• DocumentCode
    998427
  • Title

    The efficiency of near-field Cassegrainian antennas

  • Author

    Fitzgerald, William

  • Author_Institution
    M.I.T. Lincoln Lab., Lexington, MA, USA
  • Volume
    20
  • Issue
    5
  • fYear
    1972
  • fDate
    9/1/1972 12:00:00 AM
  • Firstpage
    648
  • Lastpage
    650
  • Abstract
    The aperture efficiency of a near-field Cassegrainian antenna is approximated with a Fresnel field analysis. Curves are presented which give the efficiency of the system in terms of the amplitude distribution on the feed aperture and the Raleigh distance to the subreflector. It is found that separation between feed aperture and subreflector can be as great as frac{1}{2}d^{2}/\\lambda without excessive loss.
  • Keywords
    Reflector antennas, multireflector; Antenna measurements; Antenna radiation patterns; Antennas and propagation; Apertures; Diffraction; Impedance; Radar; Size measurement; Teeth; Testing;
  • fLanguage
    English
  • Journal_Title
    Antennas and Propagation, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-926X
  • Type

    jour

  • DOI
    10.1109/TAP.1972.1140269
  • Filename
    1140269
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=998427