MICROSTRIPLINEANDCPWFEDULTRAWIDEBANDSLOTANTENNASWITHU-SHAPEDTUNINGSTUBANDREFLECTORR.Chair,A.A.Kishk,K.F.Lee,C.E.Smith,andD.KajfezDepartmentofElectricalEngineeringCenterforAppliedElectromagneticSystemsResearch(CAESR)UniversityofMississippiUniversity,MS38677,USAAbstract—Widebandprintedrectangularslotantennasbackedwithreflectorsforunidirectionalradiationpatternsareinvestigated. AU-shaped tuning stub is used to improve the matching. Two differentfeeding mechanisms are introduced. A rectangular slot excited bymicrostriplinefeedwithaU-shapedtuningstubgivesanimpedancebandwidth of 110% (
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Chair et al. (2006) studied this question.
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