The microwave dielectric properties of the xCa(Mg1/3Nb2/3)O-3-(1 - x)Ca0.61Nd0.26TiO3 ceramic system (x = 0.2, 0.4, 0.6, and 0.8) were investigated. The crystal structures and the microstructures of the ceramics were characterized using X-ray diffraction and scanning electron microscopy analyses, respectively. A near-zero temperature coefficient of resonant frequency was achieved by adjusting the x value of the system. When the x value was increased from 0.2 to 0.8, the dielectric constant epsilon(r) decreased from 83 to 34, the quality factor value (Q x f) increased from 13,000 to 45,000 GHz, and the temperature coefficient of resonant frequency (tau(r)) decreased from 85 to -21 ppm/degrees C. The 0.6Ca(Mg1/3Nb2/3)O-3-0.4Ca(0.61)Nd(0.26)TiO(3) ceramic system is suitable for microwave dielectric resonator applications, as it has an epsilon(r) value of similar to 47, a Q x f value of similar to 37,000 GHz, and a tau(r) value of similar to 5 ppm/degrees C. (C) 2014 Elsevier Ltd. All rights reserved.