Minimise pattern degradation when subreflector vertex shaping is used to improve feed match

M. A. Sprey*, T. S. Bird

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A knob placed at the vertex of a subreflector to reduce subreflector mismatch in a shaped Cassegrain antenna can significantly degrade the radiation pattern and reduce efficiency. A practical procedure is described to lessen these effects. Best results are obtained using a cosine-squared-shaped knob, keeping a low knob height and knob base within the feed blockage region. The importance of simultaneously optimising for return loss, antenna efficiency and sidelobe level is emphasised.

Original languageEnglish
Pages (from-to)781-782
Number of pages2
JournalElectronics Letters
Volume32
Issue number9
Publication statusPublished - 25 Apr 1996
Externally publishedYes

Keywords

  • Antenna feeds
  • Antenna radiation patterns
  • Antennas

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