Beam pattern reconfigurable circularly polarized transmitarray antenna by rearrangement of sources

Abstract

A novel method for a beam pattern reconfigurable circularly polarized (CP) transmitarray antenna based on passive metasurface is proposed by a rearrangement of source antennas. Two source antennas among eight source antennas are selected for the fine beam steering. The beam steering angle can be finely controlled by the positions and phase difference of the source. Moreover, this kind of transmitarray antenna can be utilized to generate multibeam by the combination of the source antennas for radiation to different directions. To verify its feasibility, the planar CP source antenna is designed to operate at 5.8 GHz. Also, the metasurface consists of four layer separated by four substrates to cover full transmission phase variation of 2 pi, and the metallic layers are designed to circular patches. As a result, the steering angle is experimentally observed at each 0, +20, and +40 degrees, and dual beam radiating to -30 and +30 degrees also is measured.