Suppression of Specular Reflections by Metasurface with Engineered Nonuniform Distribution of Reflection Phase

Abstract

We make preliminary investigations on a new approach to reducing radar cross section (RCS) of conducting objects. This approach employs novel planar metasurfaces characterizing nonuniform distribution of reflection phase. The operation principle of this approach and the design rule of the associated metasurfaces are explained using a simplified theoretical model. We then present a design example of such metasurfaces, in which three-layer stacked square patches with variable sizes are utilized as the reflecting elements. The proposed RCS-reduction approach is verified by both numerical simulations and measurements on the example, under the assumption of normal plane wave incidence. It is observed that, in a fairly wide frequency band (from 3.6 to 5.5 GHz), the presented example is capable of suppressing the specular reflections of conducting plates significantly (by more than 7 dB) for two orthogonal incident polarizations.

A Wideband and Polarization-Independent Metasurface Based on Phase Optimization for Monostatic and Bistatic Radar Cross Section Reduction

“…In 2015, Chen et al [8] proposed a hexagonal checkerboard surface of periodic fashion, with the −10 dB monostatic RCS reduction bandwidth of about 61%, which can create six bistatic RCS lobes, leading to further bistatic RCS reduction (8.9 dB). In [9] Yang et al proposed a metasurface with nonuniform phase distribution for suppression of specular reflections, with the −7 dB RCS reduction bandwidth of about 42% for -polarized and -polarized incident waves. In addition, metamaterial absorber has been proposed as another way to achieve RCS reduction [10,11].…”

Ultra-wideband, Wide Angle and Polarization-insensitive Specular Reflection Reduction by Metasurface based on Parameter-adjustable Meta-Atoms

“…More recently, coding or digital metamaterial/metasurface has been proposed for wideband RCS reduction 20 21 22 23 24 25 26 27 28 . The design process is divided into two independent steps.…”

Broadband diffusion metasurface based on a single anisotropic element and optimized by the Simulated Annealing algorithm

“…In order to suppress these lobes, a metasurface that can scatter the incoming energy in all directions is required. Recently, this goal has been achieved by the metasurface with randomly arranged layout 17 18 19 20 . In refs 17 , 18 , 19 , diffusion metasurfaces are developed by using units of various dimensions.…”