The compatible stealth functionality in the infrared (IR) and radar wave bands is the most important research topic in the field of stealth material technology. Here, a new hybrid metasurface (HMS) for infrared-multiband radar stealth-compatible materials was proposed and studied. Two specifically designed metasurface layers that can control the infrared emission and microwave absorption were combined to realize radar and IR bi-stealth. The simulated and experimental results show that the HMS has five strong absorption peaks at f 1 = 6.35, f 2 = 8.38, f 3 = 12.10, f 4 = 15.37 and f 5 = 18.05 GHz. In addition, the emissivity of the proposed HMS is less than 0.32 from 3 to 14 µm and shows low emissivity characteristics in the infrared band. These results demonstrate that the proposal has practical application to multispectral stealth technology. INDEX TERMS Metasurfaces, infrared-radar stealth-compatible, low emission.
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 µm to 14 µm. The perfect consistency between experimental results and simulation results demonstrates that the proposal has practical application of multispectral stealth technology.
A visible-light-transparent metasurface has been designed to achieve infrared (IR)–radar stealth. An optically transparent material, indium tin oxide was chosen in preference to other low-IR-emissivity metals to achieve camouflage compatibility for the IR–radar stealth material. In addition, flexible polyethylene terephthalate was adopted as the dielectric material to in order to benefit from its visible light transparency; its softness could also improve its application prospects. The fabricated structure exhibited a strong absorptivity of over 90% from 8.265 GHz to 17.65 GHz and a low IR emissivity of less than 0.3 in the region of 3–14 μm. The results demonstrated that the metasurface was polarization independent and it was still able to maintain 90% of its absorptivity with an oblique incidence of 20°. The good consistency between the experimental and simulated results verified that the proposed metasurface can be practically applied in multifunctional stealth technology.
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