Abstract

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 ${16} \times {16}$ periodic units, a 10 dB RCS reduction in 18.0–25.5 GHz is achieved.

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