Properties of magnesium oxide and magnesium oxide-bismuth oxide mixed thick film

Purpose - The purpose of this paper is to study properties of magnesium oxide and mixed magnesium oxide-bismuth oxide thick films for application in tuned devices. Design/methodology/approach - The effect of magnesium oxide and mixed magnesium oxide-bismuth oxide thick films overlay of different thickness on Ag thick film microstrip rectangular patch antenna was investigated in the X band (8-12 GHz). Using Ag thick film microstrip rectangular patch antenna the thick and mixed thick films was characterized by microwave properties such as resonance frequency, amplitude, bandwidth, quality factor and input impedance. Using the resonance frequency the permittivity of magnesium oxide and mixed magnesium oxide-bismuth oxide thick films was measured. Findings - Cubic structure of single magnesium oxide and monoclinic structure of bismuth oxide was present in mixed thick film. Also the morphology of single thick films was maintained in mixed thick film of magnesium oxide-bismuth oxide. Due to overlay magnesium oxide and magnesium oxide-bismuth oxide mixed thick films, change in resonance frequency shifts towards high frequency end was observed. Dielectric constant of magnesium oxide and mixed magnesium oxide-bismuth oxide thick film calculated from resonance frequency decreased with increase in thickness. Originality/value - The microwave properties using Ag thick film microstrip patch antenna due to overlay of magnesium oxide and mixed magnesium oxide-bismuth oxide thick films have been reported for the first time. Thickness of overlay dependent tuning of the antenna has been achieved.