Abstract
This paper reports the study of structural, morphological and microwave dielectric properties of Co3O4 added corundum type Mg4Nb2O9 ceramics, sintered at 1200–1300 °C. The samples were prepared by solid state reaction method. X-ray diffraction patterns of these samples confirm the phase (Mg1−x Cox)4Nb2O9 along with a small percentage of secondary phase Mg4Nb2O9. The SEM micrographs suggest the gradual grain growth with the increase in Co addition as well as sintering temperature. The microwave dielectric properties of sintered ceramics were investigated by dielectric resonator method and they show a strong dependence on their composition, densification and microstructure. A good combination of dielectric properties with dielectric constant (er) of 16.69, quality factor (Qf) of 65,849 GHz (at 9.3 GHz) and nearly zero temperature coefficient of resonant frequency ( $${\tau }_{f}$$ ) have been obtained for (Mg0.7Co0.3)4Nb2O9 composition, sintered at 1275 °C. The design of a coupler circuit was simulated by Sonnet Lite software and then fabricated on this thermal stable ceramic taking centre frequency as 2 GHz. The experimental result resembles well with the simulated result and shows ~70% size reduction as compared to a similar circuit designed on FR4 substrate.
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