Malposed spoof surface plasmon structure with enhanced microwave absorption and compressive performances realized by carbon-based foams

摘要

In this paper, a malposed spoof surface plasmon (SSP) structure filling by carbon-based absorbent poly-methacrylimide (PMI) foams is proposed, which realizes the bi-function of broadband electromagnetic (EM) wave absorption and mechanical enhancement properties. The malposed SSP structure is first designed to accomplish high-performance absorption at lower radar frequencies, whose 10-dB level absorptivity is obtained at the range of 4.8-10.2 GHz. After filling carbon-based PMI foams in the interior of hollow SSP structure, the effective absorption bandwidth can be extended largely to 18 GHz. Moreover, the measured results in the mechanical compressive experiment show that the compressive strength σ_(peak), energy absorption per unit volume W_v and energy absorption per unit mass W_m of the proposed foam-filled SSP structure can reach to 45.4 MPa, 13.57 × 10~3 KJ/m~3 and 38.84 KJ/Kg, respectively, with the density only 0.35 g/cm~3, which are more competitive comparing with many metallic sandwich core topologies. It is sure that the broadband microwave absorption performance and enhanced compressive property make our design more multifunctional, and have potential application in the practical stealth designs.