Harmonic mixing in a series array of short superconducting weak-links
A new type harmonic mixer using a series array of short superconducting weak-links is proposed for mixer applications at far-infrared and submillimeter wave frequencies. A sizes of Josephson harmonic mixer have to be very small at the high frequencies. A saturation problem of harmonic-mixer likely be risen with increase of signal frequency, effective bandwidth and harmonic order. A shortage of mixer dynamic-range can be eliminated by the use of series array structure. Another important possibility of selectable local frequency generation has been suggested for a high-order harmonic mixer by the experimental result, in which harmonic generation is selectively heightened when the harmonic order is equal to a series number of Josephson elements. Using a eleven-elements series array, a preliminary experiment of harmonic mixing was carried out between two signals at 105.9 GHz and 5.4 - 12.6 GHz. IF output was measured for each harmonic order from 9th to 14th by optimizing local power and bias voltage. In this experiment, 5 dB heightening of the signal-to-noise ratio was obtained at the IF output when the harmonic mixing-order n is equal to the series element number N = 11.
- Research Organization:
- Communications Research Lab., Ministry of Posts and Telecommunications, Koganei-shi, Tokyo (JP); The Institute of Physical and Chemical Research, Wako-shi, Saitama (JP)
- OSTI ID:
- 5918264
- Report Number(s):
- CONF-880812-
- Journal Information:
- IEEE Trans. Magn.; (United States), Vol. 25:2; Conference: Applied superconductivity conference, San Francisco, CA, USA, 21 Aug 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
JOSEPHSON JUNCTIONS
FABRICATION
SUPERCONDUCTIVITY
HARMONIC GENERATION
EXPERIMENTAL DATA
FAR INFRARED RADIATION
OPTIMIZATION
PERFORMANCE
SIGNAL-TO-NOISE RATIO
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
FREQUENCY MIXING
INFORMATION
INFRARED RADIATION
JUNCTIONS
NUMERICAL DATA
PHYSICAL PROPERTIES
RADIATIONS
SUPERCONDUCTING JUNCTIONS
420201* - Engineering- Cryogenic Equipment & Devices
656100 - Condensed Matter Physics- Superconductivity