The microwave dielectric properties and the microstructures of the (1-x)MgTiO3-xCaTiO3 ceramic system were investigated. With partial replacement of Mg by Co, dielectric properties of the (1-x)(Mg0.95Co0.05)TiO3-xCaTiO3 ceramics can be promoted. The microwave dielectric properties are strongly correlated with the sintering temperature. At 1275°C, the 0.95(Mg0.95Co0.05)TiO3-0.05CaTiO3 ceramics possesses excellent microwave dielectric properties: a dielectric constant r of 20.3, a Q×f value of 107000 (at 7GHz) and a τf value of -22.8ppm/°C. By appropriately adjusting the x value in the (1-x)(Mg0.95Co0.05)TiO3-xCaTiO3 ceramic system, zero τf value can be achieved. With x=0.07, a dielectric constant γ of 21.6, a Q×f value of 92000 (at 7GHz) and a τf value of -1.8ppm/°C was obtained for 0.93(Mg0.95Co0.05)TiO3-0.07CaTiO3 ceramics sintered at 1275°C for 4h.
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