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Abstract
In this paper, we presented and investigated a special metamaterial absorber to achieve broadband absorption. Firstly, we proposed a two-dimensional (2D) structure, which include a hybrid layer on the top, a dielectric layer in the middle, and a metal ground on the bottom. By the hybrid design on the top layer of the absorber, we achieved broadband absorption. The relative bandwidth is 22.57%. Furthermore, in order to improve the absorption bandwidth, we changed the absorber as a three-dimensional (3D) structure. The simulated results show that the absorber can be obtained a broadband absorption, the relative bandwidth up to 82.93%. Compared to the two-dimensional structure, it is clear that the three-dimensional structure has a better absorption. According to the effective medium theory, the relative impedance is calculated to explain the absorption mechanism. Finally, we believe it will have many potential applications in sensing, energy harvest and so on.