Broadband circularly polarized reflectarray antenna using metasurface polarizer

A broadband circularly polarized (CP) reflectarray antenna is proposed. By removal of the four corners of the finite square reflectarray, radiation from surface wave on the array is reduced at the corners. As a result, the 3-dB axial ratio (AR) bandwidth of 27% can be obtained at the center frequency. Furthermore, a design way to control the surface wave by keeping the ground plane square is presented. Due to its principle, the proposed modification of the metasurface can be effective not only for the proposed antenna, but also for other antennas with metasurface.