Abstract-In this paper, the design of a circular corrugated horn antenna is presented for low sidelobe-level. The basic requirement of this design is compactness. Therefore, we use corrugated Gaussian profiled horn antennas to improve the size and sidelobe level simultaneously. Because of compact design of this horn, it is not expected to have a good symmetry in E and H planes. The obtained radiation patterns are sufficient for desired applications. The proposed corrugated antenna has a longitudinal section composed of a normal corrugated horn, some straight corrugations, and a Gaussian profile to complete transition between waveguide and the free space.

In this paper, properties of three types of Circular Polarization Selective Surface (CPSS) cells including Pierrot, Morin, and Tilston, for using in dual circular polarization reflectarray antenna design are investigated. First they are designed for a center frequency about 10 GHz, and circular polarization properties including Reflection Loss, Transmission Loss, Reflected Axial Ratio, and Transmitted Axial Ratio are calculated and presented. Finally, reflection phase curves are presented, and the comparison between simulated properties is accomplished. Simulations show that Tilston cell is more optimum in dual circular polarization reflectarray antennas.