Dual-Band Flat-Top Pattern Synthesis Using Phase Gradient Metasurface

Abstract

This paper presents a metasurface (MTS) to generate a flat-top pattern using phase compensation method. The proposed flat top pattern is realized by diving the entire MTS into four sub regions which directs the beam in different directions. The metasurface is designed with an array of 15x15 unitcells where each unitcell comprises of an four-layered elliptical patch surrounded by a square ring. The beam pointing angle for each sub region is optimized to achieve nearly constant gain throughout the desired angular section. The simulation results show a flat-top pattern with a ripple factor less than 1 dB in the interval [−15° to15°] at the designed frequency of 10 GHz and 12 GHz.