Title :
High-temperature superconductive devices on sapphire
Author :
Liang, Guo-Chun ; Withers, Richard S. ; Cole, Brady F. ; Newman, Nathan
Author_Institution :
Conductus Inc., Sunnyvale, CA, USA
fDate :
1/1/1994 12:00:00 AM
Abstract :
The low-loss and uniform dielectric properties of sapphire make it attractive for high-performance microwave devices using high-temperature superconductors. YBa2Cu3O7-δ films have been deposited on oxide-buffered 5-cm-diameter wafers and demonstrated a surface resistance of 0.5 mΩ at 10 GHz and 77 K. Long (9-ns) stripline delay lines have for the first time been produced on these substrates and have a measured insertion loss of 1.5 dB at 6 GHz and 77 K. Design techniques appropriate for the dielectric anisotropy of sapphire are discussed
Keywords :
barium compounds; delay lines; high-temperature superconductors; sapphire; strip line components; superconducting microwave devices; superconducting thin films; yttrium compounds; 0.5 mohm; 1.5 dB; 10 GHz; 5 cm; 6 GHz; 77 K; 9 ns; Al2O3; HTSC; SHF; YBCO; YBa2Cu3O7-δ films; YBa2Cu3O7-Al2O3 ; dielectric anisotropy; high-temperature superconductors; insertion loss; low-loss substrate; microwave devices; oxide-buffered wafers; sapphire substrate; stripline delay lines; superconductive devices; uniform dielectric properties; Delay lines; Dielectric devices; Dielectric loss measurement; Dielectric substrates; High temperature superconductors; Stripline; Superconducting films; Superconducting microwave devices; Superconductivity; Surface resistance;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
