RCS Reduction Using 2-bit Coding Metasurface With Anisotropic Unit Cell and Random Phase Distribuin

Abstract

The design of single layer 2-bit coding metasurface for radar-cross-section (RCS) reduction from 13 – 22 GHz is proposed in this paper. The proposed metasurface is constructed using four anisotropic Pancharatnam-Berry (PB) coding elements based on an E-shaped metallic resonators. The 2-bit reflection phase states “00” (0°), “01” (90°), “10” (180°), and “11” (270°) were generated by rotating the E-shaped metallic resonators. The RCS reduction mechanism is achieved by randomly distributing the four coding states of the 2-bit sequence across the proposed metasurface aperture. The RCS reduction is achieved by strongly diffusing and redirecting the reflected energies to all angles in the space in front of the proposed 2-bit metasurface. The simulated results show that the proposed 2-bit metasurface maintaining more than 10 dB of RCS reduction from 13 GHz to 22 GHz. The RCS reduction fractional bandwidth (FBW) under normal incidence of CP plane wave is 51.4%, compared to a bare metal plate with the same size. Currently, the proposed 2-bit metasurface prototype is being fabricated, and the measured RCS scattering results will be presented during the conference session.