We proposed and demonstrated a reconfigurable water-based metasurface to achieve continuously dynamic control of electromagnetic (EM) reflection within a wide frequency band. The proposed metasurface is an array of an anisotropic unit cell consisting of two metallic layers separated by a dielectric layer. The flowing channel of the distilled water is designed in the dielectric spacer, so the metasurface is reconfigured by simply changing the injection quantity of water. Calculated, simulated and real-time measured results show that the reflection almost monotonically reduces as the water is injected into the metasurface, and the tunable level of reflection is larger than 10 dB from 8 to 18 GHz during the reconfiguring process. Besides the absorption resulting from the injected water, the EM reflection variation is partly contributed to the scattering mechanism. The results here provide an effective solution to flexibly control EM reflection from an object, and may find potential...

中文翻译：

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使用可重构的水基超表面动态控制电磁反射

我们提出并演示了一种可重构的水基超颖表面，以实现在宽频带内对电磁（EM）反射的连续动态控制。提出的超颖表面是各向异性晶胞的阵列，由两个被介电层隔开的金属层组成。蒸馏水的流动通道设计在介电垫片中，因此只需更改水的注入量即可重新配置超颖表面。计算，模拟和实时测量结果表明，随着水注入超颖表面，反射几乎单调减少，并且在重新配置过程中，可调的反射级别在8至18 GHz范围内大于10 dB。除了注入水带来的吸收外，电磁反射的变化部分地有助于散射机制。此处的结果为灵活控制对象的EM反射提供了有效的解决方案，并可能发现潜在的...