Accession Number : ADA192908

Title :   SIS (Superconductor-Insulator-Superconductor) Mixer Research.

Descriptive Note : Annual technical rept. Nov 86-Nov 87,

Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Feldman, M J

PDF Url : ADA192908

Report Date : Feb 1988

Pagination or Media Count : 12

Abstract : Theoretical and experimental research has been conducted to elucidate the basic physics behind the properties of superconductor-insulator-superconductor (SIS) tunnel junction receiving devices. The saturation of the gain of the SIS mixer was measured using both monochromatic and thermal signals, and these experiments dramatically verified the theoretical expression derived in the previous report period. A study of the role of the image termination for SIS mixer behavior found that the nonlinear quantum reactance results in an effective time delay at the input port of the mixer. Many aspects of the operation of SIS mixers at submillimeter wavelengths were clarified, including a discussion of the potential of the new oxide superconductors for this field. The goal of the realization of high quality niobium nitride edge junctions was advanced by optimizing the edge profile and by improving the insulating barrier.

Descriptors :   *INSULATION, *SUPERCONDUCTORS, BARRIERS, DELAY, GAIN, IMAGES, INPUT, JUNCTIONS, NONLINEAR SYSTEMS, OXIDES, PHYSICS, QUANTUM THEORY, REACTANCE, SATURATION, TIME INTERVALS, TUNNELING(ELECTRONICS)

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE