Thermal tuning study of a microstrip slit-tetragonal resonator with BaTiO3 material filling its gap

Computer Aided Design (CAD) of a microstrip slit-tetragonal resonator with a gap located in the middle of one of its edges has been made, using Finite Difference Time Domain (FDTD). A piece of sintered ferroelectric BaTiO3 with tetragonal crystal structure was placed on the gap of this resonator and was thermally excited using a halogen lamp. Significant change of S-parameters of the device was found in the vicinity of the Curie temperature (Tc) of BaTiO3 for the fundamental resonant mode (n = 1), as it is expected from simulations. Electric near field calculations verified the previous behavior.