Ceramic‐based meta‐material absorber with high‐temperature stability

Abstract With the continuous exploration of uncharted and extreme environments, enhanced temperature robustness of passive devices has become particularly important. In this study, a ceramic‐based meta‐material absorber with exceptional temperature stability is developed using a fusion design approach that combines rare metal‐based tungsten bronze structural ceramics and meta‐materials. Specifically, the absorbance of the meta‐material array based on Mie resonance exceeds 49.0% in both waveguides and free space, approaching the theoretical limit. According to impedance analysis, the absorption performance can be distinctly correlated with the dielectric loss ( Q f ). Notably, the high‐temperature robustness is verified to still be effective at 400 °C. These advancements in our design allow for the use of monolithic materials in fabricating temperature‐stable perfect absorbers, providing greater freedom in the dielectric performance and expanding their potential applications, including in space exploration and 5G millimeter‐wave scenarios.