电磁超介质覆层在天线设计中的应用分析

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1、AbstractAbstractMetamaterial(MMs)isakindofartificialelectromagneticmaterialsartificial,whichpossessesmanyvaluableextraordinaryphysicalpropertiesthatnaturalmediumdoesnothave.Itcannotonlyimprovethegainoftheantenna,butalsoisusedtobroadentheantenna’sband.Itprovidesnewidea

2、sfordesigningantennawithhignperformance.MMscanbeappliedtotheantennainmanyforms.Ithasbroadprospectsontheapplicationinwirelesscommunication.InthispapertheapplicationoftheMMs-claddinginantennadesignationisresearched.severalantennasloadedwithMMs-claddinghavebeendesigned.T

3、hemaincontentsareasfollow:1.Firstly,basedonthetheoryofplasma,theelectromagneticcharacteristicoftheperiodicmetallic-rodsarraysisanalyzedandtheexpressofthenegativepermittivityisderived.Then,periodiccut-wire-gridMM-claddingandnon-periodiccut-wire-gridMM-claddingaredesign

4、edbasedonthetheoryoftheMMspatialmatchlayer.Themonopoleisputintothecentreofthecladdingtoimprovethegain(thegainscanrespectivelyreachupto5.5dBiand6.5dBi).Thelattertypeofcladdingcanfurtherbroadenthewideband(whichisbroadenby26%whencomparedtothemonopole).Besides,Thetwotypes

5、canrealizetheomni-directionalradiationandstabilitybeamdirectioninthewholeband.2.Basedonpropertyofnear-fieldresonantparasiticofnegativepermittivityMMs,threecylindricalMM-cladding:meanderline,“H”-shapedstructure,“I”-shapedstructure(ISS)aredesignedbydeformingtraditionalm

6、etal-wiresarrays.Amongthem,“H”-shapedstructurehasthewidestbandwidth2.6-7.1GHz,themonopolewiththeISShasthehighestgain6.2dBi.ThenovelantennaloadedwithmeandelineandISSarefabricated,agoodagreementisobtainedbetweenthesimulationsandthemeasurement.Keywords:Metamaterials(MMs)

7、;MM-cladding;monopole;near-fieldresonantparasitic;ultra-widebandII万方数据目录目录摘要......................................................................................................................................IAbstract.................................................

8、..............................................................................II目录..........................................