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1、ANovelMethodforDesigningDual-FrequencySlotPatchAntennaswithTwoPolarizationsWUDi1,OHISHIBASHIHidekazu2,SEOKazuyuki2,INAGAKINaoki3(1.DepartmentofCommunicationEngineering,ShanghaiUniversity,Shanghai,China;2.KojimaR&DCenter,KojimaPressIndustrialCoLtd,Aichi470—0207,Japan;3.NagoyaInstituteofTechnology,
2、Nagoya466—8555,Japan)Abstract:Thispaperpresentsanewmethodfordesigningadual-frequencypatchantennawithcircularandlinearpolarizations.Dual-frequencyoperationsarebehavedbyetchingtwonarrowslotsclosetotheradiatingedgesofarectangularpatch.Thecircularpolarizationatthelowerresonantfrequencyofthedual-frequ
3、encyantennacanbeachievedbysettingaperturbationsegmentatanappropriatelocationinthepatchelement,andplacingthefeedpointonthediagonalaxis.Severalexperimentalresultsofadesignedantennashowthegoodcharacteristicsforcircularandlinearpolarizationsatbothresonantfrequencies.CLCnumber：TN821.1Documentcode：AKey
4、words:dual-frequency;slotpatchantennas;linearpolarization;circularpolarizationInradarandcommunicationsystems,dual-frequencyoperationsareoftenrequired.Specially,inmodernmobileglobalpositionsystem(GPS),itwillbedesirablethatoneoftwofrequenciesisthecircularpolarization.Planarantennahasbeeninvestigate
5、dformulti-frequencyverywellsinceitisadvantageousinlowcost,lowweightandconformability.Earlydual-frequencyplanarantennaismultilayeredstacked-patchstructure,andtheradiatingelementisusedtobecircular[1],annular[2],rectangular[3]andtriangularpatches[4].Recently,adual-frequencyantennaisintroducedinwhich
6、thestructureisdinglelayerpatchwithtwoslotsclosetotheradiatingedges,andgoodperformancesofsimultaneousimpedancematchingandgainaredemonstratedforbothresonantfrequencies.However,alltheconventionalinvestigationsareonlyforthecaseinwhichtheantennapolarizationislinear,whilethedual-frequencyantennawithcir
7、cularpolarizationhasnotbeentouchedyet.Inthispaper,wepresentadesignmethodofadual-frequencyantennawithcircularandlinearpolarizationsbasedontheconventionalinvestigationforthedual-frequencylinearpolarizationantenna[5～7],Tw
