Title :
Two-GHz microstrip thin-film resonators of Nb and YBa/sub 2/Cu/sub 3/O/sub 7/
Author :
Goettee, J.D. ; Skocpol, W.J. ; Oates, D.E. ; Mankiewich, P.M.
Author_Institution :
Los Alamos Nat. Lab., NM, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
Dissipation and phase noise have been measured for 2-GHz linear microstrip resonators on 0.5-mm LaAlO/sub 3/. Fifty-ohm YBCO resonators with Nb ground planes (YBCO/Nb) showed quality factors of approximately 100,000 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 microhms was maintained to average current densities of 1 MA/cm/sup 2/. All-YBCO resonators were measured to higher temperatures, and showed significant excess dissipation above about 60 K. The normalized phase noise of S/sub y/=-20/spl plusmn/2 was maintained to at least 30 K. This resonator was also operated in a resonator-stabilized oscillator configuration. The effect of package interactions on microstrip devices was also investigated.<>
Keywords :
Q-factor; barium compounds; high-temperature superconductors; microstrip resonators; microwave oscillators; phase noise; superconducting microwave devices; superconducting resonators; yttrium compounds; 2 to 10 GHz; 4.2 K; 50 ohm; YBa/sub 2/Cu/sub 3/O/sub 7/-Nb; current densities; excess dissipation; high temperature superconductors; microstrip thin-film resonators; package interactions; phase noise; quality factors; resonator-stabilized oscillator configuration; surface resistance; Electrical resistance measurement; Microstrip resonators; Niobium; Noise measurement; Phase measurement; Phase noise; Surface resistance; Temperature measurement; Transistors; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
