In this paper, we present a novel broadband microwave absorber. Each unit in the metamaterial consists of a layer of dielectric material sandwiched between two layers of metal patches. Due to metal-dielectric-metal structures consist of symmetric resonators that have low co-polarization and cross-polarization as absorbers, the upper metal layer comprises a novel double-split ring resonator and a central octagonal ring pattern. Our simulation results show that the absorption of the proposed absorber is above 90% in the frequency range from 5.7 to 13.1 GHz. The absorption bandwidth over which the absorptivity exceeds 90% is approximately 7.4 GHz. The calculated relative bandwidth of 78.1% meets the standard for ultra-broadband absorption, and thus has prospects in applications. There are four main resonance frequencies at 6.07, 9.18, 12.75, and 13.11 GHz. And, the absorptivity is not significantly affected by the variation of the incident angle. We find that the resonance phenomenon becomes increasingly prominent as the incident wave frequency increases.

在本文中，我们提出了一种新颖的宽带微波吸收器。超材料中的每个单元都包含一层介电材料，该材料夹在两层金属贴片之间。由于金属-电介质-金属结构由具有低共极化和交叉极化的对称谐振器作为吸收体组成，因此上层金属层包括新颖的双分裂环形谐振器和中央八边形环形图案。我们的仿真结果表明，在5.7至13.1 GHz的频率范围内，所提出的吸收器的吸收率超过90％。吸收率超过90％的吸收带宽约为7.4 GHz。计算出的相对带宽为78.1％，符合超宽带吸收标准，具有广阔的应用前景。在6.07、9.18、12.75和13处有四个主要的共振频率。11 GHz。并且，吸收率不受入射角的变化的显着影响。我们发现，随着入射波频率的增加，共振现象变得越来越突出。