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

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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 Astronómico 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.

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Authors and Affiliations

  1. Grupo de Radiación, Dept. S.S.R., Universidad Politécnica de Madrid, Ciudad Universitaria, 28040, Madrid, Spain. legarcía@tsc.uc3m.es

    E. García, L. De Haro, B. Galocha & J. L. Besada

  2. Department of Physics, National University of Ireland, Maynooth, Maynooth, Co. Kildare, Ireland

    C. O'Sullivan & G. Cahill

  3. Centro Astronómico de Yebes, Instituto Geográfico Nacional, Yebes, Guadalajara, Spain

    J. A. López Fernández & F. Tercero

Authors
  1. E. García
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  2. L. De Haro
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  3. C. O'Sullivan
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  4. G. Cahill
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  5. J. A. López Fernández
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  6. F. Tercero
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  7. B. Galocha
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  8. J. L. Besada
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Correspondence to E. García.

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García, E., De Haro, L., O'Sullivan, C. et al. Beam Mode Expansion of Corrugated Conical Horns with Phase Correcting Lens: Application to Radioastronomy Receivers. Experimental Astronomy 15, 173–193 (2003). https://doi.org/10.1023/B:EXPA.0000038613.38191.5d

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  • DOI: https://doi.org/10.1023/B:EXPA.0000038613.38191.5d

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