Reflecting Intelligent surfaces (RISs) is a novel technology based on metasurfaces which been recently proposed as a solution for 6G communication networks (see smart propagation environment) and Radar Cross Section (RCS) control. RIS also constitutes a basic element for reconfigurable high-gain antennas like reflectarrays. A RIS consists of a periodic metasurface (2D version of metamaterials) including capacitive elements located at a sub-wavelength distance from a metallic plane. The metasurface cells are loaded with active components (varactor, PIN or schottky diodes) in order to control the phase and the amplitude of the reflection coefficient of each metaatom.

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