Scattering Characteristics Of Low-Scattering Metasurface

The low-scattering metasurface based on the diffusion principle is composed of subwavelength microstrip units, with randomly-distributed reflection phases. The reflection waves will be scattered into various directions when plane waves are incident upon the metasurface, resulting in significant decrease of the back radar cross section of the metalic targets, which is very important for radar stealth technology. The main work of this paper is as follows:(1) A microwave single-layer low-scattering metasurface working is proposed, which is a more compact in comparison to the multi-layer structure. It is also easy to fabricate, and suitable for conformal applications. The metasurface units can realize the phase range of 360 by tuning the structural parameters of the unit cells. When covered by the metasurface, the scattering energy will be redistributed in nearly all directions, which can greatly lower the detectability.(2) A THz single-layer metasurface is designed and experimentally characterized. To obtain enough phase range, two kinds of subwavelength units are utilized due to the fabrication limitation in THz band. The two units are both composed by an inner ring and an outer ring with four fold rotation symmetry, making it insensitive to polarization of incident waves. The proposed THz metasurface has ultralow scattering pattern which is useful for cloaking applications.