Shape-Optimized Edge Scattering Control With Customized RCS Reduction Magnitude and Bandwidth

This paper proposes a shape-optimized electromagnetic edge scattering suppression framework, enabling customized control of both the monostatic radar cross section (RCS) reduction magnitude and the operational bandwidth. Rooted in the method of equivalent edge currents (EEC), backward edge diffraction from aircraft-like conducting edges under oblique TE and TM polarization is analytically modeled as a summation of discrete phasors determined by geometric path differences. By discretizing the edge into height-varying segments, a compact closed-form expression for the relative monostatic RCS reduction is derived. The proportionality coefficients of these segments are synthesized via a Dolph–Chebyshev procedure to generate an equiripple frequency-domain envelope, enabling predictable, design-oriented manipulation of both monostatic RCS reduction magnitude and bandwidth without iterative optimization. To validate the method, a shape-optimized serrated-edge prototype “Structure IV” was designed and fabricated with a target monostatic RCS reduction magnitude of 12 dB. Measurements conducted in a microwave anechoic chamber confirm the agreement with theoretical calculations and full-wave simulations over 3.3-40 GHz. Moreover, the prototype maintains stable backward scattering suppression under wide-angle oblique polarized incidence (20°θi< 90°), demonstrating excellent angular stability and practical applicability for low-observable platform designs.