The all-dielectric coding metamaterial is obtained by encoding the unit structures constructed of conventional absorbing material. The combined effects of absorption and scattering to electromagnetic waves provide noteworthy application in reducing the radar cross section (RCS). In this Letter, utilizing the ${{\rm TiO}_2}/{\rm CNTs}$ material, we designed two types of hollow dielectric elements and coded them in a checkerboard format after calculation and analysis. The experimental results manifest that the frequency range where the RCS reduction is less than $ - {10}\,\,{\rm dB}$ covers from 5.3 to 18 GHz. The design of the hollow structure and the selection of low-density material make the all-dielectric coding metamaterial a small surface density. Additionally, the design of coding the all-dielectric elements will have potential application in radar stealth.

中文翻译：

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TiO ₂ / CNTs轻质全介电编码超材料的微波散射吸收特性

全介电编码超材料是通过对由常规吸收材料构成的单元结构进行编码而获得的。吸收和散射对电磁波的综合影响为减小雷达截面（RCS）提供了值得注意的应用。在这封信中，我们使用$ {{\ rm TiO} _2} / {\ rm CNTs} $材料设计了两种类型的中空介电元件，并在进行了计算和分析后以棋盘格格式对其进行了编码。实验结果表明，RCS降低小于$-{10} \，\，{\ rm dB} $的频率范围覆盖5.3至18 GHz。中空结构的设计和低密度材料的选择使全介电编码超材料的表面密度小。另外，对全电介质元件进行编码的设计将在雷达隐身方面具有潜在的应用。