Title :
Microwave measurement of surface impedance of high-T/sub c/ superconductor
Author :
Kobayashi, Y. ; Imai, T. ; Kayano, H.
Author_Institution :
Dept. of Electr. Eng., Saitama Univ., Urawa, Japan
Abstract :
Perturbation formulas for a TE/sub 011/ mode dielectric resonator and for a TE/sub 011/ mode circular cavity are derived to determine the surface impedance, z/sub s/, of superconductors from measured values of resonant frequency and unloaded Q. The Z/sub s/ values for a YBCO plate with a diameter of 30 mm were measured at 8.7, 10.4, and 23.7 GHz using these formulas. The measured results are presented as functions of temperature.<>
Keywords :
barium compounds; electric impedance measurement; high-temperature superconductors; microwave measurement; yttrium compounds; 30 mm; 8.7 to 23.7 GHz; SHF; TE/sub 011/ mode; YBCO plate; YBa/sub 2/Cu/sub 3/O/sub x/; circular cavity; dielectric resonator; high temperature superconductors; high-T/sub c/ superconductor; measured results; resonant frequency; surface impedance; surface impedance measurement; unloaded Q; Dielectric measurements; Frequency measurement; Impedance measurement; Microwave measurements; Q measurement; Resonant frequency; Superconductivity; Surface impedance; Tellurium; Yttrium barium copper oxide;
Conference_Titel :
Microwave Symposium Digest, 1990., IEEE MTT-S International
Conference_Location :
Dallas, TX
DOI :
10.1109/MWSYM.1990.99574
