17. Recent Developments of Metamaterial-Based and Metamaterial-Inspired Efficient, Electrically Small Antennas

《17. Recent Developments of Metamaterial-Based and Metamaterial-Inspired Efficient, Electrically Small Antennas》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、FilippoCapolino/ApplicationsofMetamaterials_CFinalsPage--#17RecentDevelopmentsofMetamaterial-BasedandMetamaterial-InspiredEfficient,ElectricallySmallAntennas.Introduction.........................................-.CommonAntennaTerminologies...............

2、.....-.InfinitesimalDipoleAntennaSurroundedbyanENGShell:AnalyticalResults.....................-.DipoleAntennasSurroundedbyaMetamaterialENGShell:NumericalResults........................-RichardW.Ziolkowski.Metamaterial-InspiredElectric-BasedEZAntennaSystems......

3、........................................-UniversityofArizona.Conclusions..........................................-AycanErentokAcknowledgments.........................................-TechnicalUniversityofDenmarkReferences...........................................

4、......-17.1IntroductionAntennasthatareelectricallysmall,efficient,andhavesignificantbandwidthwouldfulfillmanyoftoday’semergingwirelesstechnologyrequirements,especiallyintheareasofcommunicationsandsensornetworks.However,itiswellknownthatanelectricallysmalldipoleantennabyitself

5、isaninefficientradiator,i.e.,becauseithasaverysmallradiationresistancewhilesimultaneouslyhavingaverylargecapacitancereactanceandalargeimpedancemismatchtoanyrealisticpowersourceexists.Thedesignofreactanceandresistivematchingnetworksisachallengingtaskthatoftenintroducesadditionalco

6、nstraintsontheoverallperformanceoftheresultingsystem[].Therehavebeenawidevarietyofrecentapproachestoachieveefficient,electricallysmallantennas(ESAs)includingcleverpackingofresonantantennaelementsintothissmallvolumeusingnaturalgeometricalconfigurations[],fractalcurveantennas[],

7、space-fillingcurveantennas[],andstruc-turesgeneratedwithoptimizationapproacheshavealsobeenconsideredsuccessfully[].Inaddition,numerousmatchingnetworkapproacheshavebeenconsideredforESAs(see,forinstance,Chapterof[]).Becausetheyrelyonvariouscombinationsof(circuitandradiating)com

8、ponents,theyallhavebenefitsanddrawbacks.