A thin film resonator which combines a microstrip resonator structure and a coplanar
resonator structure to form an integrated resonator structure. The resonant frequency
of this resonator structure is independent of the substrate thickness within a
certain thickness range. This resonator structure also has a very economical size,
as compared to other existing resonator designs. Different coupling configurations
between the resonators are shown with the resulting coupling coefficients. Also
a two-pole, four-pole and an eight-pole filter are designed using the thin film
resonator and the insertion loss and return loss characteristics for various filters
are shown.
