Design, simulation and fabrication of Dual-Band Reflectarray Antenna with Orthogonal Polarization in X and Ku Bands

In this paper a novel single layer dual band reflectarray antenna with orthogonal polarization in X and Ku bands for satellite communication is proposed. The planar reflectarray prototype is fabricated and the results are compared with those of simulations and discussed. The unit cell consists of dual split rectangle loops for lower band frequency at 11. 5 GHz and gradually decreasing dipoles for upper band at center frequency of 14 GHz. Both of the designed elements have more to 6000 phase variation that achieved by varying the length of the each elements. A thin dielectric substrate of thickness 0. 8mm placed above an air layer of 2mm is used. The reflectarray is center fed by a linearly polarized pyramidal horn antenna. The X band elements have -1dB gain bandwidth of about 17. 4% covering 11-13 GHz and the Ku band has about 13% bandwidth covering 12. 7-14. 5 GHz. The measured antenna gain at 11. 5 GHz is 23. 9 dB and at 14 GHz is 26. 1 dB showing aperture efficiency of 41% and 45%, respectively.