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    Radiation patterns of multi-moded horns for far-IR space applications


    Murphy, J.Anthony and Colgan, R. and O'Sullivan, Créidhe and Maffei, B. and Ade, P.A.R. (2001) Radiation patterns of multi-moded horns for far-IR space applications. Infrared Physics & Technology, 42 (6). pp. 515-528. ISSN 1350-4495

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    Abstract

    Multi-moded horn antennas are now being proposed for far-IR space imaging systems in which diffraction limited resolution is not required (e.g. the High-Frequency Instrument (HFI) on the ESA PLANCK Surveyor). In such systems individual modes in the waveguide filter section feeding the horn can couple independently to an overmoded detector (such as a bolometer in an integrating cavity). The number of modes is chosen to optimize the coupling efficiency to the source without compromising any spillover losses. We consider in detail the case of a cylindrically symmetric corrugated configuration, presenting two alternative techniques for modelling such few-moded systems. The first approach is based on a mode-matching description of propagation in a non-uniform waveguide structure, while the second approach makes use of hybrid mode solutions for a waveguide with corrugated walls assuming a uniform but non-isotropic impedance. We present practical examples comparing the radiation patterns predicted by both models.

    Item Type: Article
    Additional Information: Cite as: J.Anthony Murphy, Ruth Colgan, Creidhe O’Sullivan, Bruno Maffei, Peter Ade, Radiation patterns of multi-moded corrugated horns for far-IR space applications, Infrared Physics & Technology, Volume 42, Issue 6, 2001, Pages 515-528, ISSN 1350-4495, https://doi.org/10.1016/S1350-4495(01)00063-9
    Keywords: Multi-moded horn antennas; Bolometric detectors; Far-IR;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 14175
    Identification Number: https://doi.org/10.1016/S1350-4495(01)00063-9
    Depositing User: Dr. Anthony Murphy
    Date Deposited: 12 Mar 2021 12:06
    Journal or Publication Title: Infrared Physics & Technology
    Publisher: Elsevier
    Refereed: Yes
    Funders: Enterprise Ireland
    URI:

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