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An axi-symmetric segmented composite SKA dish design: Performance and production analysis

Marianna Ivashina (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; R. Bakker ; J. G. Bij De Vaate ; Oleg Iupikov (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; M. Arts ; J. Dekker ; Arnold van Ardenne (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium)
Asia-Pacific Microwave Conference, APMC 2011; Melbourne, VIC; 5 - 8 December 2011 p. 1182-1185. (2011)
[Konferensbidrag, refereegranskat]

A concept of an axi-symmetric dish as antenna reflector for the next generation radio telescope - the Square Kilometre Array (SKA) - is presented. The reflector is based on the use of novel thermoplastic composite material (reinforced with carbon fibre) in the context of the telescope design with wide band single pixel feeds. The baseline of this design represents an array of 100's to 1000's reflector antennas of 15-m diameter and covers frequencies from <1 to 10 GHz. The purpose of our study is the analysis of the production cost of the dish and its performance in combination with a realistic wideband feed (such as the 'Eleven Antenna' feed) over a wide frequency band and a range of elevation angles. The presented initial simulation results indicate the potential of the proposed dish concept for low-cost and mass production and demonstrate sensitivity comparable to that of the presently considered off-set Gregorian reflector antenna with the same projected aperture area. We expect this observation to be independent of the choice of the feed, as several other single-pixel wideband feeds (that have been reported in the literature) have similar beamwidth and phase center location, both being rather constant with frequency.

Nyckelord: axi-symmetric, composite materials, displaced-axis dual reflector systems, radio astronomy, reflector antenna feeds, wideband antenna, Aperture area, Axisymmetric, Beam widths, Elevation angle, Mass production, Phase center, Production analysis, Production cost, Reflector antenna feed, Reflector antennas, Reflector system, Single pixel, Telescope design, Thermoplastic composite material, Wide frequency bands, Wide-band, Carbon fibers, Design, Frequency bands, Pixels, Receiving antennas, Reflection, Cost benefit analysis

Denna post skapades 2012-05-30. Senast ändrad 2014-12-09.
CPL Pubid: 158253


Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium



Chalmers infrastruktur