An optically transparent sandwich structure for radar-infrared bi-stealth.

• An optically transparent metasurface with high-efficiency microwave absorption and low IR emission simultaneously was investigated. • The proposed device is an ITO/dielectric/ITO sandwiched structure. It does not require a special low emissivity layer to reduce IR emission. • The effect of sheet resistance to microwave absorbing performance and IR emissivity is also discussed. • The IR response of the sample was analyzed qualitatively. An ultrathin optically transparent metasurface with simultaneous high-efficiency microwave absorptivity and low infrared (IR) emissivity is proposed. The proposed metasurface is an ITO/dielectric/ITO sandwiched structure. By properly tuning the structural parameters and sheet resistance of ITO, a wide microwave absorption band (5.8–8.3 GHz) greater than 90% is achieved. Furthermore, a low IR emissivity of 0.52 was obtained by adjusting the filling ratio of the ITO part. Thus, the proposed metasurface does not require a special low emissivity layer to reduce IR radiation. The perfect consistency between experimental and simulation results demonstrates that the proposal has practical application of multifunctional stealth technology. [ABSTRACT FROM AUTHOR]