Abstract
This paper presents a polarization‐insensitive and ultra‐broadband metamaterial absorber (UMMA), which has higher absorption throughout the whole X‐band. The UMMA unit cell consists of a metal film and a multilayer‐cross‐cone structure separated by a dielectric layer. The calculation result shows that the UMMA's absorptivity is greater than 96% in the entire X‐band (8–12 GHz) and the UMMA is polarization‐insensitive for normal incident wave. Moreover, the absorption rate is also more than 80% in X‐band when the incident angle is less than 56° for TE polarization wave. The electric field, magnetic field, and surface current distribution of the UMMA are analyzed to study its absorption mechanism. The influences of different key structural parameters on the absorber are also discussed, including the arm length and arm width of the bottom and top of the cross‐cone structure and the number of layers of the cross metal, consequently, a set of optimized design parameters is obtained. The proposed UMMA has a higher absorption rate in the entire X‐band, the UMMA can be used in electromagnetic stealth, electromagnetic shielding, secret detection and so on.
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