Abstract
Abstract
Lightweight and broadband microwave absorbing materials are essential for advanced stealth applications. In this study, RPUF composites incorporating multi-component microwave-absorbing fillers were prepared. A functionally graded structure was designed by integrating GFRP as the panel and CFRP as the backing layer. The optimized composite demonstrated excellent mechanical properties and effective absorption performance, achieving a reflection loss below −10 dB across the 8–18 GHz band. Experimental results closely aligned with simulation predictions, confirming the effectiveness of the structural design. This work offers a viable strategy for developing high-performance, lightweight absorbing materials suitable for such applications.