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A fractal dipole tag antenna for RFID dual band application

RFID

ationandinputimpedanceoftheproposedantenna.Themeasuredbandwidthofproposedantennacoveredtworesonancemode,21%on rstmodeforUHFbandand28.4%onsecondmodeformicrowaveband,respectively.ThereturnlossismeasuredbyusingtheHP8720Cvectornetworkanalyzer.Theproposedan-tennaismeasuredinNTUT3Dantennachamber.Themeasure-mentchambercouldbemeasuredfrom0.8to18GHzandcoveredneedfulwideband,itstotaldimensionof3.25m 2.82m 6.65m.

Themeasuredradiationpatternsoftheproposedantennaat910MHzand2.45GHz,respectively,areillustratedinFigure3

A fractal dipole tag antenna for RFID dual band application

and

Figure3Measuredradiationpatternsoftheproposedantennaat910MHz:(a)E-planeand(b)

A fractal dipole tag antenna for RFID dual band application

H-plane

3.SIMULATEDANDMEASUREDRESULTS

Figure2showsthesimulatedandmeasuredreturnlossoftheproposeddipoletagantennawithfractalshaperadiator.Evidently,theresultsoftheexperimentandsimulationarefairlyingoodagreement.Itshowsthesigni canteffectsonthebandwidth.Themeasuredreturnlossofrectangularfractalshapeoperationportioniswithin850–1050MHz( 10dBreturnloss)atthe rstreso-nancemode.Nevertheless,thefractalshapehastheadvantagesforwidebandspectrum.Themeanderpatchnearfeedpointshowsthesigni cationfactoronthevariationofsecondresonancemodewithin2.02–2.69GHz,anditalsoin uences rstlow-bandoper-

Figure4Measuredradiationpatternsoftheproposedantennaat2.45GHz:(a)E-planeand(b)H-plane

DOI10.1002/mopMICROWAVEANDOPTICALTECHNOLOGYLETTERS/Vol.50,No.7,July20081965

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