
8、7參考文獻(xiàn)?????????????????????????．57第四章共置雙極化單向輻射天線????????????．59V目錄4．1引言??????????????????????????594．2天線結(jié)構(gòu)與分析?????????????????????594．3實(shí)驗結(jié)果與分析??????????????????
