Design and Optimization of a Double Circular Polarization Large Deployable Reflectarray for Direct Broadcast Satellite in S-band
Résumé
This paper presents the design and the optimization of a large deployable reflectarray (RA) in S-band working in double circular polarization. The optimization consists in directly adjusting the rectangular Phoenix cells distribution on the RA layout in order to minimize the residuals on the realized Gain and the cross-polar discrimination (XPD) on a large set of ground stations distributed on three geographic coverage regions. The optimized nine-panels RA shows a continuous and smooth layout. The RA performances on a narrow bandwidth are verified against strict requirements on the coverage areas and on a set of cities. Moreover, a comparison of the optimized RA with respect to a RA obtained through phase only synthesis and a theoretical shaped reflector is presented, showing enhanced performances of the optimized RA.
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