Broadband Beam Control Using Non-Resonant Metasurface

Compare to conventional metasurface element structure based on resonant structure element, non-resonant mode can largely increase the working bandwidth. Based on this principal, we propose a method to realize the transmission type phase gradient metasurface using a non resonant mode patch, which is based on treating the patch in the element as a pixel and obtaining the phase difference by setting the pixel to empty or full. A design example is given to control the beam direction with a bandwidth of more than 40%.