Optimization of wideband RCS reduction via controlled phase and amplitude in metasurface design

In this study, we introduce a strategy for constructing an absorptive metasurface, which integrates the absorption and phase cancellation mechanisms. Through topological optimization and the synthesis of a checkerboard metasurface array, we achieve a significant reduction in ultra-wideband RCS. A prototype of the suggested design is produced and tested to confirm the effectiveness of the absorptive coding metasurface. When compared to a metallic plate of the same dimensions, a notable decrease in reflection is observed within the 4.0–12.0 GHz range. The RCS reduction exceeds 15 dB within the same frequency range (the fractional bandwidth is 100%). The proposed methods of phase and amplitude control, along with topological optimization, prove to be efficient strategies for wideband RCS reduction applications.