Electrically tunable transmissive dielectric metamaterial based on SrTiO₃ Mie resonators

Metamaterials have become an important strategy for enhancing electromagnetic wave transmission, and the realization of transmission tunability has attracted considerable attention in current scientific research. In this study, we propose a transmissive metamaterial consisting of periodically arranged SrTiO₃ ceramic particles array and metallic grid array. Taking advantage of the Mie resonance of the dielectric particle array, the dispersion characteristics at the interface are precisely tailored, resulting in high transmission in the microwave frequency range. Furthermore, the temperature-sensitive permittivity of SrTiO₃ enables dynamic tuning of the transparency window toward higher frequencies through electrically induced thermal modulation. Both the selective high-transmissive performance and electrical tunability are validated through numerical simulations and experimental measurements. This work provides a convenient route to design tunable metamaterials, offering fascinating possibilities for the development of active microwave windows.