High-Performance Water-Based Metamaterial Wave Absorber Based on Ku Band

Traditional absorbing materials have certain limitations in coping with complex electromagnetic environments. As an area of significant concern in research, water-based metamaterial absorbers are expected to become one of the essential solutions to the current electromagnetic wave pollution problem. This paper uses rubber and a multi-layer water structure to design a metamaterial with high-performance absorption. The simulation results demonstrate that the proposed water-based metamaterials are able to achieve 90% absorption in the frequency band from 11.17 to 25.16 GHz. Specifically, the Ku band’s average absorption rate reaches as high as 99.34%. The absorption characteristics of the water-based metamaterials include polarization insensitivity and wide-angle incidence in both TE and TM modes. Moreover, broadband absorption is achieved even at a large incident angle of the TM mode. The electric and magnetic field distributions indicate that the exceptional absorption of the water-based metamaterial relies primarily on the magnetic resonance generated by the multi-layer water structure. The proposed metamaterial is utilized for multiple-band signal shielding, effectively addressing communication signal interference and electromagnetic leakage from electronic equipment, and safeguarding against electromagnetic interference in practical applications.