Design and Fabrication of Switchable Superconducting Microstrip “T” Resonator with a MEM Switch

We have used a high performance (less than 0.05 dB insertion loss, greater than 30 dB isolation) high T_C superconductor based MEM switch to insert a shunt microstrip resonator into a microstrip transmission line thus forming a “T” resonator structure. This allows the insertion of a series of notches and peaks (depending on termination of the shunt line and the harmonic in use) into the transmission line’s transfer function thus forming a rudimentary switched filter. The resonator is designed for a frequency of 3.5 GHz and fits on a 15 mm × 15 mm substrate.