This paper presents the analysis of metasurfaces, here called reconfigurable
intelligent surface. The analysis is performed by numerical simulations that
implement the finite-difference time-domain method. The metasurface has been
modeled by metallic patches interconnected by varactor diodes. The
electromagnetic source consists of randomly generated plane wave. This kind of
analysis allows us to investigate the response of the metasurface when it is
hit by a random source.Comment: Accepted in EMC Europe 202