Title :
Millimeter-wave detection by GBJJ using high-Tc superconducting YBaCuO films
Author :
Kita, S. ; Tanabe, H. ; Kobayashi, T.
Author_Institution :
Dept. of Control Eng., Takuma Nat. Coll. of Technol., Kagawa, Japan
fDate :
3/1/1989 12:00:00 AM
Abstract :
Millimeter-wave detection in the heterodyne mixing mode has been carried out using the high-Tc superconducting GBJJ (grain boundary Josephson junction). The GBJJ was fabricated from high Tc superconducting Y-Ba-Cu-O films, prepared on YSZ and SrTiO3 substrates using an RF sputtering technique. The junction was patterned by chemical wet etching with phosphoric acid solution. The authors carried out experiments in the heterodyne mixing mode for a signal of 35 GHz with local oscillation at 34.97 GHz. The detected IF (intermediate frequency) output power was obtained at a bias voltage lying midway between the zeroth and first Shapiro steps. A mixer conversion efficiency of -15 dB was obtained with a dynamic range of about 20 dB at 35 GHz. This result strongly implies that high-T c superconducting GBJJ works well as a detector at millimeter-wave frequencies
Keywords :
Josephson effect; barium compounds; high-temperature superconductors; microwave detectors; sputtered coatings; superconducting junction devices; superconducting thin films; yttrium compounds; 35 GHz; IF output; MM-wave detection; RF sputtering; Shapiro steps; SrTiO3 substrates; YBaCuO films; ZrO2-Y2O3 substrate; bias voltage; chemical wet etching; dynamic range; grain boundary Josephson junction; heterodyne mixing mode; high temperature superconductor; mixer conversion efficiency; Chemicals; Grain boundaries; Josephson junctions; Millimeter wave technology; Power generation; Radio frequency; Sputtering; Superconducting films; Wet etching; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
