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1、374IEEETRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES,VOL.51,NO.2,FEBRUARY20033-DFDTDDesignAnalysisofa2.4-GHzPolarization-DiversityPrintedDipoleAntennaWithIntegratedBalunandPolarization-SwitchingCircuitforWLANandWirelessCommunicationApplicationsHuey-RuChu
2、ang,Member,IEEE,andLiang-ChenKuo,StudentMember,IEEEAbstract—Detailnumericalsimulation,fabrication,andexperimentalmeasurementofa2.4-GHzpolarization-diversityprinteddipoleantennaarepresentedforwirelesscommunicationapplications.Twoorthogonalprinteddipole
3、antennasandeachwithamicrostripvia-holebalunfeedingstructurearecombinedandfabricatedonanFR-4printed-circuit-boardsubstrate.Ap-i-n-diodecircuitisusedtoswitchandselectthedesiredan-tennapolarization.Intheantennadesignsimulation,afull-wavemethodofathree-di
4、mensionalfinite-differencetime-domain(FDTD)methodisemployedtoanalyzetheentirestructureoftheprintedantennaincludingthelumpedelementsofthepolarization-selectedp-i-ndiodeswitchingcircuit.TheBerengerperfectlymatchedlayerabsorbing-boundaryconditionisusedfo
5、rtheFDTDcomputation.NumericalandmeasuredresultsofFig.1.Illustrationofa2.4-GHzpolarization-diversityantenna,whichconsistsantennaradiationcharacteristics,includinginputstanding-waveoftwoorthogonalprinteddipoleantennas,integratedmicrostripvia-holebaluns,
6、ratio,radiationpatterns,andpolarizationdiversityarepresented.andapolarization-selectionp-i-n-diodescircuit.IndexTerms—2.4GHz,finitedifferencetimedomain(FDTD),integratedbalun,p-i-ndiode,polarizationdiversity,printedtohaveapreferredplanarantennastructur
7、eforthe2.4-GHzdipole,switchingcircuit.polarization-diversityantenna,aprinteddipoleantennawithamicrostripvia-holebalunisdesigned.ResearchonprintedI.INTRODUCTIONdipoleantennaswithamicrostrip-feedlineincorporatedwithanNTHEURBANorindoorenvironments,therad
8、iowaveopen-circuitstubhasbeenreported,suchasin[5]–[7].ItisIwillpropagatethroughcomplicatedreflectionorscatteringknownthataopen-stubtransmissionlinecanbeequivalentprocesses.Thepolarizationoftheradiowavemaychangetoashortedcircuitandtheopenstubma
