Accession Number : AD0866969

Title :   Superconducting Receiver Techniques.

Descriptive Note : Final technical rept. Sep 68-Sep 69,

Corporate Author : AIRBORNE INSTRUMENTS LAB DEER PARK NY

Personal Author(s) : DiNardo, A. J. ; Sard, E. ; Arams, F. ; Smith, J. G.

Report Date : FEB 1970

Pagination or Media Count : 100

Abstract : The report covers research on microwave superconducting receiver techniques. An analysis of Josephson mixer operation, including characterization into a mathematical model suitable for analytical and computer study and a rigorous formulation of the generation of steps due to microwaves in the DC I-V characteristic, has been carried out. Experimental observation of the Josephson mixing action at 10 to 15 GHz has been obtained and is in agreement with the theory developed. The conversion loss, noise factor, and sensitivity of Josephson mixers have been measured. Using a point contact junction at 13 GHz, a minimum detectable signal of -90 dbm/MHz (measured) and -105 dbm/MHz (corrected) was obtained. Superconducting, miniature microstrip resonators operating at 10 to 15 GHz have been constructed using vacuum-deposited lead on low-loss sintered alumina substrate. Unloaded Q's (at 14.3 GHz) as high as 200,000 and 500,000 have been measured at 4.2 and 1.8 K respectively. The vacuum deposition technique used would permit the simulataneous fabrication of large numbers of miniature multielement filters and preselectors with low insertion loss and good skirt rejection. (Author)

Descriptors :   *SUPERCONDUCTORS), (*RADIO RECEIVERS, (*MIXERS(ELECTRONICS), SUPERCONDUCTORS), (*RESONATORS, SUPERCONDUCTORS), MICROWAVE EQUIPMENT, MATHEMATICAL MODELS, NOISE(RADIO), VAPOR PLATING.

Subject Categories : Electrical and Electronic Equipment
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE