Implementation of an optimized Cassegrain system for radio telescopes

C. M. Holler, R. E. Hills, M. E. Jones, K. Grainge, T. Kaneko

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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 12-18 GHz. We use a modified Cassegrain system consisting of a commercially available paraboloidal primary mirror with a diameter of 3.7 m, 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. © 2008 RAS.
    Original languageEnglish
    Pages (from-to)1207-1210
    Number of pages3
    JournalMonthly Notices of the Royal Astronomical Society
    Volume384
    Issue number3
    DOIs
    Publication statusPublished - Mar 2008

    Keywords

    • Instrumentation: interferometers
    • Techniques: interferometric
    • Telescopes

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