2-GHZ MICROSTRIP THIN-FILM RESONATORS OF NB AND YBA2CU3O7

Dissipation and phase noise have been measured for 2-GHz linear micros trip resonators on 0.5-mm . LaAlO3. Fifty-ohm YBCO resonators with Nb ground planes (YBCO/Nb) showed quality factors of approximately 100,00 0 at 2 GHz and 4.2 K, somewhat less than measured in all-Nb resonators of the same geometry. The corresponding surface resistance of 10 micr ohms was maintained to average current densities of 1 MA/cm(2). All-YB CO resonators were measured to higher temperatures, and showed signifi cant excess dissipation above about 60 K. The normalized phase noise o f S-y = -200+/-2 was maintained to at least 30 K. This resonator was a lso operated in a resonator-stabilized oscillator configuration. The e ffect of package interactions on microstrip devices was also investiga ted.