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Diffraction and Pattern Perturbation Effects in Offset Gregorian Reflector Antennas with Wideband Feeds

Dirk I. L. de Villiers ; Marianna Ivashina (Institutionen för signaler och system, Antennsystem)
IEEE Antennas and Propagation Society International Symposium, APS 2015; Vancouver; Canada; 19-24 July 2015 (1522-3965). p. 1520-1521. (2015)
[Konferensbidrag, refereegranskat]

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.

Nyckelord: Radio astronomy reflector antennas, wideband feeds



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Denna post skapades 2015-12-10. Senast ändrad 2016-05-24.
CPL Pubid: 227916

 

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