The microwave dielectric properties and the microstructures of (1−x)CaTiO 3 –xNd(Mg 1/2 Ti 1/2 )O 3 ceramics prepared by the conventional solid-state route have been studied. Doping with 0.5wt% ZnO can effectively promote the densification and the microwave dielectric properties of (1−x)CaTiO 3 –xNd(Mg 1/2 Ti 1/2 )O 3 . The dielectric constant decreases from 145 to 30.5 as x varies from 0.1 to 1.0. In the (1−x)CaTiO 3 –xNd(Mg 1/2 Ti 1/2 )O 3 system, the microwave dielectric properties can be effectively controlled by varying the x value. The dielectric constant of 44, a Q×f value of 43,800GHz and a τ f value of 1.2ppm/°C were obtained for 0.1CaTiO 3 –0.9Nd(Mg 1/2 Ti 1/2 )O 3 ceramics sintered at 1325°C for 4h. A band-pass filter is designed and simulated using the proposed dielectric to study its performance.