Continuous Asymmetric Beam Steering with a Reconfigurable Intelligent Surface in the Ka-Band at 31 GHz

We present a reconfigurable metasurface for continuous asymmetric beam steering based on a patch antenna unit cell. A switching element in the unit cell allows for continuous phase shifting of the reflected wave between 0° and 180°. This continuous phase adjustment enables asymmetric far-field beam shapes with a global maximum at any desired deflection angle up to 65°. We experimentally implement such a RIS module and demonstrate beam steering of a normally incident beam.