Coding Metasurfaces for Diffuse Scattering: Scaling Laws, Bounds, and Suboptimal Design

摘要: Coding metasurfaces, based on the combination of two basic unit cells with out-of-phase responses, have been subject many recent studies aimed at achieving diffuse scattering, potential applications to diverse fields ranging from radar-signature control computational imaging. Here, via a theoretical study relevant scaling-laws, physical mechanism underlying scattering-signature reduction is elucidated, and some absolute realistic bounds are analytically derived. Moreover, simple, deterministic suboptimal design strategy introduced that yields results comparable those typically obtained by approaches brute-force numerical optimization, negligible fraction their burden, thereby paving way structures arbitrarily large electrical size. Results corroborated rigorous full-wave simulations microwave experiments, may be interest in variety application fields, such as low-scattering targets illumination apertures for imaging, not necessarily restricted electromagnetic scenarios.