Herein, a polarization-insensitive and wide-angle characteristic ultrabroadband metamaterial absorber (UBMMA) is reported, which covers the entire X band and Ku band and parts of the C band and K band. The standard unit cell of the UBMMA is designed based on the frustum of a cone with a through-hole, and it is composed of multiple metal and dielectric layers by cross. The calculation results indicate that the absorptivity of the proposed UBMMA is more than 85% from 6.65 to 23.73 GHz except for the frequency bands 13.10–13.20 and 15.38–15.73 GHz, and the absorptivity is more than 90% in the frequency bands 6.65–12.25 and 20.33–23.33 GHz. The distributions of the electric field, magnetic field, and surface current are calculated and analyzed, and the absorbing mechanism of the UBMMA is explained. The UBMMA is insensitive to the transverse electric and transverse magnetic polarization, and it displays an agreeable absorption effect under high incident angles. The influence of important geometric parameters on the absorption performance of the UBMMA is studied. Because of the satisfactory ultrabroadband absorption performance of the UBMMA, it can be applied in the fields of satellite radar, broadband antennae, and electromagnetic shielding.

中文翻译：

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偏振不敏感广角超宽带超材料吸收体的设计与分析

本文报道了一种偏振不敏感和广角特性的超宽带超材料吸收体（UBMMA），其覆盖了整个 X 波段和 Ku 波段以及部分 C 波段和 K 波段。UBMMA的标准晶胞是基于带有通孔的圆锥台设计的，它由多个金属和介电层交叉组成。计算结果表明，除了 13.10-13.20 和 15.38-15.73 GHz 频段外，所提出的 UBMMA 在 6.65-23.73 GHz 的吸收率超过 85%，在 6.25-122 频段的吸收率超过 90%和 20.33–23.33 GHz。计算和分析了电场、磁场和表面电流的分布，并解释了 UBMMA 的吸收机制。UBMMA 对横向电极化和横向磁极化不敏感，并且在高入射角下显示出令人满意的吸收效果。研究了重要几何参数对UBMMA吸收性能的影响。由于UBMMA具有令人满意的超宽带吸收性能，可应用于卫星雷达、宽带天线、电磁屏蔽等领域。