Title :
Tunable superconducting resonators using ferrite substrates
Author :
Oates, D.E. ; Dionne, G.F.
Author_Institution :
Lincoln Lab., MIT, Lexington, MA, USA
Abstract :
Tunable superconducting resonators have been demonstrated using microstrip circuits of YBCO at 77 K and niobium at 4 K coupled to polycrystalline magnetic garnet substrates. At X band and 77 K, a tuning range /spl Delta/f/f of greater than 3% and Q of 2500 have been demonstrated in applied fields of 100 Oe for YBCO. The figure of merit 2Q/spl Delta/f/f is 175. For niobium at 4 K a Q of 5000 has been demonstrated and a figure of merit of 288. An analytical model gives good agreement with the measurements.
Keywords :
Q-factor; barium compounds; high-temperature superconductors; microstrip circuits; niobium; superconducting resonators; yttrium compounds; 4 K; 77 K; Nb; Q factor; X band; YBCO; YBaCuO; ferrite substrate; figure of merit; microstrip circuit; niobium; polycrystalline magnetic garnet; tunable superconducting resonator; Circuit optimization; Coupling circuits; Ferrites; Garnets; Magnetic circuits; Microstrip resonators; Niobium; Superconducting magnets; Tunable circuits and devices; Yttrium barium copper oxide;
Conference_Titel :
Microwave Symposium Digest, 1997., IEEE MTT-S International
Conference_Location :
Denver, CO, USA
Print_ISBN :
0-7803-3814-6
DOI :
10.1109/MWSYM.1997.604579
