Design and analysis of 2-bit matrix-type coding metasurface for stealth application

Abstract

Aimed at broadband microwave absorption, we present the linear polarization conversion metasurface (MS) by a novel design of a two-bit matrix-type coding method. The coding patterns are applied to a dielectric substrate and a magnetic substrate. The radar cross section (RCS) reduction curves of different matrices can fully verify the independence and correctness of the matrix-type coding method. As shown in simulation, the RCS reduction of 8 dB by a metal pattern with a dielectric layer has been achieved in the frequency range of 6–15 GHz. When the matrix-type coding pattern is placed in the middle of double-layered magnetic absorbing materials (MMs), a 10 dB RCS reduction can be achieved in the range of 8–16 GHz. Besides, the metal patterns can improve the high frequency reflection loss performance and broaden the absorption bandwidth of MMs almost without changing the thickness. The experimental results can nicely reproduce the simulated results. The correlative RCS reduction mechanism is further explored. This model provides a new idea in the design of coding MS, which implicates a potential application in stealth technology.