Multispectral camouflage, especially for the infrared-microwave range, is an essential technology for the safety of facilities, vehicles, and humans. So far, it has been realized mainly by high infrared specular reflection and high microwave absorption. However, external infrared sources can expose the target through specular reflection; also, the heat production from microwave absorption can increase the infrared radiation. This work proposes a multispectral camouflage scheme based on hierarchical visible-infrared-microwave scattering surfaces to address these issues. The proposed device exhibits: (1) low infrared emissivity (ε 8–14 μm = 0.17) and low infrared specular reflectivity (R s 8–14 μm = 0.13), maintaining low infrared radiation and capability to overcome the presence of an external infrared source simultaneously; (2) high scattering in microwave range, with −10 dB radar cross section reduction bandwidth of 8–13 GHz, simultaneously achieving microwave camouflage and reducing the heat production; (3) tunability of color for visible camouflage. This work proposes a method to control scattering over visible-infrared-microwave bands, thereby introducing a new design paradigm for modern camouflage technology.

中文翻译：

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用于多光谱伪装的分层可见-红外-微波散射表面

多光谱伪装，尤其是红外-微波范围的伪装，是保障设施、车辆和人员安全的一项重要技术。到目前为止，主要是通过高红外镜面反射和高微波吸收来实现的。但是，外部红外源可以通过镜面反射暴露目标；此外，微波吸收产生的热量可以增加红外辐射。这项工作提出了一种基于分层可见-红外-微波散射表面的多光谱伪装方案来解决这些问题。所提出的装置表现出：（1）低红外发射率（ε 8–14 微米= 0.17) 和低红外镜面反射率 (R s 8–14 微米= 0.13)，保持低红外辐射和同时克服外部红外源存在的能力；(2) 微波范围内的高散射，-10 dB 雷达截面降低带宽为 8-13 GHz，同时实现微波伪装和减少发热；(3) 可见伪装的颜色可调性。这项工作提出了一种控制可见红外微波波段散射的方法，从而为现代伪装技术引入了一种新的设计范式。