• DocumentCode
    972539
  • Title

    Investigation of crosspolarisation in offset Cassegrain antennas

  • Author

    Bird, T.S.

  • Author_Institution
    James Cook University of North Queensland, Department of Electrical & Electronic Engineering, Townsville, Australia
  • Volume
    17
  • Issue
    17
  • fYear
    1981
  • Firstpage
    585
  • Lastpage
    586
  • Abstract
    The geometric optics condition for zero crosspolarisation in offset Cassegrain antennas is discussed. It is shown that with a feed having perfect pattern symmetry the crosspolar performance of the offset Cassegrain is limited by diffraction. As a result minimum crosspolarisation is only achieved at the geometric optics condition when the subreflector diameter is at least 40 wavelengths.
  • Keywords
    reflector antennas; geometric optics; offset Cassegrain antennas; subreflector diameter; zero crosspolarisation;
  • fLanguage
    English
  • Journal_Title
    Electronics Letters
  • Publisher
    iet
  • ISSN
    0013-5194
  • Type

    jour

  • DOI
    10.1049/el:19810412
  • Filename
    4245888
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=972539