Multiscale Interface Engineering in Polyvinylidene Fluoride/Polyurethane Metafabric toward Compatible Modulation for Radar Stealth and Infrared Camouflage

An in-depth exploration and development of multifunctional stealth materials with multispectral compatibility holds significant importance in addressing the increasingly deteriorating electromagnetic environment and the rapid advancement of detection systems. This study proposes an alternative fabric design that achieves precise multiscale interface construction through the ingenious combination of polymer matrices in different forms coupled with the precise customization and arrangement of functional particles. Due to the synergistic effects between dielectric/magnetic loss mechanisms and infrared shielding characteristics, the fabricated metafabric exhibits ultrahigh electromagnetic wave absorption performance and superior infrared stealth capability. The radar wave effective absorption area covers over 95.6% of the X-band spectrum and delivers a minimum reflection loss of up to -56.6 dB (at 10.11 GHz). Additionally, it provides a highly effective camouflage against infrared radiation across diverse operational environments. Furthermore, finite element simulations were employed to model the radar cross section in the far field under electromagnetic fields, investigating the actual response to electromagnetic wave signals. This study achieves highly efficient broadband stealth functionality, establishing a multifrequency compatible stealth material model based on multiscale interface design. It facilitates a deep understanding of detailed dielectric and magnetic coupling mechanisms, thereby advancing the development of theoretical frameworks and methodologies for optimizing camouflage functionality design.