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Yuan Tian, Shuo Cheng, Guoyu Yang, Xuming Yao, Long Cheng, Yujun Li, and Jianjun Jiang, A broadband metamaterial wave absorber based on carbonyl iron powder modified dielectric layer, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-3044-z
Yuan Tian, Shuo Cheng, Guoyu Yang, Xuming Yao, Long Cheng, Yujun Li, and Jianjun Jiang, A broadband metamaterial wave absorber based on carbonyl iron powder modified dielectric layer, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-3044-z
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一种基于羰基铁粉改性介质层的宽带超材料吸波体

摘要: 在宽带超材料吸收材料领域,大部分研究工作集中在谐振层的优化和多层结构的设计上,而对介质层本身的研究相对较少。本文提出了一种采用羰基铁粉修饰介质层的方法,该方法显著提高了超材料吸收体介质层在X波段的电磁波衰减能力。设计了一种在4.92–18 GHz频率范围内,覆盖C、X、Ku波段,反射损耗(RL)小于–10 dB的宽带吸波器。通过对表面电流分布、功率损耗分布的分析,阐明了吸收剂的吸收机理。结果表明,改性后的介质层在2–18 GHz频段损耗占总损耗的30%以上,有效吸收带宽(RL ≤ –10 dB)几乎是未改性介质层的两倍,这主要归功于羰基铁粉引入了一种新的电磁波损耗机制。同时,该吸波器具有良好的角稳定性,在6.0–18.0 GHz范围内,即使入射角增加到60°,吸波率仍保持在80%以上(RL ≤ –7 dB)。 实验结果表明,测量结果与仿真结果吻合较好,与其他增宽吸收带宽的方法相比,该方法获得的超材料吸收器具有吸收宽带宽、轮廓薄、制造工艺简单等优点。这种方法为宽带吸收器的设计提供了一个新的、有前途的方向。

 

A broadband metamaterial wave absorber based on carbonyl iron powder modified dielectric layer

Abstract: In the field of broadband metamaterial absorbers, most research efforts have focused on optimizing the resonant layers and designing multi-layer structures, but relatively little attention has been paid to the dielectric layers themselves. This paper proposed a method using carbonyl iron powder to modify the dielectric layer. This method significantly enhances the electromagnetic wave attenuation capability of the dielectric layer with the X-band range for metamaterial absorbers. A broadband absorber with a reflection loss (RL) of less than –10 dB within the frequency range of 4.92–18 GHz and covering the C, X, and Ku band was designed. This work analyzed the surface current distribution and the power loss distribution to elucidate the absorption mechanism of the absorber. It was found that the modified dielectric layer accounted for more than 30% of the total loss in the 2–18 GHz frequency band, and the effective absorption bandwidth (RL ≤ –10 dB) was almost twice that of the unmodified dielectric layer. This enhancement in absorption bandwidth is attributed to the introduction of a new electromagnetic wave loss mechanism by carbonyl iron powder. Meanwhile, the absorber exhibited good angular stability, maintaining at least 80% absorption (RL ≤ –7 dB) in the 6.0–18.0 GHz range even when the incident angle was increased to 60°. The experimental results showed that the measured results matched the simulation results well. Furthermore, compared with other methods for broadening the absorption bandwidth, the metamaterial absorber obtained by this method offers several advantages, including wideband absorption, thin profile, and a simple manufacturing process. This approach provides a new and promising direction for the design of broadband absorbers.

 

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