Low firing temperature 0.2Ca(0.8)Sr(0.2)TiO(3)-0.8Li(0.5)Sm(0.5)TiO(3) (CST-LST) ceramics by BaCu (B2O5) addition and TiO2 dopant were prepared via the conventional solid-state ceramic route, and the sintering, phase evolution, microstructure, and dielectric properties were investigated. Addition of BaCu (B2O5) lowered the firing temperature about 300 degrees C. The CST-LST ceramics with 5 wt% BaCu(B2O5) sintered at 950 degrees C exhibited single phase perovslcite structure, together with the optimum microwave dielectric properties of epsilon(r) = 66.7, Q x f = 3222 GHz, tau(f) = -21.3 ppm/degrees C. Adding TiO2 improved the microwave properties. Typically, the CST-LST + 5 wt% BaCu(B2O5) + 1.5 wt% TiO2 sintered at 950 C showed epsilon(r) = 71.6, Q x f = 3441 GHz, tau(f) = 10.8 ppm/degrees C. The high permittivity and low temperatures of the ceramics were ideal for the development of low cost ultra-small dielectric loaded antenna. Compatibility with Ag electrode indicated that this material was suitable for low temperature co-fired ceramics. (C) 2014 Elsevier Ltd. All rights reserved.