Multilayer microwave resonators with Bi-based dielectric ceramics

Multilayer microwave resonators were fabricated using low temperature (∼950 °C) sintered Bi-Based dielectric ceramics with high permittivity (>80). A simple structure with input/output terminals was designed with stripline to couple the resonators to external circuit. In this structure, gap-coupling capacitors were used to couple the input/output terminals to external circuit. Effect of coupling gap, the length of input/output pads and other sizes of the resonators on the resonant frequency and Q-value of the resonators was studied. The Q-value of one-port resonator is higher than 200 at 1.887 GHz and that of two-port resonators is higher than 80 at 960 MHz.