Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004exa....17..111c&link_type=abstract
Experimental Astronomy, Volume 17, Issue 1-3, pp. 111-118
Astronomy and Astrophysics
Astronomy
Low Frequency, Ska, Square Kilometre Array, Symmetric Gregorian Antenna
Scientific paper
The frequency specifications of the Square Kilometre Array (SKA) call for an optimum operation of the antenna elements from 25 down to 100 MHz. The current 12 m diameter US-SKA design is specified from 500 up to 25 GHz, with an upper goal of 35 GHz. At the low frequency end of the band (i.e., 100 MHz), a 12 m reflector antenna is about four wavelengths in diameter. Then, the question is: how well can you do, at this low frequency end of the specified band of operation for the SKA, with a symmetric reflector configuration using an ultra-wide-band prime focus feed? This paper presents the analysis of the antenna performance, in terms of Aeff/TA, of three symmetric configurations of the 12 m US-SKA antenna design between 100 and 200 MHz.
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