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    “Phase Centers” of Far Infrared Multi-Moded Horn Antennas


    Gleeson, E. and Murphy, J.Anthony and Maffei, B. (2002) “Phase Centers” of Far Infrared Multi-Moded Horn Antennas. International Journal of Infrared and Millimeter Waves, 23. pp. 711-730. ISSN 0195-9271

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    Abstract

    Multi-moded horn antennas can be used as high efficiency feeds for bolometers when diffraction limited resolution is not required. For example, such horns are proposed for the PLANCK Surveyor, a satellite telescope due to be launched in 2007 to make definite measurements of the Cosmic Microwave Background. In a previous paper we described an accurate approach involving electromagnetic modelling using a rigorous mode matching technique to obtain both the horn aperture fields and the corresponding far field radiation patterns. In this paper we extend this description to determine the “phase center” of such horns when used on large reflecting telescopes. The “phase center” is ill defined as the individual spatially coherent fields making up the far field pattern all appear to come from different phase centers. The best average phase center location is therefore redefined in terms of the virtual beam waist position behind the horn aperture at which the focus of the telescope should be located in order to optimise angular resolution and on-axis gain for the beam on the sky. A number of alternative techniques to locating the phase center are discussed in detail in thes paper.

    Item Type: Article
    Additional Information: Cite as: Gleeson, E., Murphy, J.A. & Maffei, B. “Phase Centers” of Far Infrared Multi-Moded Horn Antennas. International Journal of Infrared and Millimeter Waves 23, 711–730 (2002). https://doi.org/10.1023/A:1015710519226
    Keywords: Multi-moded Horn Antennas; Phase center; Virtual Waist; Modal analysis;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 14178
    Identification Number: https://doi.org/10.1023/A:1015710519226
    Depositing User: Dr. Anthony Murphy
    Date Deposited: 12 Mar 2021 14:33
    Journal or Publication Title: International Journal of Infrared and Millimeter Waves
    Publisher: Springer Verlag
    Refereed: Yes
    URI:

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