Implementation of an Optimised Cassegrain System for Radio Telescopes

Details Implementation of an Optimised Cassegrain System for Radio Telescopes Implementation of an Optimised Cassegrain System for Radio Telescopes

2007-12-06

arxiv.org/abs/0712.0911v1

Monthly Notices of the Royal Astronomical Society, 384: 1207-1210 (2008)

Astronomy and Astrophysics

Astrophysics

4 pages, 7 figures, to be published in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12792.x

We present the antenna design for a radio interferometer, the Arcminute Microkelvin Imager, together with its beam pattern measurement. Our aim was to develop a low-cost system with high aperture efficiency and low ground-spill across the frequency range 12-18GHz. We use a modified cassegrain system consisting of a commercially-available paraboloidal primary mirror with a diameter of 3.7m, and a shaped secondary mirror. The secondary mirror is oversized with respect to a ray-optics design and has a surface that is bent towards the primary near its outer edge using a square term for the shaping. The antennas are simple to manufacture and therefore their cost is low. The design increased the antenna gain by approximately 10 per cent compared to a normal Cassegrain system while still maintaining low contamination from ground-spill and using a simple design for the horn.

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