Performance of superconducting dual mode resonators with different input/output feedline angles

High-temperature superconducting (HTS) dual mode ring resonators have been fabricated using YBa/sub 2/Cu/sub 3/O/sub 7-x/ films on MgO substrates. Epitaxial YBCO superconducting thin films were deposited on MgO substrates by pulsed laser deposition (PLD). The transition temperature of YBCO thin films were 85-88 K. Dual mode ring resonators are patterned using YBCO superconducting films by conventional photolithography and wet-etching process. The opposite side of the substrate has been made up the ground plane with two layer metal films (Ti/Ag) deposited by e-beam and thermal evaporation. Two types of dual mode ring resonators were fabricated with different input and output feedline angles of 60/spl deg/ and 100/spl deg/. The frequency response shows the resonant center frequency of about 8.5 GHz and stringent narrow bandwidths. These types of dual mode ring resonators could be utilized for dual mode resonator based filters for satellite communications.