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1、萬(wàn)方數(shù)據(jù)ABSTRACTInvestigationsonSubstrateIntegratedWidebandAntennasandMulti．．BandMulti．．PolarizationAntennasM．S．Candidate：ZHANGTaoSupervisor：Prof．HONGWeiandProf．WUKeStateKeyLaboratoryofMillimeterWaves，SchoolofInformationScienceandEngineering，SoutheastUniversity,Nanjing，210096，P．R．ChinaAbstractAnt
2、ennasareessentialpartsofmicrowaveandmillimeterwavesystemssuchasmobilecommunications，satellitecommunications，radarandnavigations．附(ingintoconsiderationthetrendsofcompactness，multi．bands，multi．functionsforsuchsystems，theintegratedantennasareattractingmoreandmoreresearchfocus．T11iSdissertationin
3、vestigatesthesubstrateintegratedwidebandantennasandmultiplebandantennas．Thedissertationisorganizedasfollows：CHAPTERONEproposesaQ．banddual．modewidebandpatchantennaelementanda2x2arraybasedontheSubstrateIntegratedWaveguide(SIW)technologyforplanarintegration．First，byloadinganinductiveviaandacapac
4、itiveannularslot，anewindependently．controllableresonanceisintroducedtothetraditionalpatchantenna,whichexpandsthebandwidthfrom6．9％to12．4％．Then．the打aditionalcircuitmodelfortheconventionalcoaxial．fedpatchantennaisimprovedbyintroducingamutualinductor,andanequivalentcircuitisdevelopedforthedual．mo
5、deantennaelement．Moreover,a2x2widebandarraybasedontheSIWtechnologyisdesignedandtested．Themeasuredimpedancebandwidth(returnlossbelow．10dB)and2dBgainbandwidthofthearrayreach12．7％and13．95％．respectively．TheworkofthischapterhasbeenpublishedintheintemationalconferenceofI湖’2013．CHAPTERTWOproposesaty
6、peofQ-bandwidebandcircularlypolarized(CP)antennaelements，andantennaarraybasedonthelowCOstsingle．1ayerPrintedCircuitBoard(PCB)process．First．byemployingtheSIWtechnology,anewmillimeter—wavewidebandCPantennaiSproposedwiththeaxialratio(AR)andtheimpedancebandwidthwiderthan20％(from38GHzto47GHz)．Then
7、．byintroducingthesecond—orderinductivewindow,the1dBgainbandwidthoftheantennaelementisexpandedfrom3GHzto9GHzwiththeARandimpedancebandwidthalmostunchanged．Finally,thebandwidthpropertiesofthetraditionaldual．feddual—polarizationpatchantennaarrayu
