Millimeter-Wave Free-Space Measurement of Dielectric Properties on High-Temperature Materials

Millimeter-wave (mm-wave) frequency bands are gaining increasing attention for their potential in aerospace, defense, and communication systems. Critical radio frequency (RF) components in these applications must function reliably under extreme environmental conditions such as high temperatures. Despite their importance, the dielectric properties specifically, dielectric permittivity and polarizability-of many candidate materials at mm-wave frequencies remain insufficiently characterized, particularly under such harsh conditions. This study investigates the temperature-dependent dielectric behavior of more than 10 materials, including crystals, ceramics, and glasses. The results provide key insights into material performance at elevated temperatures and contribute to the advancement of high-performance RF components designed for operation in extreme environments.