Graphene‐Driven Metadevice for Active Microwave Camouflage with High‐Efficiency Transmission Window,Small Methods

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Graphene‐Driven Metadevice for Active Microwave Camouflage with High‐Efficiency Transmission Window
Small Methods ( IF 10.7 ) Pub Date : 2020-12-13 , DOI: 10.1002/smtd.202000918
Cheng Huang _{1,

2} , Jianing Yang _{1,

3} , Chen Ji ₁ , Liming Yuan ₁ , Xiangang Luo _{1,

2}

Affiliation

The general method to achieve electromagnetic (EM) invisibility is to use absorbing materials that can reduce the backscattering microwave signals. However, they will influence the transmission of useful signals, and their passive operation mode also blocks the realization of active camouflage systems. Here, the authors propose an electrically tunable metadevice which can dynamically manipulate the reflection magnitude and realize high‐efficiency transmission at two distinctive frequency bands. Such a metadevice is driven by graphene sandwich structure integrated with multi‐layer metasurface. By electrically controlling the sheet resistance of graphene, the authors have experimentally verified that the metadevice can tune the reflection magnitude from −5 to −20 dB over a wide frequency band of 5–15 GHz, and meanwhile realize a high transparent EM window with 3‐dB transmission band covering from 23 to 25 GHz. The operation mechanism is discussed by examining the electric field distribution and also employing an equivalent circuit model to analyze the input impedance. Furthermore, using the developed metadevice, the authors still demonstrate its dynamical camouflaging performance and application potential as an antenna radome by experiment. The finding in this study is expected to trigger great interest in adaptive camouflage, stealth radome, and multifunctional EM manipulation fields.

中文翻译：

用于具有高效传输窗口的主动微波伪装的石墨烯驱动元装置

实现电磁 (EM) 隐身的一般方法是使用可以减少反向散射微波信号的吸收材料。但是，它们会影响有用信号的传输，而且它们的被动操作方式也阻碍了主动伪装系统的实现。在这里，作者提出了一种电可调元设备，它可以动态地控制反射幅度并在两个不同的频段实现高效传输。这种超器件由与多层超表面集成的石墨烯三明治结构驱动。通过电气控制石墨烯的薄层电阻，作者通过实验验证了元器件可以在 5-15 GHz 的宽频带内将反射幅度从 -5 调整到 -20 dB，同时实现了一个高透明的 EM 窗口，其 3-dB 传输频带覆盖了 23 到 25 GHz。通过检查电场分布并采用等效电路模型分析输入阻抗来讨论其运行机制。此外，作者还使用开发的元设备，通过实验证明了其动态伪装性能和作为天线罩的应用潜力。这项研究的发现有望引发对自适应伪装、隐形雷达罩和多功能电磁操纵领域的极大兴趣。作者仍然通过实验证明了其动态伪装性能和作为天线罩的应用潜力。这项研究的发现有望引发对自适应伪装、隐形雷达罩和多功能电磁操纵领域的极大兴趣。作者仍然通过实验证明了其动态伪装性能和作为天线罩的应用潜力。这项研究的发现有望引发对自适应伪装、隐形雷达罩和多功能电磁操纵领域的极大兴趣。

更新日期：2021-02-12

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