Title :
Miniature circulators for microwave superconducting systems
Author :
Fathy, A. ; Denlinger, E. ; Kalokitis, David ; Pendrick, V. ; Johnson, Henric ; Pique, Alberto ; Harshavardhan, K.S. ; Belohoubek, E.
Author_Institution :
David Sarnoff Res. Center, Princeton, NJ, USA
Abstract :
Ultraminiature high performance lumped element high temperature superconductor (HTS) circulators have been successfully demonstrated. Epitaxial HTS YBCO films have been deposited by pulsed laser deposition (PLD) onto buffered Yttrium Iron Garnet (YIG) substrates with measured surface resistance values (<1 m/spl Omega/ at 10 GHz @ 77 K) comparable to those of HTS films on lanthanum aluminate. The lumped element circulators occupy an area about an order of magnitude smaller in size than that of conventional disc junction circulators. Excellent low loss (<0.23 dB) and high isolation (>30 dB) over 5% bandwidth have also been demonstrated.<>
Keywords :
barium compounds; high-temperature superconductors; lumped parameter networks; microwave circulators; pulsed laser deposition; superconducting epitaxial layers; superconducting microwave devices; superconducting thin films; yttrium compounds; 0.23 dB; 10 GHz; 77 K; HTS circulators; YBaCuO; YFe5O12; YIG; buffered YIG substrates; epitaxial YBCO films; high temperature superconductor; lumped element type; microwave superconducting systems; miniature circulators; pulsed laser deposition; Circulators; Garnet films; High temperature superconductors; Pulse measurements; Pulsed laser deposition; Superconducting epitaxial layers; Superconducting films; Superconducting microwave devices; Surface resistance; Yttrium barium copper oxide;
Conference_Titel :
Microwave Symposium Digest, 1995., IEEE MTT-S International
Conference_Location :
Orlando, FL, USA
Print_ISBN :
0-7803-2581-8
DOI :
10.1109/MWSYM.1995.406067
