Non-resonant broadband RCS reduction based on the patch distribution of a phase gradient metasurface

Three units consisting of five, nine, and one square patches are used to construct a phase gradient metasurface with a 2 pi phase distribution within 18.0-28.0 GHz. The three units arranged in one-dimensional (1D) and two-dimensional (2D) directions can precisely control the reflection beam direction in the plane of phase gradient. Rotating 1D and 2D phase gradient directions can convert a single reflected wave into multi-angle low-energy beams, forming the radar cross section (RCS) reduction metasurface. Using 16 x 16 periodic units, a 10 dB RCS reduction in 18.0-25.5 GHz is achieved. (c) 2023 Optica Publishing Group