High Permittivity and Low-Loss Millimeter-wave Dielectric Ceramics

Millimeter (mm)-wave technology has great potential in applications of material, chemical, communication and life sciences. The development of high permittivity and low loss mm-wave devices has been promoted in recent years to boost the technologies. Here, the 0.95MgTiO₃-0.05CaTiO₃ and TiO₂ ceramic systems have been investigated. The influence of sintering process, microstructure has been discussed to optimize the THz performance. The 0.95MgTiO₃-0.05CaTiO₃ ceramics can possess permittivity of 18 and ultra-low loss of 1.9 × 10^-3; the TiO₂ ceramics show high permittivity of 102 and ultra-low loss of 4.2×10^-3.