In this paper, a malposed spoof surface plasmon (SSP) structure filling by carbon-based absorbent polymethacrylimide (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 × 10³ KJ/m³ and 38.84 KJ/Kg, respectively, with the density only 0.35 g/cm³, 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.

本文提出了一种由碳基吸收性聚甲基丙烯酰亚胺（PMI）泡沫填充的恶臭欺骗表面等离子体（SSP）结构，该结构可实现宽带电磁（EM）波吸收和机械增强特性的双重功能。错位的SSP结构首先被设计为在较低的雷达频率下实现高性能吸收，在4.8–10.2 GHz范围内可获得10 dB的电平吸收率。在中空SSP结构内部填充碳基PMI泡沫后，有效吸收带宽可大大扩展到18 GHz。此外，测得的结果在机械压缩实验表明，该抗压强度σ_峰，每单位体积的能量吸收w ^ _v所提出的泡沫SSP结构的单位质量W _m和能量吸收能分别达到45.4MPa，13.57×10 ³  KJ / m ³和38.84KJ / Kg，密度仅为0.35g / cm ³，分别为与许多金属夹心芯拓扑相比更具竞争力。可以肯定的是，宽带微波吸收性能和增强的压缩性能使我们的设计更具多功能性，并在实际的隐形设计中具有潜在的应用前景。