The microwave dielectric properties and microstructures of the new (1−x)MgTiO 3 –xCa 0.6 La 0.8/3 TiO 3 ceramic system, prepared using a mixed oxide route, were investigated. Combination of MgTiO 3 (MT) and Ca 0.6 La 0.8/3 TiO 3 (CLT) forms a two-phase system and leads to a near-zero τ f . With increasing x, the microwave Q×f decreased and ε r increased. A microwave dielectric material having a ε r of 25.45, a Q×f of ~82,500 GHz (at 8.5 GHz), and a τ f of ~0.5 ppm/°C can be obtained from the compound 0.85MgTiO 3 –0.15Ca 0.6 La 0.8/3 TiO 3 sintered at 1275 °C for 4 h. It is proposed as a candidate material for ISM band components and GPS antennas.