Dual frequency circularly polarised microstrip antenna

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1、DualfrequencycircularlypolarisedmicrostripantennaR.Shavit,Y.Israeli,L.PazinandY.LeviatanAbstract:Adualfrequencyanddualcircularpolarisationmultilayermicrostripantennaelementforsatellitecommunicationispresented.Theelementisfedbyagap-coupledprobepin.Themicrostripelementexhibi

2、tsadualfrequencybandofoperationfortwoorthogonalcircularpolarisations.Aparametricstudytooptimisetheelementperformancehasbeenconducted.Aprototypewithdimensionsthatarebasedonthesimulationshasbeenbuiltandtested.Agoodagreementbetweenthemeasuredandnumericalresultswasfound.1Intro

3、ductionMicrowaveStudio(MWS)commercialsoftwarefromComputerSimulationTechnology(CST),whichisbasedMicrostrippatchantennaelementsareverypopularinonthemethodoffiniteintegraltimedomain(FITD)wirelesscommunicationsystemapplications.Theyofferanalgorithm.AprototypeoftheelementinKuban

4、dhasbeenattractivewaytointegratetheRFfrontendofthesystembuiltandtested.Theagreementbetweenthecomputedandwithitsantennaandachievealowprofile,lowweight,easytheexperimentalresultswasgood.tofabricateandlowcostsolution.Theincreaseddemandforhighertransmissioncapacityisdrivingther

5、esearchto2Theelementdesigninvestigatenewwaystoincreasethemicrostripantennabandwidthor,alternatively,operateinmultiplefrequenciesThebasicstructureoftheproposedelementoperatinginwhileusingtwoorthogonalpolarisations.ThisrequirementtwoKufrequencybandsandtwoorthogonalcircularmo

6、tivatedourresearchtolookforadualfrequencyandpolarisationsisshowninFig.1.TwostackedcirculardualcircularpolarisationantennaelementforKubandpatchesarefedintandembyasinglepin.Eachpatchissatellitecommunications.Therearenumerouswaystocoupledtothefeedingpinthroughanannulargap.Thi

7、sobtainadual-bandcircularlypolarisedprintedantennaasuniquetypeoffeedingisnecessaryinordertointroduceadescribedin[1–4].However,inalltheabovecasesthesamecapacitiveeffecttocounterbalancetheinductiveeffectofthesensecircularpolarisation,right-handcircularpolarisationfeedingpin.

8、Thefeedingpinistoploadedwithalittle(RHCP)orleft-handcircularpolarisation(LHCP),wascircula