Abstract
The microstructure and microwave dielectric properties of xLa(Mg 1/2Ti 1/2)O 3–(1 − x)Ca 0.6La 0.8/3TiO 3 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(Mg 1/2Ti 1/2)O 3–(1 − x)Ca 0.6La 0.8/3TiO 3 ceramics. 0.6La(Mg 1/2Ti 1/2)O 3–0.4Ca 0.6La 0.8/3TiO 3 ceramics with 0.5 wt.% ZnO addition possess a dielectric constant ( ɛ r ) of 43.6, a Q × f value of 48,000 (at 8 GHz) and a temperature coefficient of resonant frequency ( τ f ) of −1 ppm/°C sintering at 1475 °C. As the content of La(Mg 1/2Ti 1/2)O 3 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.
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