An ultra-wideband metamaterial absorber (MA) consisting of three layers of resistive ink separated by two layers of polymethacrylimide is proposed. The results of full-wave simulation show that the absorptivity is high up to 95% with a bandwidth ratio of 1:9.73 over the wide frequency range from 4.20 to 40.87 GHz, covering the whole C, X, Ku, K, and Ka bands. Moreover, the MA is insensitive to polarization and exhibits wide-angle stability, which is investigated by the full-wave simulation results as well as the analysis of multi-reflection interference theory. The fabricated prototype with a single unit cell of 0.081 g is tested using free-space measurement in an anechoic chamber, and the measured results are in good agreement with the simulation results, which prove the robustness of the design and indicates a practical application prospect of the proposed ultra-wideband MA with lightweight, simple, and compact structure.

提出了一种由三层电阻油墨组成的超宽带超材料吸收体 (MA)，由两层聚甲基丙烯酰亚胺隔开。全波仿真结果表明，在4.20~40.87 GHz的宽频范围内，吸收率高达95%，带宽比为1:9.73，覆盖了整个C、X、Ku、K和Ka频段. 此外，MA对偏振不敏感并表现出广角稳定性，这通过全波模拟结果以及多反射干涉理论的分析进行了研究。在消声室中使用自由空间测量对具有 0.081 g 单晶胞的制造原型进行了测试，测量结果与模拟结果非常吻合，