Accession Number : AD0704906

Title :   THE JOSEPHSON JUNCTION AS A 100 GHz OSCILLATOR-MIXER,

Corporate Author : ROCHESTER UNIV N Y DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Longacre,Andrew , Jr. ; Shapiro,Sidney

Report Date : APR 1970

Pagination or Media Count : 26

Abstract : The term 'Josephson effects' refers to a number of unusual properties of current flow through a barrier or weak link between two superconductors. Such a structure--called a Josephson junction--gives rise to frequency conversion effects that suggest its use as an oscillator-mixer in the millimeter and submillimeter region. Such a device would offer high sensitivity, broad bandwidth, tunability, and, in certain modes of operation, the possibility of conversion gain. These frequency conversion effects were observed in the range of 100 GHz to 600 GHz and beyond. The junctions were driven by a 75 GHz or 25 GHz klystron while coupled either to a coaxial cavity resonant at 20 GHz or to a resonance at about 500 GHz associated with the junction structure. Lines in the junction voltage-current characteristic were observed which demonstrated that, at certain values of junction bias, power at the rf--or its harmonics--was converted to power at the resonance frequency. An explanation of the experiment is given together with the necessary background, which provides the basis for a discussion of such operational considerations as upper frequency limit, sensitivity, temperature of operation, and saturation behavior at high signal levels. (Author)

Descriptors :   (*FREQUENCY CONVERTERS, *SUBMILLIMETER WAVES), (*MIXERS(ELECTRONICS), SUBMILLIMETER WAVES), (*MICROWAVE OSCILLATORS, FEASIBILITY STUDIES), (*SUPERCONDUCTORS, *TUNNELING(ELECTRONICS)), MILLIMETER WAVES, INTERFACES

Subject Categories : Electrical and Electronic Equipment
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE