具有陷波特性的超宽带mimo天线的研究与设计-电子与通信工程专业毕业论文

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1、AbstractAbstraotHigll-speedwirelesstransmissiontechnologies，e．g．UWB(UltraWideband)technologyandMIMO(Multiple-InputMultiple-Output)technology,havebecomethekeypointstosupportthemassdatathroughputfortodayinformationsociety．UWBtechnologyutilizesnanosecond·-orpicosecond--levelnon·-sinusoid

2、alpulsetransmittingdatasignals．Non·cartierUWBcommunicationshavethemeritsofhighdatarate，highsecurity,higllmultipathresolutioncapabilityandlow—emissionpower．MIMOtechnologyusesthemultipathpropagationcharacteristicsexponentiallyincreasesthewirelesscommunicationsystemchannelcapacity．Ithasb

3、eenthecoremethodofmodemlarge-capacityhigh—speedmobilecommunications．Combiningthesetwowirelesstransmissiontechnologieswillbecomethefuturemainstreamtechnologyofshort--rangehigh-speedlarge--capacitywirelesscommunicationsandpresentmoretechnologyadvantages．Theantenna，whichisoneofthecorehar

4、dwarecomponentsinwirelesscommunicationsystems，willplayakeyroletoimplementtheexcellentperformanceofthewirelesscommunications．ThedesignandanalysisofUWB·MIMOantennas，whichareemployedinUWB-MIMOwirelesscommunicationsystems，arethemaintopicsofourresearch．Inthisthesis，threekindsofUWB·MIMOante

5、nnaswithhi曲isolationandbetterband-notchedcharacteristicsaredesigned．Firstly,anovelband—notchedstructureisproposedandbasedonitadoubleband-notchedIm．MIMOantennaoftheminiaturizationfeatureiSconstructed．Thedoublenotchedbandisachievedbyusingtwodifferentband—notchedstructures．Meanwhileaslot

6、resonantorisintroducedtoimprovetheportisolation．Forthisproposedantenna，itsimpedancebandwidthisfrom2．95GHzto10．48GHzwithtwonotchedbandsof5．15-5．87GHzand7．28～8．0GHzandovertheoperatingbanditsisolationismorethan16dB．Then，aCPW-fed4-element。UWB-MIMOantennawithrotationalsymmetryelementsisdes

7、igned．Itsband-notchedcharacteristicisbasedonthehalf-wavelength万方数据ResearchandDesignofBand．-notchedUWB··MIMOAntennasslotresonators．Andacross-shapedMMR(multi-moderesonator)isaddedonthebacksideoftheantennasubstratetoachievemorethan一24．5dBisolation．Thisproposedantennahasacompactsizeof50In

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