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

Abstract

In the context of the backscatter problem caused by edge diffraction on metallic curved surface, this study proposes a method to mitigate the scattering effect by loading different metasurface structures in four equally divided regions along the surface edge. Based on the design of the loaded metasurface on the curved surface, the interaction between the reflection field on the surface and the diffracted field is regulated by adjusting two key parameters: the reference phase (φ0) at the edge and the phase difference (φ d ) in adjacent regions. By controlling these parameters, reduction in the monostatic radar cross-section (RCS) can be achieved when the metasurface is loaded onto the curved surface. By controlling the reflection phase of a sandwich-like unit structure subjected to oblique incidence of electromagnetic waves, a metasurface that meets the requirements has been designed. Through a comparison and analysis of the near field and monostatic radar cross-section before and after loading the metasurface, the effectiveness of this design method is confirmed. This method is of great significance to control the electromagnetic scattering caused by edge diffraction.