小型化超宽带多陷波天线与uwb-mimo天线设计与分析

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1、Abs仃actmicrostrip—fedisdesigned；itssizeis28mmx30rain．Thisantennatakingsquareasaradiationpatchhasimpedancebandwidthfrom3．6GHzto9．9GHz．Acircularslotiscarriedinthepatchtoincreasethecurrentlengthandtoexpandthebandwidth．Thentakingthisstructureasprototype；animprovedUWBantennawithsecond—orderfractalringa

2、ndstepgroundplaneisintroduced．Theimpedancebandwidthofthisimprovedantennacovers3．1GHz-13．9GHz．Meanwhile，thisantennaispresentedwithfull‘‘8’’radiationpatteminEsurfaceandperfectcircleradiationpatterninHsurface，whichshowsgoodomnidirectionalradiationcharacteristics．ByloadingtheElectromagneticBand-Gap(EB

3、G)structure，weachievestop-bandat6．8GHz-7．9GHz，whichissuitableforrestrainingX—bandsatellitecommunication．ButtheEBGsizeisalittlebigcomparedwithcompactantenna,whichCancauseneedlessresonantfrequenciestoaffecttheband—notchedaccuracy．Sothisband-rejectedwaydoesn’tapplyincompactUWBantenna．Thenmultipleappr

4、oacheslikeslotting，addingmatchingstubandloadingSteppedImpedanceResonator(SIR)isusedtoobtainband—stoppingcharacteristics，finanythreeband-notchedcharacteristics(2．75GHz一3．55GHz，3．75GHz-4．27GHzand7．18GHz-8．35GHz)Canbeachieved．ThisantennacanbeusedinUWBcommunicationsystemthatmustrejectWiMAX，C／X—bandsat

5、elliteandEESScommunicationsystems．Thereafter，wedesignsmallUWB-MIMOantennawithhighisolation．AhexagonalUWBantennaelementisfirstlyproposed，thisantennaisverysuitableastheunitofMIMOantennasonaccountofitsadvantagesofeasyandcompactstructure．ThenaMIMOantennawithultra-widebandconsistsoftwodesignedantennael

6、ementsplacedside-to-side．Inordertoimproveisolation,anadditionalcross-shapedstubwhichhasbettertunableeffectcomparedtorectangularstubisloadedonthecenterlineofthegroundplane．Byoptimizingthisantenna,acompactsize32mmx32111111isachieved，meanwhileimpedancebandwidthCancover2．6GHz一13GHzandinthebandportisol

7、ationisalllessthan-17dB．Keywords：Miniaturization；ultra--widebandantenna；multiple·-band··reject；MIMOantenna；highisolationIV目录目录第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1选题背景及科学意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。11．2超宽带天线技术概况⋯⋯⋯⋯