In this work, we propose a broadband, polarization-insensitive and wide incident angle stable metamaterial absorber (MA) based on the resistive film. The absorber consists of a three-layer structure with each layer of dielectric substrate printed with different shapes of resistive film. The multilayer structure not only extends the absorption bandwidth but also maintains high absorption under large wave incident angles. Numerical simulation shows that the absorptivity of a normal incident wave is above 90% in the frequency range 2.34–18.95 GHz, corresponding to a relative absorption bandwidth of 156%. Moreover, the whole MA structure has a total thickness of 11.3 mm, corresponding to 0.09 λ0 at its lowest absorption frequency. Due to the high symmetry of the structure, the absorber has good polarization insensitivity. In addition, for both transverse electric and transverse magnetic incidence, the proposed absorber achieves an absorptivity of more than 80% at incident angles of up to 45° and thus has good stability for wide incident angles. The absorption principle of the absorber is analyzed by the surface current and power loss density distribution. Parameter analysis is also performed for bandwidth optimization. Due to its advantages of wideband absorption with high efficiency, the proposed absorber has the potential to be applied to the energy-harvesting and electromagnetic stealth fields.

中文翻译：

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基于具有宽入射角稳定性的多层电阻膜的超宽带、偏振不敏感超材料吸收体

在这项工作中，我们提出了一种基于电阻膜的宽带、偏振不敏感和宽入射角稳定的超材料吸收体（MA）。吸收体由三层结构组成，每层介质基板上印有不同形状的电阻膜。多层结构不仅扩展了吸收带宽，而且在大波入射角下保持高吸收。数值模拟表明，在2.34-18.95 GHz频率范围内，法向入射波的吸收率在90%以上，对应的相对吸收带宽为156%。此外，整个 MA 结构的总厚度为 11.3 mm，对应于 0.09 λ0在其最低吸收频率。由于结构的高度对称性，吸收体具有良好的偏振不敏感性。此外，对于横向电和横向磁入射，所提出的吸收器在高达 45° 的入射角下实现了超过 80% 的吸收率，因此对于宽入射角具有良好的稳定性。通过表面电流和功率损耗密度分布分析吸收体的吸收原理。还执行参数分析以优化带宽。由于其具有宽带吸收和高效的优点，所提出的吸收器具有应用于能量收集和电磁隐身领域的潜力。