DocumentCode :
1541653
Title :
Effects of the finite HTS film thickness on the resonant frequency of the axially symmetric TE/sub 01/spl delta// mode of a parallel plate dielectric resonator
Author :
Sang Young Lee ; Kwon, H.J. ; Suh, J.H. ; Lee, J.H. ; Jung Hur ; Fedorov, V.B.
Author_Institution :
Dept. of Phys., Konkuk Univ., Seoul, South Korea
Volume :
9
Issue :
2
fYear :
1999
fDate :
6/1/1999 12:00:00 AM
Firstpage :
2862
Lastpage :
2865
Abstract :
An axially symmetric TE/sub 01/spl delta// mode of a parallel plate dielectric resonator is studied for investigating effects of the film thickness (t) of high-temperature superconductor (HTS) films on the mode resonant frequency (f/sub 0/). A sapphire-loaded cylindrical cavity resonator with YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) endplates and mode f/sub 0/ of about 19 GHz has been prepared and its unloaded Q (Q/sub 0/) and f/sub 0/ are investigated at temperatures below the critical temperature of YBCO. From theoretical analysis, it appears that f/sub 0/ changes by less than 0.4% for different t´s when the ratio of t to the London penetration depth (/spl lambda/) is more than 10/sup -2/. Meanwhile, from experiments, significant dependence of f/sub 0/ on the gap distance (s) between the sapphire rod and the top endplate is observed with f/sub 0/ changing by about 1 GHz (/spl sim/5%) from 19.578 GHz to 18.648 GHz, as s increases from 0 to 1 mm at 77 K. The experimental values of f/sub 0/ are observed to agree well to the calculated f/sub 0/. Applicability for tunable high-Q resonators is described.
Keywords :
Q-factor; barium compounds; dielectric resonators; high-temperature superconductors; superconducting cavity resonators; superconducting thin films; yttrium compounds; 18.648 to 19.578 GHz; 77 K; London penetration depth; Q-factor; YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// endplate; YBa/sub 2/Cu/sub 3/O/sub 7/; cavity resonator; high temperature superconductor thin film; parallel plate dielectric resonator; resonant frequency; sapphire rod; Cavity resonators; Conducting materials; Conductive films; Dielectric devices; Dielectric losses; High temperature superconductors; Resonant frequency; Superconducting films; Tellurium; Yttrium barium copper oxide;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/77.783626
Filename :
783626
Link To Document :
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