Accession Number:

ADA171539

Title:

Josephson Effect Detectors of Microwave and Far Infrared Radiation.

Descriptive Note:

Final technical rept. 1 Dec 84-31 May 86.

Corporate Author:

CALIFORNIA UNIV BERKELEY DEPT OF PHYSICS

Personal Author(s):

Report Date:

1986-05-31

Pagination or Media Count:

4.0

Abstract:

This contract terminates nearly ten years of Navy support for the invention and development of superconducting quasiparticle heterodyne receivers for millimeter wavelength radiation. Quantum effects such as mixer conversion gain and noise comparable to the limit set by the Heisenberg uncertainty principle have been experimentally observed. Mixer response at 36 and 90 GHz has been studied as a function of parameters such as RF and IF embedding impedance, local oscillator power, bias voltage, junction I-V curve, and operating temperature. Comparisons have been made with SIS mixer theory and good agreement has generally been found. These mixers are being used full time in heterodyne receiver systems at several radio astronomical observatories. They are the lowest noise millimeter wave receivers available today.

Descriptors:

• *INFRARED RADIATION
• *MIXERS(ELECTRONICS)
• *MICROWAVE RECEIVERS
• TEMPERATURE
• HETERODYNING
• SUPERCONDUCTORS
• MILLIMETER WAVES
• QUANTUM ELECTRONICS
• NOISE
• RADIOFREQUENCY
• NAVAL EQUIPMENT
• LOCAL OSCILLATORS
• LOW NOISE
• INTERMEDIATE FREQUENCIES
• MICROWAVE AMPLIFIERS

Subject Categories:

• Electrical and Electronic Equipment
• Optics
• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE