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This paper proposes novel reflectarray elements by arranging double omega-shaped resonant strips with mirror image for converting a linearly polarized incident wave into a circularly polarized radiated wave. As a design example, a linear-to-circular polarizer reflectarray is presented and also its polarization property of far-field patterns over 12–17 GHz is discussed numerically and experimentally.
This paper proposes new reflectarray elements for dual-polarization and wideband use. These elements provide liner phase property with the same slope characteristics for dual polarization, thereby achieving the desirable reflection phase over wide frequency range. The usefulness of the proposed elements is verified by comparing between the calculated reflection phase for periodic reflectarray and...
This paper proposes an optimization design method to obtain arbitrarily-shaped conductive elements for microstrip reflectarrays. Such arbitrarily-shaped elements are determined by using the genetic algorithm (GA) based on a spectral-domain moment method. The validity of the designed elements is presented by comparing the calculated reflection-phase property for a periodic reflectarray with the measured...
This paper presents single-layer microstrip reflectarray antennas based on triple-resonance behavior and also discusses their broadband characteristics. The reflection phase properties can be evaluated by using infinite arrays of a rectangular cell consisting of three elements with different dimensions. Appropriate three elements for obtaining arbitrary phase value are determined by taking account...
This paper proposes a novel wall configuration, which consists of two spline-profiled tapers and a few coaxial cavities, for obtaining a multimode horn with both a compact structure and wideband characteristics. Such a mixed profile including the coaxial cavities is optimized over the specified frequency range. A compact circular-aperture horn with two coaxial cavities which has good VSWR characteristics...
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