A metasurface with shared perforating holes for ultra-wideband RCS reduction

In this paper, a novel metasurface with shared perforating holes is proposed. The metasurface consists of two types of meta-surface units. The shared perforating holes of adjacent units are realized on the covering layer using the periodic property of the metasurface unit which contributes to widening the operating bandwidth of the unit. To satisfy the periodicity condition, 4 × 4 units are formed into a subarray. Then, for the first time, Genetic Simulated Annealing Algorithm (GSAA) and Convolutional Operation (CO) are used simultaneously to optimize the distribution of the subarray. The optimized meta-surface leads to a wider radar cross section (RCS) reduction bandwidth and more dispersed scattering patterns. The measured result shows a 10 dB RCS reduction observed for 126% of the relative bandwidth (8.2–36.4 GHz). The proposed strategy provides a new idea for the meta-surface to realize ultra-wideband RCS reduction.