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1、IEEEANTENNASANDWIRELESSPROPAGATIONLETTERS,VOL.2,2003323ABroadbandCPW-FedLoopSlotAntennaWithHarmonicControlXian-ChangLinandLing-TengWangAbstract—Inthisletter,photonicbandgap(PBG)struc-tureswithcross-shapedorsquare-shapedlatticeshavebeenincorporatedintothefeednetworkforharmonicsuppression.E
2、xperimentalresultsshowthatPBGstructuresnotonlyexhibitwell-behavedbandstopcharacteristics,butalsoenhancethebandwidthoftheproposedantennas.Fortheproposedantennawithsquare-shapedlattices,the10-dBreturnlossbandwidthcouldreach1541MHz(15253066MHz),whichisabout70%withrespecttothecenterfrequencyo
3、f2200MHzwhile,fortheantennawithcross-shapedlattices,thebandwidthcouldreach1320MHz(15602880MHz),whichisabout60%withrespecttothecenterfrequencyof2200MHz.IndexTerms—Broadbandantenna,CPW-fedloopslotantenna,harmonicsuppression,photonicbandgap(PBG).I.INTRODUCTIONHECPW-fedslotantennashavebeenwid
4、elyusedforTwirelessapplicationssincetheyarecompatiblewithmonolithicintegratedcircuitsandactivesolid-statedevices.Fig.1.Geometryofthebroadbandloopslotantennawithsquare-shapedFurthermore,CPW-fedslotantennasexhibitalargerbandwidthlattices.withbi-directionalradiationpatterns[1].Amongtherecent
5、researches,aCPW-fedloopslotantennawithatuningstubtowithsquare-shapedlatticeshasdemonstratedexcellentperfor-enhancethebandwidthhasbeenproposed[2].Byadjustingthemancesofharmonicsuppressionandbandwidthenhancement.locationofawidenedtuningstub,goodimpedancematchingInthiswork,theuseofPBGstructu
6、reswithdifferentlatticecanbeeasilyobtained.Itisfoundthatthelargerthespacingshapestoprohibitharmonicmodesandbroadenthebandwidthbetweenthegroundplaneandthewidenedtuningstub,theisdiscussedindetail.widerthefundamentalbandwidth.However,bandwidthsofhigherordermodeswillincreasesimultaneously,whi
7、chmayII.ANTENNADESIGNcauseapotentialproblemoftheelectromagneticinterferenceInthefirstdesign,aCPW-fedloopslotantennawithsquare-andcompatibility.shapedlatticesinthefeednetworkhasbeenimplemented,asToalleviatethisserioussymptomoftheconventionalshowninFig.1.Theproposedan
