Tailored Multi‐Scale and Flexible Metamaterial for Broadband Electromagnetic Wave Absorption and Infrared Stealth

ABSTRACT Radar‐infrared compatible stealth materials are widely used in applications such as electromagnetic protection and infrared thermal surveillance. However, harmonizing radar absorption, infrared stealth, and mechanical flexibility is a difficult challenge. In this work, a flexible metamaterial absorber (SMMA) with a skin‐like multi‐scale structure capable of achieving radar‐IR compatible stealth was fabricated by utilizing freeze‐drying and screen‐printing techniques. The geometric parameters of the resonant metasurface and the dielectric constant of the SiC@Polyurethane (SiC@Pu) aerogel were optimized through electromagnetic simulations. By integrating metamaterial and SiC@Pu aerogel, this architecture synergizes structural and material losses to significantly enhance electromagnetic wave absorption (MA) performance. The skin‐like multi‐scale design ensures that incident electromagnetic wave undergo effective attenuation and dissipation. The final SMMA achieves excellent broadband MA performance with an effective bandwidth of 9.27 GHz and a peak reflection loss of −44.3 dB, while significantly reducing the radar cross‐section. Meanwhile, the hierarchically porous aerogel exhibits excellent thermal insulation, maintaining a surface temperature nearly 48°C lower than a 100°C heat source, thereby effectively suppressing the infrared signature. This research demonstrates a design strategy for skin‐like, multi‐scale metamaterial absorbers, providing a pathway toward advanced, flexible, radar‐infrared compatible stealth materials.