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Proceedings Paper

Gaussian beam mode analysis of standing waves in submillimeter telescope and receiver systems
Author(s): Neil A. Trappe; Bill Lanigan; Timothy J. Finn; Willem Jellema; J. Anthony Murphy; Stafford Withington
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Paper Abstract

In this paper, we report on extending a theoretical framework based on Gaussian Beam Mode Analysis for modelling standing waves in receiver systems coupled to submillimetre wave telescopes. This analytical technique includes a full electromagnetic description of corrugated detector horns, used as a standard feed horn in the THz frequency range. In previous papers we reported on the underlining theory and described some important examples including reflections between a feed horn and telescope secondary mirror and also reflections between a horn and a plano-convex lens. As the theory uses a full multi-moded scattering matrix description within the horn, which can then be transformed to equivalent free space modes, mulitple reflections between the detector, located at the back of the horn, and any arbitrary surface in the optical path can be accurately analysed. We present an experimental validation of the model, comparing predicted standing wave patterns occuring between two corrugated horns to laboratory measurements, owrking in a frequency range around 0.1THz.

Paper Details

Date Published: 16 September 2004
PDF: 11 pages
Proc. SPIE 5497, Modeling and Systems Engineering for Astronomy, (16 September 2004); doi: 10.1117/12.551388
Show Author Affiliations
Neil A. Trappe, National Univ. of Ireland/Maynooth (Ireland)
Bill Lanigan, National Univ. of Ireland/Maynooth (Ireland)
Timothy J. Finn, National Univ. of Ireland/Maynooth (Ireland)
Willem Jellema, Space Research Organization Netherlands (Netherlands)
J. Anthony Murphy, National Univ. of Ireland/Maynooth (Ireland)
Stafford Withington, Cavendish Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 5497:
Modeling and Systems Engineering for Astronomy
Simon C. Craig; Martin J. Cullum, Editor(s)

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