Abstract
In this paper, the MgF2-doped (1 − x)MgTiO3-x(Ca0.8Sr0.2)TiO3 (x = 0.01–0.09) ceramics with high-quality factor (Q × f) and near-zero temperature coefficient of the resonant frequency (τf) were synthesized by solid-state reaction method. The effects of MgF2 addition on the phase composition, sintering behavior, and microwave dielectric properties in this system were completely investigated. Furthermore, the sintering temperature of 3 wt% MgF2-doped 0.95MgTiO3-0.05(Ca0.8Sr0.2)TiO3 ceramics can be lowered to 1225 °C. Then, the best microwave dielectric properties of εr ∼ 19.99, Q × f ∼ 90,100 GHz (at 8.72 GHz) and τf ∼ −2.9 ppm/°C were obtained. It provides a solid foundation for widespread applications of microwave dielectric substrates, filters, resonators, and patch antennas in modern wireless communication equipment.
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