Wideband RCS reduction of thin metallic edges mediated by spoof surface plasmon polaritons

The back-scattering from front edge diffraction contributes significantly to mono-static radar cross section under TE-polarization when the specular reflection of an object is eliminated by elaborate shaping. With aim suppress thin metallic edge, we propose achieve wideband (RCS) reduction integrating absorbing structure (AS) in edge. unit cell AS composed a longitudinal array strips with linearly decreasing lengths. Under TE-polarized illumination, spoof surface plasmon polariton (SSPP) can be excited high efficiency. Due deep-subwavelength property SSPP, electromagnetic waves are highly confined around AS, leading strong local field enhancement and hence absorption. In this way, suppressed RCS reduced over wide band. To verify method, designed, fabricated measured prototype. results both simulation measurement indicate that our proposal scattering, whose more than 10 dB achieves at range 8.8–17.8 GHz TE polarization. This work provides new alternative suppressing may find applications compatibility, stealth, etc.