Ultra-thin Broadband Metamaterial Absorber with a Simple Cylindrical Structure

Develop a broadband, ultra-thin metamaterial absorber based on a carbonyl iron cylinder array to overcome the performance limitations of traditional magnetic absorbers in complex electromagnetic environments. The proposed metamaterial achieves a high absorption rate of 90% across a wide frequency range, spanning from 3.44 GHz to 18 GHz, and effectively covers the C, X, Ku, and 28% of the S bands, with a remarkably thin profile of just 2.4 mm. The impact of adjustments in structural parameters on the material’s absorption intensity is comprehensively analyzed. Additionally, the absorber demonstrates polarization insensitivity and sustains high absorption under oblique incidence, maintaining a rate above 90% at 10.02 GHz with an incident angle up to 50 degrees. Detailed investigations into the electric field, magnetic field, and power loss across frequencies provide insight into the absorption mechanisms. These results highlight an innovative approach to designing high-performance electromagnetic absorbing metamaterials with significant potential for practical applications in complex environments.