In this work, a single-band metamaterial absorber (MA) based on a three dimensional (3D) resonant structure is presented. The unit cell is composed of a standing gear-shaped resonator, which is embedded in the dielectric substrate. The proposed 3D MA is ultrathin with a total thickness of 2.3 mm, corresponding 0.077λ₀ at its center frequency. The simulation results demonstrate a high absorption peak at 10.1 GHz with absorptivity of 99.9%. The proposed 3D MA is insensitive to the polarization of the incident wave due to its rotationally symmetric structure. Moreover, the proposed 3D MA exhibits a wide-incident-angle stability, as absorptivity of more than 85% can be achieved for both TE and TM incidences with incident angle up to 60°. Most importantly, multiband electromagnetic wave absorption of the stereo MA can be enabled by adjusting the structural parameters of the standing gear. The proposed structure is compatible with 3D printing technology and has potential applications in electromagnetic shielding.

在这项工作中，提出了基于三维（3D）共振结构的单波段超材料吸收器（MA）。单位单元由直立的齿轮形谐振器组成，该谐振器嵌入电介质基板中。所提出的3D MA与2.3mm的总厚度的超薄，对应0.077λ ₀在其中心频率。仿真结果表明在10.1 GHz处有一个高吸收峰，吸收率为99.9％。所提出的3D MA由于其旋转对称结构而对入射波的偏振不敏感。此外，提出的3D MA具有宽入射角稳定性，因为对于入射角高达60°的TE和TM入射都可以实现超过85％的吸收率。最重要的是，立体声MA的多频带电磁波吸收可以通过调整站立齿轮的结构参数来实现。所提出的结构与3D打印技术兼容，并且在电磁屏蔽方面具有潜在的应用。