schantz bottom fed planar elliptical uwb antennas (ieee uwbst 2003)外语英文电子书

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1、Copyright©2003IEEE.ReprintedfromTheProceedingsofthe2003IEEEUWBSTConferenceThismaterialispostedherewithpermissionoftheIEEE.Internalorpersonaluseofthismaterialispermitted.However,permissiontoreprint/republishthismaterialforadvertisingorpromotionalpurposesorforcreatingnewcollectiveworksforresaleo

2、rredistributionmustbeobtainedfromtheIEEEbywritingtopubs-permissions@ieee.org.Bychoosingtoviewthisdocument,youagreetoallprovisionsofthecopyrightlawsprotectingit.http://www.uwbantenna.comBOTTOMFEDPLANARELLIPTICALUWBANTENNASHansGregorySchantz(h.schantz@ieee.org)Next-RF,Inc.4811CoveCreekDriveBrown

3、sboro,AL35741ABSTRACTThispaperdescribes“bottomfed”planarellipticaldipoles.Theseantennasareelectricallysmallultra-wideband(UWB)dipoleswithbandwidthsontheorderof3:1orbetter.Returnlossistypically–14dB,andboresightgainisnominally3dBi.Bottomfedplanarellipticaldipoleantennasarewellsuitedforcommercia

4、lapplications.1.INTRODUCTIONAntennasforultra-wideband(UWB)usemustmeetdemandingperformancespecifications.Theymustbewell-matchedandefficienttotakebestadvantageofparsimoniousspectrallimits.Ideally,UWBantennasFigure1:Prototype“bottom-fed”planarellipticaldipoleshouldbenon-dispersiveordispersiveinac

5、ontrolledantenna,front(totheleft)andback(totheright).fashionthatisamenabletocompensation.ForawideTheaimofthispaperistopresentasolutiontothesevarietyofapplications,anomni-directionalresponseisproblems:ameansfor“bottomfeeding”planarellipticalhighlydesirable.Commercialoperationimposesdipoles[4].I

6、naddition,thisbottom-fedplanarellipticaladditionalconstraints.AmassmarketUWBantennamustdipoleincorporatesabaluntransformertohelpimprovebesmallandinexpensive,yetmustnotcompromiseonmatchingandreduceundesiredcablecurrents[5].performance.Planarellipticaldipolesperformwellincommercial2.OPERATIONapp

7、lications[1].Theyallowmatchingwithreturnlossontheorderof–15dBorbetter.DespitetheirplanarformFigure1depictsaprototypebottomfedUWBplanarfactor,theyalsoexhibitnearomni-directionaldipole-likedipoleantennadesignedtoradiateandreceiveUWBpatter