Title :
An SIS mixer for 85-116 GHz using inductively shunted edge-junctions
Author :
Pan, S.-K. ; Kerr, A.R. ; Feldman, M.J. ; Kleinsasser, A.W. ; Stasiak, J. ; Sandstrom, R.L. ; Gallagher, W.J.
Author_Institution :
Nat. Radio Astron. Obs., Charlottesville, VA, USA
Abstract :
A superconductor-insulator-superconductor (SIS) mixer is described that has a broadband integrated tuning structure. The mixer is tunable from 85-116 GHz, and a midband has a noise temperature of 6+or-6 K DSB (double-side-band) and unity DSB conversion gain. Referred to the mixer input flange, the receiver noise temperature is 9+or-6 K at midband. The integral tuning structure consists of a short two-wire transmission line stub with a quarter-wave superconducting transmission line as a DC and intermediate frequency (IF) block. Despite the relatively soft I-V curves of the two-junction arrays used in these mixers, low mixer noise temperature and conversion loss were achieved.<>
Keywords :
mixers (circuits); solid-state microwave circuits; solid-state microwave devices; superconducting junction devices; tuning; 85 to 116 GHz; DC/IF block; DSB conversion gain; EHF; MM-wave type; SIS mixer; broadband integrated tuning structure; double-side-band; inductively shunted edge-junctions; millimeter wave operation; short two-wire transmission line stub; superconductor-insulator-superconductor; two-junction arrays; Frequency; Impedance; Inductance; Mixers; Radio astronomy; Receivers; Superconducting device noise; Superconducting transmission lines; Tuning; Waveguide junctions;
Conference_Titel :
Microwave Symposium Digest, 1988., IEEE MTT-S International
Conference_Location :
New York, NY, USA
DOI :
10.1109/MWSYM.1988.22075
