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1、基于电磁超材料的新型无线终端天线研究AbstractAbstractThenextgenerationcommunicationsystemisdevelopingtowardshigh-speed,high-quality,broadbandandhigh-capacity.Multiple-inputandmultiple-output(MIMO)isatechnologywhichusesdiversitytechniquestoimprovechannelcapacity.Itutilizes
2、multipleantennasbothinbasestationandhandset.Thedesignofmultipleantennasinhandsetsisadifficultybecauseofitslimitspace,whichrestrictsthedevelopmentofMIMOtechnology.Moreover,theexistingcommunicationtechnologiessuchas2Gand3Geventhecoming4Gwillcoexistforalon
3、gtimewhichrequiretheantennasofahandsettocovermultiplecommunicationbands.Itmakesthedesignofantennamuchmoredifficult.Targetingattherequirementandtrendofthenextwirelesscommunicationsystem,thethesisresearchesthekeytechniquesincludingtheminiaturization,high-
4、quality,multi-band,MIMOandhighisolationdesignofantennaswhichcanbeusedinwirelessterminalsbyusingmetamaterials.Thisthesisfirstintroducesthebasictheory,theuniquecharacteristicsandtheimplementingformofthelefthandedmaterials.Thecomparativeanalysisofthetwomai
5、nlyimplementingformsofthelefthandedmaterialsisgiven,whichisresonantstructuresandnon-resonantstructures.Wepayourattentiontothetheoryofthecompositerightandlefthandedtransmissionlines(CRLH-TL).Inaddition,thethesisintroducesthebasictheoryofMIMOtechniques,th
6、ediversitytechniquesandtheparameterswhichareusedtoevaluatetheperformanceofthediversitytechniquesindetails.Thetheoryofdualzero-orderresonance(ZOR)isproposedtodesignacompactantennawithhighperformance,whichcancovermultiplecommunicationbandsofGSM850/900、DCS
7、1800/1900and3G.Theproposedantennahasamonopole-likeradiationpatternandhighefficiency.Themeasurementresultsofthemanufacturingantennaconfirmthatitsperformanceissatisfyingtherequirementofthehandset.Theeffectofeachpartoftheantennaontheperformanceisalsoanalyz
8、ed.Finally,weoptimizetheheightoftheantennaholder,andthesimulationresultsshowtheantennaoptimizedisalsosatisfyingtherequirementofthehandset.ThedecouplingtechniquesoftwoantennasinhandsetforMIMOcommunicationarestudiedinthisthesis,esp
