A C-band folded reflectarray antenna using integrated planar 2?2 array feed

The horn antenna is usually used as the primary feeding source in the folded reflectarray antennas. By replacing the classical horn feed with an alternative planar 2×2 array source, a C-band folded reflectarray is realized and presented in this paper. The antenna performance of the final folded reflectarray is characterized by the simulated and measured radiation pattern and antenna gain. The simulated and measured results have confirmed that the proposed folded reflectarray could provide a broadside steering beam with the antenna gain higher than 20 dBi and cover a 4% bandwidth from 4.9 GHz to 5.1GHz, indicating that the utilization of the alternative feed is suitable.