Response of Ag thick film microstripline to perturbation of bulk lead free ferroelectric ceramics

The purpose of this paper is to describe the use of strontium - substituted barium niobate bulk ceramic superstrate on Ag thick film microstripline, to modify its response and measure complex permittivity as a function of strontium. Strontium barium niobates (Sr_xBa_1-xNb₂O₆) have been synthesized by solid state sintering technique. The perturbation obtained in the transmittance and reflectance of thick film microstripline due to the Sr_xBa_1-xNb₂O₆ (.04 ≤x ≥0.75) overlay has been used to obtain the permittivity at microwave frequencies in X and Ku band range. The effective dielectric constant (ε_eef) with overlay lies in the range of 10.26 to 20.69. Due to the overlay of SBN pellets a substantial increase in the effective dielectric constant was observed in X band more compared to Ku band.