A Broadband Dual-Polarized Magneto-Electric Dipole Antenna With Simple Feeds

60IEEEANTENNASANDWIRELESSPROPAGATIONLETTERS,VOL.8,2009

ABroadbandDual-PolarizedMagneto-Electric

DipoleAntennaWithSimpleFeeds

BiQunWu,GraduateStudentMember,IEEE,andKwai-ManLuk,Fellow,IEEE

Abstract—Anoveldual-polarizedmagneto-electricdipolean-tennaexcitedbytwo0-shapedstripsispresented.Theantenna

2)achievesacommonimpedancebandwidthof65.9%(

A Broadband Dual-Polarized Magneto-Electric Dipole Antenna With Simple Feeds

SWR

atbothinputports.Theantennahasexcellentperformanceinisolation,whichismorethan36dBbetweenthetwoinputports,andthegainoftheantennaisabout9.5dBi.Theradiationpatternandbandwidthovertheoperatingfrequencybandareverystable.IndexTerms—Cross-polarization,dual-polarizedmagneto-elec-tricdipoleantenna,0-shapedstripfeed,highisolationanddual-polarization.

I

I.INTRODUCTION

NTHEDEVELOPMENTofrecentwirelesscommunica-tions,thecapacityissueisbecomingcriticalduetotheex-pansionofwirelessservicesandthenumberofmobilesub-scribers.Researchworkhasbeenfocusedonfrequencyreuseandpolarizationdiversitybyusingtwoorthogonalpolarizations[1].Forthepastfew

A Broadband Dual-Polarized Magneto-Electric Dipole Antenna With Simple Feeds

A Broadband Dual-Polarized Magneto-Electric Dipole Antenna With Simple Feeds

A Broadband Dual-Polarized Magneto-Electric Dipole Antenna With Simple Feeds

years,dual-polarizedantennashavebeenusedwidelyinmobilecommunicationstoincreaseca-pacityandreducetheinstallationcosts[2].Signi cantadvance-mentinthedesign

A Broadband Dual-Polarized Magneto-Electric Dipole Antenna With Simple Feeds

A Broadband Dual-Polarized Magneto-Electric Dipole Antenna With Simple Feeds

A Broadband Dual-Polarized Magneto-Electric Dipole Antenna With Simple Feeds

ofdual-polarizedantennasisobserved.However,itisdif culttoachievewidebandwidth,highisola-tion,andlowcross-polarizationsimultaneously[1].Thepatchantennaisagoodchoiceoverotherkindsofantennasduetoitslowpro le,lightweight,lowcosts,andeasyfabricationfordual-polarizationimplementation[3].Byemployingaperture-coupledfeeds,ahigh-isolationantennawithwideimpedancebandwidthofmorethan14%canbeobtained[4].WiththeuseofL-probefeeds,apatchantennawithimpedancebandwidthofabout24%andisolationover30dBcanbeobtained[1].How-ever,itrequirestwopairsofL-shapedprobestosuppressthecouplingforachievinghighisolationbetweentwoports,whichincreasesthecomplexityoftheantennaandcostsoffabrication[3].

Aconceptofexcitingelectricdipoleandmagneticdipolesi-multaneouslytoproduceequalE-andH-planesradiationpat-ternswas rstrevealedbyClavin[5].Sincethen,severalinves-tigations[6],[7]havebeenconductedtodemonstratethesameconceptofcomplementaryantenna.In1974,Clavinpresentedasimplestructureofcomplementaryantenna[8]inwhichtwoparasiticinverted-Lwiresareplacedbesideaslotantenna.The

Fig.1.Photographofadual-polarizedmagneto-electricdipoleantennawithground

A Broadband Dual-Polarized Magneto-Electric Dipole Antenna With Simple Feeds

plane.

Fig.2.Perspectiveviewofadual-polarizedmagneto-electricdipoleantenna.

ManuscriptreceivedOctober02,2008;revisedDecember11,2008.Firstpub-lishedDecember31,2008;currentversionpublishedApril17,2009.ThisworkwassupportedinpartbyagrantfromtheResearchGrantCommerceoftheHongKongSpecialAdministrationRegion,China[ProjectNo.CityU119008].TheauthorsarewiththeStateKeyLaboratoryofMillimeterWaves,Depart-mentofElectronicEngineering,CityUniversityofHongKong,KowloonTong,HongKong(e-mail:50538940@student.cityu.edu.hk).

Colorversionsofoneormoreofthe guresinthisletterareavailableonlineathttp://www.wendangwang.com.

DigitalObjectIdenti er

A Broadband Dual-Polarized Magneto-Electric Dipole Antenna With Simple Feeds

10.1109/LAWP.2008.2011656

twoparasiticinverted-Lwiresactlikeanelectricdipole,andtherectangularslotactslikeamagneticdipole.

Recently,awidebandcomplementaryantennadesignatedasthemagneto-electricdipolewasproposedbyLuketal.[9],[10].Theantennacomprisesaverticallyorientedquarter-waveshortedpatchandaplanardipole,whichareequivalenttoacom-binationofamagneticdipoleandelectricdipole.Goodelec-tricalcharacteristics,suchaslowbackradiation,stableantennaacrosstheoperatingband,andsymmetricE-andH-planeradia-tionpatterns,weredemonstrated.Inthisletter,adual-polarizedmagneto-electricdipoleantennaexcitedbytwo-shapedstripsispresented.

1536-1225/$25.00©2009IEEE

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