Title :
Development of a 500-GHz band SIS mixer
Author :
Sheng-Cai Shi ; Noguchi, T. ; Inatani, J.
Author_Institution :
Nobeyama Radio Obs., Nagano, Japan
fDate :
6/1/1997 12:00:00 AM
Abstract :
This paper presents detailed experimental and analytical results for a 500-GHz tuneless waveguide SIS mixer, which is incorporated with parallel-connected twin junctions. The 500-GHz SIS mixer exhibits as low an overall receiver noise temperature as 176 K at 482 GHz, despite relatively poor quality of the SIS junction. The effect of the junction subgap leakage is therefore investigated. The experimental results are finally compared to those simulated by the quantum theory of mixing.
Keywords :
leakage currents; submillimetre wave mixers; superconducting device noise; superconductor-insulator-superconductor mixers; 500 GHz; parallel-connected twin junction; quantum theory; receiver noise temperature; simulation; subgap leakage current; tuneless waveguide SIS mixer; Circuit optimization; Critical current density; Fabrication; Observatories; Resonance; Resonant frequency; Submillimeter wave integrated circuits; Tuning; Voltage; Waveguide junctions;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
