Chaotic pattern-based absorber designs in microwave bands for aerospace applications

This study investigates innovative microwave absorber designs based on chaotic systems and fractal geometries for advanced electromagnetic stealth applications. Initially, the dynamic characteristics of the Halvorsen system are analyzed, and the microwave absorption potential of fractal patterns derived from the Julia set is evaluated. This structure, optimized with copper resonators on a dielectric substrate, demonstrates orientation-insensitive absorption performance across the 1–25 GHz frequency range. In the second design, fractal geometries derived from the Three-Scroll Unified system are utilized to propose a miniature absorber structure that operates in the 6.28–20 GHz range and exhibits multiple resonance responses. The design is distinguished by its angular stability and polarization insensitivity. Lastly, inspired by the Thomas system, a compact and multiband absorber is presented, exhibiting strong absorption behavior within the 2.2–20 GHz frequency band. All designs are validated through analyses of electric field and surface current distributions at resonance frequencies, demonstrating their suitability for both scientific and military applications. The findings indicate that fractal surfaces derived from the characteristic phase-space topologies of chaotic attractors, when integrated with functional polymers, can form highly promising structures for radar cross-section (RCS) reduction, RF passive shielding, and electromagnetic signature suppression in high-frequency systems.