Four-arm Archimedes Spiral Metamaterial Absorber with Different Metal Wire Width Combinations

An Archimedes spiral metamaterial absorber structure is proposed in this paper. The unit structure of the proposed absorber is divided into three layers: the upper layer consists of four-armed Archimedes spirals of different widths, the middle layer is a dielectric board, and the bottom layer is a ground layer. Full-wave simulation showed that the proposed absorber can work at 22.5GHz–24.5GHz, and the absorption rate exceeds 50%. Especially from 23GHz to 24GHz, the absorption rate can reach 90%. In addition, in the operating frequency band, the proposed absorber has polarization insensitivity and wide-angle absorption characteristics in the range of −45° to +45°.