Multiple Diffuse Coding Metasurface of Independent Polarization for RCS Reduction

Abstract

In this paper, a multiple diffuse coding metasurface (MDCM) of independent polarization is designed to control the propagation direction of diffuse reflections under different polarizations and to improve the monostatic and bistatic RCS (radar cross section) reduction effect. First, a method for controlling the distribution range and propagation direction of the diffuse field is studied, and the diffuse field distribution of the random phase metasurface is optimized by a genetic algorithm to improve the uniformity of the diffuse scattering distribution. Then, the random phase distribution is superimposed on the periodic gradient phase distributions of the linear and hedge types in the orthogonal direction so that the main propagation direction of the diffuse metasurface deviates from the specular reflection region under different polarizations, showing single and two diffuse beams. Finally, the anisotropic unit cell with a rectangle inside and an improved Jerusalem cross on the outside is employed as the basic coding element of the MDCM due to its independent polarization phase response. The numerical and experimental results show that the MDCM features multiple diffuse scattering, independent polarization and angle insensitivity and can efficiently improve the monostatic and bistatic RCS reduction effect simultaneously. Because the scattered energies are redirected away from the specular reflection direction, the specular scattering reduction effect is better than the isotropic diffuse metasurface. The proposed method increases the difficulty of detection by single or netted radar and has the potential for the applications of stealth techniques.

An Ultra-Wideband Circular Polarization-Maintaining Metasurface and Its Application in RCS Reduction

“…Table 1 lists the comparison of the coding metasurface with previous works presented in Ref. [35][36][37][38][39][40][41], it is indicated that the coding metasurface can achieve much wider band RCS reduction, so it has great potential in radar stealth technology application.…”

“…It can work as a reflective phased array antenna, its far-field scattering pattern can be controlled by the predesigned coding sequence, so it can achieve Radar Cross Section (RCS) reduction by optimizing the coding sequence. In recent years, to realize wideband RCS reduction, a number of different coding metasurfaces have been proposed [35][36][37][38][39][40][41] .…”

A 2-Bit Pancharatnam-Berry Coding Metasurface for Ultra-wideband and Polarization Insensitive RCS Reduction

“…In 2014, a concept of coding metasurface was firstly proposed by Cui et al, [16] which consist of several different types of coding elements with much different reflection phases, it can work as a reflective phased array antenna, and the array pattern can be represented by a coding sequence, so its far-field scattering pattern can be controlled by the predesigned coding sequence, and according to a proper coding sequence, the anticipated RCS reduction can be realized due to phase cancellation. In recent years, to realize wideband RCS reduction, a number of different coding metasurfaces have been proposed [17][18][19][20][21][22][23][24][25][26][27].…”

Design of QR-Coded Metasurfaces for RCS Reduction at mmWave

“…Diffusion of backscattered electromagnetic (EM) waves and radar cross section (RCS) reduction of objects using metasurface have received a lot of attention among researchers in recent years [1]- [8]. Metasurfaces are the 2D version or counterparts of the 3D metamaterials which are usually composed of an array of sub-wavelength dimensions metallic or dielectric resonators [13]- [14].…”