Investigation of crosspolarisation in offset Cassegrain antennas

T. S. Bird*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The geometric optics condition for zero crosspolarization 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 crosspolarization is only achieved at the geometric optics condition when the subreflector diameter is at least 40 wavelengths. 9 refs.

Original languageEnglish
Pages (from-to)585-586
Number of pages2
JournalElectronics Letters
Volume17
Issue number17
Publication statusPublished - 1 Jan 1981

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