Design of thin circuit-analogue multilayer absorber and application to leading edge of wing structure

A new thin multilayer circuit-analogue (CA) absorber design consisting of a patterned resistive sheet, glass/epoxy, and glass/MWCNT-epoxy for X-band radar is presented. The proposed thin multilayer CA-absorber (a total thickness of 2.23 mm) has smaller thickness by 0.71 mm than a single-layer CA-absorber (a total thickness of 2.93 mm). Although the absorption bandwidth of the multilayer CA-absorber in the X-band was slightly narrower than the single-layer CA-absorber, the absorption performance of the multilayer CA-absorber was comparable to that of the single layer. Also, when the CA-absorber was applied to the leading edge of a wing-shaped structure, the radar cross-section level was comparable with the single-layer CA-absorber even though the thickness of the multilayer CA-absorber was less than that of the single-layer CA-absorber.