Diffraction and Pattern Perturbation Effects in Offset Gregorian Reflector Antennas with Wideband Feeds
Paper in proceedings, 2015

The offset Gregorian reflector system of the Square Kilometer Array radio telescope is required to operate with wideband feed (WBF) antennas down to very low frequencies, where reflectors become (electrically) relatively small. The considered WBF technologies are the log-periodic (Eleven) antenna and the quadruple-ridged flared horn. This paper investigates some of the performance degradation effects that are specific for the low frequencies and typical for these WBFs, including the feed pattern perturbations and diffraction. Several performance metrics, such as the antenna receiving sensitivity and side lobe levels are considered.

Radio astronomy reflector antennas

wideband feeds

Author

Dirk I. L. de Villiers

Stellenbosch University

Marianna Ivashina

Chalmers, Signals and Systems, Communication and Antenna Systems, Antennas

IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)

15223965 (ISSN)

1520-1521 7305149

Areas of Advance

Information and Communication Technology

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/APS.2015.7305149

ISBN

978-147997815-1

More information

Created

10/7/2017