레이저 유도 그래핀 기반 픽셀화 주파수 선택적 표면 레이더 흡수체

초록

Fiber-reinforced polymer (FRP) composites, particularly glass-fiber/epoxy, have been recognized in aerospace industry for their high specific strength, stiffness-to-weight ratio, and design flexibility. When combined with carbon-based fillers and multilayer or frequency-selective surface (FSS) designs, effective radar absorbing structures (RAS) can also be realized 1,2 . Recently, laser-induced graphene (LIG) has emerged as a promising material for stealth applications due to its rapid, mask-free fabrication on polymers like polyimide (PI), tunable conductivity, and porous structure 3,4 . Despite several studies demonstrating the potential of LIG-based absorbers, studies integrating LIG FSS with FRP composites remain limited. To address this, we propose a design approach using enetic algorithm (GA) 5 coupled with LIG rapid fabrication to design pixelated RAS. The resulting glass-fiber/epoxy composite RAS, incorporating a pixelated LIG FSS and protective face-sheet, demonstrates microwave absorption across the X-band (8.2~12.4 GHz) with return loss below ?10 dB, achieving over 90% absorption in a thin structure.