Manipulation of backscattered EM-waves using 1-bit coding reflective surface at mmWave

Abstract

This paper presents the design of 1-bit low scattering reflective surface that can efficiently manipulate the shape and level of the backscattered RCS far-field pattern of a metal object at millimeter wave. The proposed 1-bit surface is designed based on reflection phase cancellation principle where the proposed unit cell of a modified Venus-like shape metallic resonator (as “0” element) and its mirrored-unit cell (as “1” element) are randomly distributed across the surface aperture to realize the required phase difference. The proposed surface can scatter (diffuse) the incident EM-wave into several low level lobes in many directions in the half space in front of the surface, and as a result, dramatically reduce the backscattering and RCS. The proposed surface has good backscattering characteristics under both normal and oblique incidence of EM-waves.