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Microwave Behaviour of Bi2O3, TiO2 and γ-Fe2O3 Thick Film Overlays on Microstrip Rejection Filter

The paper reports the preliminary studies on the effect of thick film overlays of Bi2O3, TiO2 and γ-Fe2O3 materials on microstrip rejection filters. Variation of resonant frequency and quality factor of the rejection filter with overlay thickness are studied. It is observed that resonant rejection frequency and quality factor decrease smoothly with increase in the overlay thickness for Bi2O3 & TiO2 with logarithmic relation; but for γ-Fe2O3 after a particular thickness, resonant rejection abruptly disappears and its variation is slightly orientation dependent.