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  • 1
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    Spacecraft multibeam antenna system for 30/20 GHz (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The major technical tasks that led to the definitions of operational and demonstration multiple beam antenna (MBA) flight systems and a proof of concept model (POC) are described. Features of the POC Model and its measured performance are presented in detail. Similar MBA's are proposed for transmitting and receiving with the POC Model representing the 20 GHz transmitting antenna. This POC MBA is a dual shaped-surface reflector system utilizing a movable free array to simulate complete CONUS coverage. The beam forming network utilizes ferrite components for switching from one beam to another. Measured results for components, subsystems and the complete MBA confirm the feasibility of the approach and also show excellent correlation with calculated values.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-174654 , NASA4-1-5-Z-F , NAS 1.26:174654 , WDL-TR-10138
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A new multiple beam satellite antenna for 30/20 GHz communications coverage of CONUS-experimental evaluation (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Additional frequency bands are needed to satisfy requirements related to the rapid growth of satellite communications, and the utilization of the 30/20 GHz frequencies is being considered. The present investigation is concerned with the experimental verification phase of an antenna technology study sponsored by NASA. The feasibility of narrow (0.3 degree) directive beam scanning over the entire continental U.S. (CONUS) from a single antenna at 30/20 GHz is demonstrated. The POC (Proof-of-Concept) model is based on an employment of an offset shaped dual reflector optics. The main reflector and the subreflector are both fabricated from aluminum. Attention is given to feed array and beam-forming network, multiple beam antenna range tests, an analysis, and test results.
    Keywords: COMMUNICATIONS AND RADAR
    Type: AIAA PAPER 84-0655
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The 20 GHz proof-of-concept test model results for a multiple scan beam dual reflector antenna (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A full scale 20 GHz antenna model was designed, fabricated and tested. The model is intended to test the low sidelobe beam scanning capability of a new class of an offset dual reflector and feed array configuration. The offset main reflector and subreflector surfaces are custom shaped by a computer synthesis procedure. The derived optics result in beam scan loss under 1 db over the + or - 12.3 beamwidths by + or - 5.8 beamwidths scan volume while maintaining low sidelobes. It is found that the measured and computed patterns are in good agreement.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-174268 , NAS 1.26:174268 , IEEE Antenna Propagation Symp.; May 23, 1983 - May 27, 1983; Houston, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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