Homogeneous Two-Layer Structures for Broadband and Wide-Angle RCS Reduction

A two-layer stacked resonance absorber is proposed to achieve broadband and wide-angle radar cross section reduction. The most prominent structure feature is its simple geometry, which comprises two homogeneous dielectric slabs only. The two slab heights are chosen as one-sixth of a guided wavelength to form a three-way cancellation mode via interface reflections while a high permittivity dielectric is used to achieve low profile. The total thickness is less than 0.1 lambda(L). Because it involves no periodic structure, both monostatic and bistatic scattering levels can be suppressed in a broad frequency band and a wide angular region. A bouncing ray-based high-frequency method was developed to perform parametric studies and design optimization in a timely fashion. Measured and simulated results are compared in spectral and angular domains. An 83% 10 dB RCS reduction band is observed. More than 10 dB back scattering suppression is achieved up to +/- 75 degrees from the surface's normal.