Dual-mode reinforced hybrid diamond lattice structure with excellent radar-absorption and mechanical performance

This study presents a multifunctional lattice structure that integrates ultrawideband microwave absorption with high specific compressive strength for potential aerospace and military applications. A dual-mode enhanced hybrid diamond lattice structure (HDLS) was developed through interlocking technology, synergistically combining RAPMI foam cellular filling with hierarchical phase ribs. Analytical models for both electromagnetic and mechanical responses were established, and multi-objective particle swarm optimization was employed to identify the optimal configuration. The optimized HDLS, with a total thickness of 24 mm, delivers effective absorption bandwidths of 5.4–8.4 GHz and 9.6–40 GHz, covering the C, X, Ku, K, and Ka bands. Its compressive specific strength reaches 70.1 × 10 ³  m ² /s ² , with model predictions agreeing with experimental results within 10 %. The HDLS thus offers a synergistic balance of ultrawideband absorption and high specific strength, outperforming existing radar-absorbing structures in overall performance. This design shows promise for surface components on aircraft and warship platforms, although further validation under complex loading and environmental conditions remains necessary.