Design of beam scanning metamaterial antenna

Abstract

A beam scanning metamaterial planar reflective array antenna is designed by combining square and octagonal rings. Compared with the traditional array antenna design, this array antenna adopts a new phase compensation method thus by combining the phase curve obtained by the reflective array unit when the material of the dielectric substrate is different, the phase compensation from 0~360 is realized, so that the phase curve of the array unit need not to completely cover 0~360, and Hermite interpolation way is used to make up for the poor linearity of the phase characteristics. The advantage of this method is its universality, which reduces the design requirements for the array unit. Using this method, several single-layer plane reflectarray antennas were designed. The simulation results show that the direction of the reflected beam is consistent with the expected setting, and the side lobe and the main lobe are at least 15 dB apart. By adjusting the range of the solid-state plasma excitation region of the metamaterial to change the resonance structure of the array unit, beam scanning in different spatial frequencies is achieved, which provides a new method for the design of the planar reflectarray antenna.