Surrogate-Assisted Design of Checkerboard Metasurface for Broadband Radar Cross-Section Reduction

Metasurfaces have been extensively exploited in stealth applications to reduce radar cross section (RCS). They rely on the manipulation of backward scattering electromagnetic (EM) waves into various oblique angles. However, arbitrary control properties poses a significant challenge as design task. Yet it is principal requirement for making RCS reduction possible. This article introduces surrogate-based approach rapid optimization checkerboard metasurfaces. Our methodology involves fast metamodels, and combination surrogate-assisted global with local, gradient-based tuning. It permits an efficient EM wave reflection characteristics, ensures arriving at that globally optimum solution within assumed parameter space. The procedure fully automated. framework employed develop novel broadband metasurface, where fundamentally based carefully controlled by simultaneous adjustment unit cell dimensions. structure are demonstrated using simulated monostatic bistatic RCSs. proposed metasurface exhibits 6 dB frequency range from 16 37 GHz. numerical results validated physical measurements fabricated prototype. Experimental data indicates relative bandwidth 83 percent, which makes outperforming designs reported literature.