The effects of substituting Nb5+ with Ta5+ on the microwave dielectric properties of the ZnNb2O6 ceramics were investigated in this study. The forming of Zn(Nb1-xTax)(2)O-6 (x=0-0.09) solid solution was confirmed by the measured lattice parameters and the EDX analysis. By increasing x, not only could the Q x f of the Zn(Nb1-xTax)(2)O-6 (x=0-0.09) solid solution be tremendously boosted from 83 600 GHz at x=0 to a maximum 152 000 GHz at x=0.05, the highest epsilon(r)similar to 24.6 could also be achieved simultaneously. It was mainly due to the uniform grain morphology and the highest relative density of the specimen. A fine combination of microwave dielectric properties (epsilon(r)similar to 24.6, Q x f similar to 152 000 GHz at 8.83 GHz, tau(f)similar to-71.1 ppm/degrees C) was achieved for Zn(Nb0.95Ta0.05)(2)O-6 solid solution sintered at 1175 degrees C for 2 h.