Title :
A 100 GHz SIS mixer of Nb/Al-AlOx/Nb junctions
Author :
Inatani, J. ; Kasuga, T. ; Sakamoto, A. ; Iwashita, H. ; Kodaira, S.
Author_Institution :
Nobeyama Radio Observatory, Nobeyama, Japan
fDate :
3/1/1987 12:00:00 AM
Abstract :
We have made an all-refractory SIS mixer with four Nb/Al-AlOx/Nb junctions connected in series. The mixer is designed to operate at 80-120 GHz. The area of each junction is 2.5 × 2.5 μm2. Both these SIS junctions and a mm-wave choke filter are fabricated on a crystalline quartz substrate. These Nb/Al-AlOx/Nb junctions have shown ideal dc-characteristics and clear photon-assisted tunneling steps. RF measurements were made with a mixer mount which had two mechanical tuners. The conversion loss was less than 9 dB for 75-95 GHz. The minimum value was 8 dB. This value will be drastically improved by optimizing the normal resistance of the SIS junctions.
Keywords :
Millimeter-wave mixers; Superconductor insulator superconductor devices; Crystallization; Electrical resistance measurement; Filters; Inductors; Mechanical variables measurement; Niobium; Photonic crystals; Radio frequency; Tuners; Tunneling;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1987.1065164
