In this paper, a chiral metamaterial absorber based on an Archimedes spiral structure is designed whose operating band can be extended by adjusting array elements and array layout factors. Thanks to its circular dichroism, it is highly selective for left-handed and right-handed circular polarized (LCP and RCP) incident waves at 19.172 GHz, absorbing 95% for LCP, while RCP is basically not absorbed. Meanwhile, a 2 2 unit structure is constructed, achieving efficient absorption ranging from 17.55 to 18.13 GHz by overlapping the resonant frequency bands of four different structures, whose relative bandwidth is six times the original single frequency. Then, because of the particularity of the helix, the structure has the characteristics of large-angle incident stability and 360 insensitivity in polarization. Ultimately, we analyze the absorption mechanism arising from the current and electric field distribution of the topological arrangement. In the model improvement, the size can be shrunk proportionally to realize the absorption of 1.337 THz waves. This design can be used in military stealth, photon detection, energy collection, and other scenarios.

本文设计了一种基于阿基米德螺旋结构的手性超材料吸收体，其工作频带可以通过调整阵元和阵列布局因素来扩展。由于其圆二色性，它对19.172 GHz的左旋和右旋圆偏振（LCP和RCP）入射波具有高度选择性，对LCP吸收95%，而RCP基本不被吸收。同时，构建了一个2 2 单元结构，通过重叠四种不同结构的谐振频带，实现了17.55至18.13 GHz范围内的有效吸收，其相对带宽是原始单频的六倍。然后，由于螺旋线的特殊性，该结构具有大角度入射稳定和偏振360度不敏感的特点。最终，我们分析了拓扑排列的电流和电场分布引起的吸收机制。在模型改进中，可以按比例缩小尺寸，实现对 1.337 THz 波的吸收。这种设计可用于军事隐身、光子探测、能量收集等场景。