An optically transparent metamaterial structure with simultaneously broadband microwave absorptivity and low infrared (IR) emissivity is proposed. Two specifically designed optically transparent metasurfaces were combined to realize radar and IR bi-stealth. One was designed to control the microwave absorption though properly modifying the impedance and resonance peaks of the meta-atom. The other was designed to control the IR radiation. Within a wide incident angle of ±60°, the proposed structure displays high absorptivity greater than 90% in the region of 6.28–12.29 GHz for TE polarization. For TM polarization, the absorptivity in the region of 7.19–15.26 GHz is greater than 90%. The IR emissivity of the metamaterial structure is about 0.30 in the IR region from 3 µ m to 14 µ m. The perfect consistency between experimental results and simulation results demonstrates that the proposal has practical application of multispectral stealth technology.

中文翻译：

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高效微波吸收和低红外发射的光学透明超材料

提出了同时具有宽带微波吸收率和低红外（IR）发射率的光学透明超材料结构。结合了两个专门设计的光学透明超表面，以实现雷达和红外双隐身。设计一种通过适当修改亚原子的阻抗和共振峰来控制微波吸收。另一个旨在控制IR辐射。在±60°的宽入射角范围内，所提出的结构在6.28–12.29 GHz的区域中显示出高的吸收率，TE极化的吸收率大于90％。对于TM极化，在7.19–15.26 GHz范围内的吸收率大于90％。在3μm至14μm的IR区域中，超材料结构的IR发射率约为0.30。