Implementation of an Optimised Cassegrain System for Radio Telescopes
| Autor: | Holler, C. M., Hills, R. E., Jones, M. E., Grainge, K., Kaneko, T. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, 384: 1207-1210 (2008) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2007.12792.x |
| Popis: | 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. Comment: 4 pages, 7 figures, to be published in MNRAS |
| Databáze: | arXiv |
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