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1、ABSTRACTABSTRACTItiswidelybelievedthatMIMO(Multiple-InputMultiple-Output)countsamongcoretechnologiesofthefourthgenerationLTE(LongTermEvolution)mobilecommunicationsystem.Duetolimitationsofmobilephoneantennasizeandantennaelementsmutualcoupling,etc,MIMOtechnologyincellularmobilecommunicationisstil
2、lrarelycommerciallyimplemented.Futhermore,thefourthgenerationLTEmobilecommunicationsystemneedtotakeintoaccounttheexistingfrequencybandofpreviousthreegenerationcommunicationsystems,themobilephoneantennamustbalancetheminiaturizationandthecharacteristicsofmultiband.Inthisarticle,therefore,theminia
3、tureLTE/GSM/UMTSmulti-bandmobilephoneantennaisdesignedandresearched.Firstly,theperformanceofPIFAantennaandthetechnologyofcellphoneminiaturizationmultibandantennaarestudiedinthispapertoprovidenecessarytheoreticalbasisforthedesignofMIMOcellphoneantennaelement.Itmainlystudythepositiveeffectofcoupl
4、ingfeedtechnique,matchingcircuitload,meander-lineloadedandlumpedinductanceloadedtechnologyinthedesignofcell-phoneantennaontheantenna’smultiband,broadbandandminiaturization.Usingthetechniqueofcouplingfeedandmeander-lineloaded,twonovelon-boardcoupled-fedprintedmonopolesforseven-bandoperationarepr
5、oposed.Andbyadoptingthetechnologyofmatchingcircuitloadedandlumpedinductanceloaded,aminiaturemobilephoneantennaforeight-bandoperationissuccessfullysuggested.Thesimulationandtestresultsalldemonstratetheproposedthreecell-phoneantennashaveagoodVSWRandradiationcharacteristic.Secondly,thegroundbranch
6、esdecouplingtechniqueisalsoresearched,andaminiaturemultibandMIMOcellphoneantennaissuccessfullyobtained,whosesize3is25104??mm.Thedistancebetweenthetwoantennaelementsisonly10mm,andanewgroundbranchesstructurecomposedbyaU-shapedandtwosymmetricalL-shapedmetalstripsisadoptedforbroadbanddecoupling.The
7、S-parameter,radiationefficiency,3-DradiationpatternandECCallmeetdesignrequirementfromthesimulationandtestresults.Finally,anotherdecouplingtechnique,whichiscalledneutralizationlinesIIABSTRACTdecouplingmethod,isdiscussedinthisarticl
