RCS reduction property of random coding metasurface
YANG Jiaji;CHENG Yongzhi;GONG Rongzhou;School of Optical and Electronic Information, Huazhong University of Science and Technology;School of Information Science and Engineering, Wuhan University of Science and Technology;
A kind of metasurface based on diffuse reflection and random coding theory was proposed, which could be used to reduce the radar cross section(RCS) reduction, and then simulation and experiments were performed to verify its properties. Firstly, the diffuse reflection and random coding theory were illustrated in briefly, and a linear polarization conversion super-cell based on metal cut-wire structure was designed. This structure could be applied in coded electromagnetic matrix by defining two basic units "0" and "1", respectively, which could achieve a 180° reflection phase difference in a broadband frequency range. The simulation results indicate that the linear polarization conversion rate of the designed structure is up to 90% in the frequency range of 6–14 GHz, and the bandwidth of over 10 d B RCS reduction is greater than 6 GHz. Then, three kinds of random coding metasurface samples were prepared and measured. The experimental results indicate that, in the frequency range of 5.5–13 GHz, the reflectance of the proposed three random coding metasurfaces are all less than –10 d B under normal incidence, and the average RCS reduction is greater than 10 d B, which are agreement reasonably with the simulations. In addition, a considerable RCS reduction was achieved in oblique incident case, which further verifies the excellent RCS reduction properties in a wide incident angle. The designs of random coding metasurface provide a new promising approach for the radar stealth technology.