Broadband Circuit Analog Radar Absorbing Structure based on Laser- Induced Graphene

초록

Stealth technology has become a critical requirement in modern fighter aircraft. Radar cross-section (RCS) reduction is achieved through both aerodynamic shaping and radar absorbing materials (RAM) or structures (RAS). Among various absorber designs, frequency-selective surface (FSS)-based circuit analog (CA) RAS have attracted significant attention. Recently, laser-induced graphene (LIG) has emerged as a promising candidate for microwave and stealth applications owing to its unique advantages: direct, mask-free fabrication on polymer substrates such as polyimide (PI), tunable sheet resistance via laser parameters, and a porous morphology that enhances surface interactions [1,2]. To optimize pixelated RAS patterns, evolutionary algorithms such as the genetic algorithm (GA) have been widely adopted due to their ability to efficiently search large combinatorial design spaces [3]. In this work, we introduce a neutral genotype?phenotype mapping strategy within a binary GA framework to accelerate convergence in the design of pixelated LIG-based CA radar absorbing structure. The proposed method combines the structural advantages of glass-fiber/epoxy composites with the functional benefits of patterned LIG. We have produced lightweight composite RAS capable of achieving over 90% absorption in the X-band (8.2?12.4 GHz).