3D printed PEEK/CF nanocomposites metamaterial for enhanced resonances toward microwave absorption and compatible camouflage

The stealth materials for future weapons and equipment need to operate within the radar working band, be lightweight, easy to process, and compatible with infrared stealth. Integrating all these characteristics poses a significant challenge. This work utilizes poly (ether-ether-ketone)/carbon fibers (PEEK/CF) composite materials and employed reverse-guided manufacturing through simulation design. Incorporating a grid structure within the pyramid metamaterial enables electromagnetic wave reflecting multiple times in various directions. By optimizing the important interaction between dielectric properties of the materials structures, the Pyramid Grid Filled Metamaterial enables broadband electromagnetic wave absorption (<-10 dB, 8-18 GHz), weak angular dependence (5- 45(o) incidence), polarization insensitivity, radar cross section (RCS) reduction (reduction over 10 dB between theta = -60 degrees and 60 degrees), and infrared camouflage performance. The PGF metamaterial of 180 lozenge 180 mm(2), weighs only 103.1 g at a thickness of 9 mm. This work paves a way for the design the radar infrared compatible composite metamaterials.