A Three-Dimensional Broadband Absorbing Structure Based on Metamaterial

In this paper, a three-dimensional broadband strongly absorbing absorber is proposed, which achieves broadband matching performance by combining the three-dimensional impedance tapering resistive films and a two-dimensional circular resistive film. After simulation design and optimization, the reflection coefficient is better than −20 dB in the range of 2–18 GHz, and in particular, there are strong absorption peaks at 2.3 GHz and 8.0 GHz, with the absorption peak at 8 GHz reaching −55 dB. When the electromagnetic incident changes from 0° to 50°, the absorption is more than 90% in the range of 1.8-18 GHz, with a good polarization uniformity.