New dielectric material system of La(Mg1/2Ti1/2)O3–Ca0.6La0.8/3TiO3 for microwave applications

The microstructure and microwave dielectric properties of xLa(Mg1/2Ti1/2)O3–(1 − x)Ca0.6La0.8/3TiO3 ceramics system with ZnO additions (0.5 wt.%) investigated by the conventional solid-state route have been studied. Doping with ZnO (0.5 wt.%) can effectively promote the densification and the dielectric properties of xLa(Mg1/2Ti1/2)O3–(1 − x)Ca0.6La0.8/3TiO3 ceramics. 0.6La(Mg1/2Ti1/2)O3–0.4Ca0.6La0.8/3TiO3 ceramics with 0.5 wt.% ZnO addition possess a dielectric constant (ɛr) of 43.6, a Q × f value of 48,000 (at 8 GHz) and a temperature coefficient of resonant frequency (τf) of −1 ppm/°C sintering at 1475 °C. As the content of La(Mg1/2Ti1/2)O3 increases, the highest Q × f value of 62,900 (GHz) for x = 0.8 is achieved at the sintering temperature 1475 °C. A parallel-coupled line band-pass filter is designed and simulated using the proposed dielectric to study its performance.