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1、AbstractAbstractWiththeincreasingrequirementsforRadarAnti-jammingPerformance,thedevelopmentofthepulsedDopplerradarandtheapplicationsofthevisualmeteorologicalradar,antennasarerequiredanarrowbeamorshapedbeam,andaloworverylowsidelobeperformance.Waveguideslotantennah
2、asbeenwidelyappliedinthemissile-borneandairborneradarequipment,etc,foreasytocontroltheorofacialdistribution,highradiationefficiency,compactstructure,reliableperformance,easytoimplementalowsidelobenarrowbeamorUltra-LowSidelobe,andmanyotheradvantages.Inaddition,wit
3、htherapiddevelopmentofmoderncommunicationtechnology,theworkenvironmenthasbeenbecomingmoreandmorecomplex,whichproposeshigherrequirementsforcircularlypolarizedantennaperformanceanditsanti-jammingcapability.Therearemanytheoriesandapproachesforwaveguideslotarrayanten
4、nadesign,butmostofthemaredevelopedforlinearlypolarizedarrays.Sohowtodesignawaveguideslotarrayantennaforcircularlypolarizedradiationisthefocusofthispaper.Inthefirstpartofthispaper,thebasictheoriesofwaveguideslotarrayantennaareintroduced,includinghowtoanalyzethewav
5、eguideslotantennaequivalentcircuit,howtoobtaintheequivalentconductanceformulasandhowtodesignthewaveguideslotarrayantenna.Thenthepolarizationcharacteristicsoftheantennaarepresented.Underguidanceoftheabovetheories,fivewaveguideslotelementsaredesignedwhichhavebothci
6、rcularlypolarizedradiationandgoodaxialratiocharacteristics.Andforthefeasibilityfortheseelementstoworkasanantennaarray,twoofthewaveguideslotmodularformsarechosentorealizeabroadsidecircularlypolarizedwaveguideslotarraywith98elements.Accordingtothesimulationresults,
7、theaxialratiobandwidthfortheantennaarraywithdipole-circularpolarizerisnarrow,lessthan50MHz.Whiletheaxialratiofortheantennaarraywithwaveguide-circularpolarizerislessthan2.5dBfrom9GHzto9.5GHz.,themainbeamwidthislessthan1.6°andthesidelobeislessthan-25dBwhichmeetther
8、equirements.Finally,awaveguideslotplanararrayisdesignedandanalyzed.thesimulationsresultsindicatesthemaximumvalueoftheaxialratiois2.17dBduringthewholeoperatefre
