Wideband microwave radar cross section reduction by orientation distributed digital metasurfaces

This paper presents a novel design of orientation distributed digital metasurface for suppressing backward radar cross section (RCS) with a broad working bandwidth. A corrugated meander line is proposed as the constitutive unit cell which is capable of creating 1-bit (with two orientations of 0° and 90°), 2-bit (with four orientations of 0°, 45°, 90° and 135°) and multi-bit elements by different orientations with respect to the geometrical center. Each element shows a different reflected phase response to the incident electromagnetic waves, thus metasurface arranged with disordered digital elements will have randomly distributed phase shifts at the interface, leading to a diffusion of backscattering. Thereby, the RCS of the metasurface is substantially suppressed. As verification, full wave simulations have been carried out.