Design of Filtering Folded Reflectarray Antenna Through Exploiting Its Main Reflectarray

The design method of the filtering folded reflectarray antenna (FRA) through exploiting its main reflectarray is presented for the first time in this paper. Firstly, two novel reflective surface elements with high frequency selectivity and polarization conversion properties are introduced, including a single-layer vialess reflective surface based on the dual-mode ring resonator and a multilayer vialess reflective surface based on the filtering antenna technology. Then in order to verify the proposed FRA design method, an antenna prototype has been designed as the example. For simplicity, 1-bit phase compensation of the main reflectarray is done to realize the high-gain radiation beam. Good simulated results of the proposed antenna have been observed, which validate the proposed design method. Furthermore, some discussion on the simulated results of the proposed antenna design has been provided.