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    Beam Mode Expansion of Corrugated Conical Horns with Phase Correcting Lens: Application to Radioastronomy Receivers


    Garcia, E. and De Haro, L. and O'Sullivan, Créidhe and Cahill, G. and Lopez Fernandez, J.A. and Tercero, F. and Galocha, B. and Beseda, J.L. (2003) Beam Mode Expansion of Corrugated Conical Horns with Phase Correcting Lens: Application to Radioastronomy Receivers. Experimental Astronomy, 15. pp. 173-193. ISSN 0922-6435

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    Abstract

    A classical radioastronomy receiver is fed with a corrugated horn and an independent lens, both placed in a cryostat to lower the noise temperature. The beam is focused and directed using a combination of elliptical and plane mirrors. This paper proposes modifying the initial feeding system by placing the lens onto the horn aperture, thereby allowing a size reduction of the horn and lens, and a simplification of their mechanical design. The profiled lens is shaped to correct the phase error on the horn aperture. A quasi-optical model of the horn-plus-lens system has been developed using a Beam Mode Expansion (BME). Results using both a hyperbolic-planar lens and a spherical-elliptical lens, as well as results obtained by using Geometrical Optics (GO) with a Kirchoff–Huygens integration to get the far-field pattern, have been compared with measurements. As a direct application, a full focusing system for the new 40-m radiotelescope at the “Centro Astron´omico de Yebes” is presented for the 22, 30 and 45 GHz bands. This paper has developed a QO model for a corrugated conical horn with a phase-correcting lens.

    Item Type: Article
    Additional Information: García, E. de Haro, L.O'Sullivan, C.; Cahill, G. Fernández, The definitive version of this article is available at J. A. López; Tercero, F. Galocha, B. Besada, J. L. 'Beam Mode Expansion of Corrugated Conical Horns with Phase Correcting Lens: Application to Radioastronomy' Experimental Astronomy 15 pp 173-193 (2003)
    Keywords: beam mode expansion; quasi-optical systems; radioastronomy; radiotelescope;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 5938
    Depositing User: Dr. Créidhe O'Sullivan
    Date Deposited: 06 Mar 2015 17:23
    Journal or Publication Title: Experimental Astronomy
    Publisher: Kluwer Academic Publishers
    Refereed: Yes
    URI:

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