Suppressing Edge Back-Scattering of Electromagnetic Waves Using Coding Metasurface Purfle

Abstract

Edge scattering is one of the main scattering sources for metal objects, especially for those with thin front edges. In this paper, based on the principle of scattering cancelation, a coding metasurface purfle is proposed and employed to suppress the edge back-scattering of electromagnetic (EM) waves. To this end, two split-ring resonators with a π phase difference between them are designed to act as the 0-and 1-element of the coding metasurface. The coding metasurface fixed on the front edge of a thin metal plate can reduce the edge back-scattering significant for EM waves polarized along the edge direction due to the anti-phase scattering of the two coding elements. Both the simulation and experiment results verify the reduced back-scattering of the flat edge. A maximal reduction of 24 dB is attained within the central frequency of about 11 GHz. This work provides a novel alternative to suppressing edge scattering and may find applications in EM compatibility, radar stealth technologies, etc.

A Review of Metasurface-Assisted RCS Reduction Techniques

“…By contrast, [91] reports the RCS reduction of a cylindrical metal target utilizing a flexible indium-tin-oxidebased ultrathin coding metasurface (less than 0.1 wavelengths thick) with high optical transparency. A phase-quantized coded metasurface was reported in [92], and [93] reports edge backscattering suppression using coded metasurfaces.…”

A Low RCS Design under a Large Incident Angle for the Curved Surface Edge Considering Edge Effects

“…Additionally, other related research includes the use of inhomogeneous anisotropic impedance surface to guide surface waves and suppress scattering from the oblique sides of triangular scatterers [20], as well as the utilization of soft and hard anisotropic impedance surfaces for redirecting backscattering [21,22]. Edge scattering can also be controlled through encoding metasurface units [23,24].…”

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

“…By configuring a specific phase gradient on the surface, reflections or transmissions in abnormal directions can be achieved. Based on phase modulation of the metasurface, beam focusing [ 17 , 18 , 19 ], scattering [ 20 , 21 , 22 ] and beam shaping [ 23 , 24 , 25 ] were realized.…”