Dynamically tunable microwave perfect absorber with flexible and lightweight properties based on magnetorheological material

In this paper, a microwave perfect absorber based on magnetorheological material is proposed and investigated. The absorber achieves broad-band, flexible, and lightweight properties through the fusion of a metasurface. Firstly, full-wave numerical simulation is conducted, demonstrating that the proposed absorber achieves a peak absorption of 99.99 ​% at 13.95 ​GHz. Additionally, a broad bandwidth of 90 ​% absorption is observed from 10 ​GHz to 18 ​GHz in full-wave simulation, and the experimental results ranges from 11.7 ​GHz to 16.1 ​GHz. Importantly, the proposed absorber could be fabricated using an easy and low-cost method where laser engraving method is adopted. Experimental measurements in the microwave anechoic chamber confirm that the experimental results align well with the simulation. Furthermore, the absorption mechanism of the proposed absorber is investigated through a detailed analysis of the electric field and magnetic field. This study presents an effective approach for achieving lightweight and flexible electromagnetic protection materials in the microwave range, which could facilitate the practical application of absorbers in the field of military anti-reconnaissance.