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1、IEEETRANSACTIONSONELECTROMAGNETICCOMPATIBILITY,VOL.45,NO.1,FEBRUARY200355AnalysisandSimulationofa1–18-GHzBroadbandDouble-RidgedHornAntennaChristianBruns,StudentMember,IEEE,PascalLeuchtmann,Member,IEEE,andRuedigerVahldieck,Fellow,IEEEAbstract—A1–18-GHzbroadbanddouble-ridgedhornantenna
2、the-field-modelarenotsuitableforpredictingaccuratelywithcoaxialinputfeedsectionisinvestigated.Fortheridgedhornenough,e.g.,thecurrentdensitieswithintheridgehornantennaantennaitisfoundthattheradiationpattern,contrarytocommonoritsradiationcharacteristics[7],[8].Thesemethodsaretoabelief,
3、doesnotmaintainasinglemainlobeinthedirectionofthehornaxisoverthefullfrequencyrange.Instead,atfrequencieslargeextentsemi-analyticalandrequiresignificantsimplifica-above12GHz,themainlobeintheradiationpatternstartstosplittionsoftheantennageometrybeforetheycanbeapplied(e.g.,intofourlarge
4、sidelobespointinginoff-axisdirectionswithadiptheyarenotcapableofincludingthecoaxialfeednetwork).ofupto6dBbetweenthemalongthemainaxis.AlthoughthistypeBroadbandridgedhornsarestandardcomponentsthatcanbeofhornisthepreferredtestantenna,whichisincommonuseforboughtofftheshelffromdifferentan
5、tennamanufacturers.How-overfourdecades,noexplanationforthisunwantedbehaviorwasfoundintheopenliterature.Toinvestigatethisphenomenoninde-ever,regardlessofthemanufacturer,all1–18-GHzridgedhorntail,amethodofmomentsapproachhasbeenadoptedtosimulateantennasinvestigatedbytheauthorsexhibiteda
6、similardete-thecompleteantennasystem.Thesimulationsareingoodagree-riorationoftheradiationpatternoveralargerangeofhighermentwiththemeasurementsoverthe1–18-GHzoperationalband-frequencies:Whilesweepingthefrequency,suddensignificantwidthandindicatethattheuseofthistypeofhornantennainEMCga
7、inreductionsonthecenter0axisaswellasotherstrongpat-applicationsremainsquestionable.terndeformationsweremeasuredwithoutanyapparentreason.IndexTerms—Broadbandridgedhornantenna,methodofmo-ments,radiationpatterndeterioration.Theseproblemsarenotmentionedinanymanufacturer’sdatasheet,instea
8、dtheantennas
