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The design of a novel ultrawideband printed-circuit antenna is presented. By using a stepped-patch in combination with multiple resonating elements, a bandwidth of more than 150% is obtained. The performance is demonstrated through measurements and calculations with a commercially available field solver. A phase center analysis shows very small variations over the entire available bandwidth. [ABSTRACT FROM AUTHOR]

For the purpose of providing initial designs of waveguide cross-slot couplers, the authors present a simplified analysis of cross-slot coupling through the common broad wall of two rectangular waveguides. Straightforwardly implementable equations are presented which not only include a wide range of cross-slot dimensions but also the location as well as the rotation of the cross-slot in a coupler environment. Moreover, asymmetric coupler structures can be easily incorporated. Analyses of individual structures are verified by HFSS. Two examples of cross-slot waveguide couplers demonstrate the applicability of this technique for the initial design of waveguide cross-slot couplers. [ABSTRACT FROM AUTHOR]