RCS evaluation of reflectarray antennas by using the asymptotic technique

The radar cross section (RCS) of a reflectarray antenna is investigated, where the reflectarray antenna is phased to radiate a directional beam focused in the far zone for long-range applications communications or radar system. The RCS is simulated by considering a plane wave illumination on the reflectarray. This study focuses on the RCS investigation of the reflectarray while the effect of feed antenna is excluded for simplification. In particular, the UTD-type decompositions in terms of scattering and diffracted rays are employed to interpret the scattering mechanisms.