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  • 1
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    Performance of a four-element Ka-band high-temperature superconducting microstrip antenna (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-12-09
    Description: Superconducting four-element microstrip array antennas operating at 30 GHz have been designed and fabricated on a lanthanum aluminate (LaAlO3) substrates. The experimental performance of these thin film Y-Ba-Cu-O superconducting antennas is compared with that of identical antenna patterned with evaporated gold. Efficiency measurements of these antennas show an improvement of 2 dB at 70 K and as much as 3.5 dB at 40 K in the superconducting antenna over the gold antenna.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Microwave and Guided Wave Letters (ISSN 1051-8207); 2; 4, Ap
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    GAS payload no. G-025: Study of liquid sloshing behaviour in microgravity (1986)
    In:  CASI
    Details
    Publication Date: 2006-06-12
    Description: The Get Away Special (GAS) G-025, which flew on shuttle Mission 51-G, examined the behavior of a liquid in a tank under microgravity conditions. The experiment is representative of phenomena occurring in satellite tanks with liquid propellants. A reference fluid in a hemispherical model tank will be subjected to linear acceleration inputs of known levels and frequencies, and the dynamic response of the tank liquid system was recorded. Preliminary analysis of the flight data indicates that the experiment functioned perfectly. The results will validate and refine mathematical models describing the dynamic characteristics of tank-fluid systems. This will in turn support the development of future spacecraft tanks, in particular the design of propellant management devices for surface tension tanks.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Goddard Space Flight Center The 1985 Get Away Special Experimenter's Symposium; p 165-176
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Measurement techniques for cryogenic Ka-band microstrip antennas (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The measurement of cryogenic antennas poses unique logistical problems since the antenna under test must be embedded in the cooling chamber. A method for measuring the performance of cryogenic microstrip antennas using a closed cycle gas-cooled refrigerator in a far field range is described. Antenna patterns showing the performance of gold and superconducting Ka-band microstrip antennas at various temperatures are presented.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Solid State Technology Branch of NASA Lewis Research Center; p 151-157
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Computer facilities optimization studies (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A comprehensive plan was developed to determine the best options for integrating and upgrading various ADP systems in scientific research environments, such as at NASA Ames Research Center.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: NASA-CR-192702 , NAS 1.26:192702
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Measurement techniques for cryogenic Ka-band microstrip antennas (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The measurement of cryogenic antennas poses unique logistical problems since the antenna under test must be embedded in a cooling chamber. A method of measuring the performance of cryogenic microstrip antennas using a closed cycle gas cooled refrigerator in a far field range is described. Antenna patterns showing the performance of gold and superconducting Ka-band microstrip antennas at various temperatures are presented.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-TM-105183 , E-6479 , NAS 1.15:105183 , Annual Meeting and Symposium of the Antenna Measurement Techniques Association; Oct 07, 1991 - Oct 11, 1991; Boulder, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Computing Radiation From Axisymmetric Waveguide Feed Horns (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Hybrid finite-element method developed for computing radiation patterns and reflection coefficients of axisymmetric waveguide feed horns that include dielectric bodies like rods and radomes. Dielectric inhomogeneities introduced by such bodies and even anisotropies of some dielectric materials pose no special problem in method because requisite dielectric properties readily incorporated into finite elements used to model bodies.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-19558 , NASA Tech Briefs (ISSN 0145-319X); 20; 6; P. 46
    Format: text
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    NASA TECHNICAL REPORTS
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