Combination of Expanded Graphite/Fe/Fe3O4 Composites and Hollowed Out Chiral Metamaterials toward Ultrathin, Ultralight, Broadband, Polarization‐Insensitive, and Wide‐Angle Absorbers,Advanced Materials Interfaces

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Combination of Expanded Graphite/Fe/Fe3O4 Composites and Hollowed Out Chiral Metamaterials toward Ultrathin, Ultralight, Broadband, Polarization‐Insensitive, and Wide‐Angle Absorbers
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-05-17 , DOI: 10.1002/admi.202000219
Zidong He ₁ , Yao Lu ₁ , Liwen Wu ₁ , Fanqi Wang ₁ , Wen Shao ₁ , Shihong Fu ₁ , Guoxiu Tong ₁

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Achieving thin, light, broad, and strong absorption properties for traditional electromagnetic wave absorbers remains a big challenge. In the present study, an ultrathin, single‐layer hybrid absorber consisting of a periodic array of hollowed out chiral mosquito‐incense unit cells filled by expanded graphite(EG)/Fe/Fe₃O₄ composites is proposed to drastically improve the integrated properties of traditional absorbers. The experiment verifies that absorption of the hybrid absorber remains higher than 90% at the frequency range of 21.4–36.3 GHz, which corresponds to the ultrathin thickness (0.5 mm), ultralight weight (0.83 kg m⁻²), and wide‐angle absorption (15°–60°). The equivalent LC circuit and current distribution are given to reveal that the superior properties stem from the synergistic effect of λ/4 resonances, multiple LC‐resonances, cross‐polarization, and cross‐coupling of the patterned structure. This finding demonstrates the potential for hybrid absorbers of ultra‐lightweight, ultrathin, broadband, polarization insensitive, and wide‐angle absorption to be used in millimeter wave devices.

中文翻译：

膨胀石墨/ Fe / Fe3O4复合材料和中空手性超材料的组合，适用于超薄，超轻，宽带，偏振不敏感和广角吸收剂

对于传统的电磁波吸收器，要实现薄，轻，宽，强的吸收性能仍然是一个巨大的挑战。在本研究中，提出了一种超薄的单层混合吸收器，该吸收器由周期性阵列的空心手性蚊香单元电池组成，这些单元电池中填充有膨胀石墨（EG）/ Fe / Fe ₃ O ₄复合材料，可显着提高集成性能传统吸收器。实验验证了混合吸收器在21.4–36.3 GHz频率范围内的吸收率仍高于90％，这对应于超薄厚度（0.5 mm），超轻重量（0.83 kg m ^-2）和广角吸收（15°–60°）。给出了等效的LC电路和电流分布，以显示出优越的性能来自λ/ 4共振，多重LC共振，交叉极化和图案结构的交叉耦合的协同效应。这一发现证明了毫米波设备中使用超轻，超薄，宽带，偏振不敏感和广角吸收的混合吸收器的潜力。

更新日期：2020-05-17

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