摘要：The bismuth oxide thin films were prepared by thermal oxidation (in air) of vacuum evaporatedbismuth thin film on glass and alumina. Surface morphology shows granular structure on glassand triangular shaped grains on alumina substrates. The effect of bismuth oxide thin film overlayof different thickness on Ag thick film microstrip rectangular patch antenna was investigated inthe X- band (8-12GHz). The change in the resonance frequency, amplitude, band width, qualityfactor and input impedance of the antenna were studied. Using the resonance frequency thepermittivity and conductivity of bismuth oxide thin film was also measured. Thickness andoxidation temperature of Bi2O3 thin film overlay dependent changes in the patch antennacharacteristics was obtained. The input impedance increases due to the overlay. The dielectricconstant of bismuth oxide thin film on both substrate calculated from shift in resonancefrequency shows thickness and oxidation temperature dependent values. The microwavepermittivity and conductivity of Bi2O3 thin film on glass as well as alumina substrate have beenreported for the first time using overlay on thick film patch antenna. Thickness of overlaydependent tuning of the antenna has been achieved
