Design and Preparation of Au‐Al2O3 Metamaterials Compatible with Infrared Radiation Suppression and Microwave Transparency

Infrared radiation suppression and microwave transparency compatible metamaterials play a crucial role in controlling the temperature of communication equipment and ensuring effective signal transmission. In this article, the infrared spectral response of the Au‐Al 2 O 3 metamaterial structure is simulated using the finite difference time domain method. The influence of the edge electric field distribution within the Au‐Al 2 O 3 metamaterial pattern on the infrared spectra characteristics is designed and analyzed. The infrared reflectivity and the peak value of the designed Au‐Al 2 O 3 metamaterial structure within the range of 3–14 μm exceed 83.80% and reach 91.70%. Meanwhile, the microwave transmittance remains above 90%. When heated to 300 °C, the radiative temperature is merely 70.5 °C, demonstrating excellent ability to reduce the radiation temperature and infrared radiation suppression effects. This is attributed to the forced vibration of free electrons induced by incident electromagnetic waves on the metal surface. This article provides a novel method for the design of infrared radiation suppression and high microwave transmittance compatible metamaterials.