Murphy, J.Anthony and McAuley, Ian and McCarthy, Darragh and Trappe, Neil and Gradziel, Marcin and O'Sullivan, Créidhe and Mahon, R. (2015) Quasi-optical phase retrieval of radiation patterns of non-standard horn antennas at millimetre and submillimetre wavelengths. In: 2015 9th European Conference on Antennas and Propagation (EuCAP). IEEE. ISBN 9788890701856

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Abstract

The location of the phase centres of antenna feeds is critical for optimised sensitivity and resolution on reflector antennas and telescopes. While the measurement of the far-field intensity patterns of such feeds is relatively straightforward, the direct recovery of their phase patterns requires access to expensive phase sensitive instrumentation such as a vector network analyzer. We present an inexpensive alternative quasi-optical technique, analogous to off-axis holography at visible wavelengths, that allows for the phase curvature of the feed pattern, and thus the phase centre, to be recovered with sufficient accuracy for optimizing aperture efficiency and resolution on a reflector antenna. We discuss the accuracy of the technique and compare results for the case of a specialized horn antenna for CMB polarization operating at 100GHz, using both the quasi-optical method and a vector network analyzer as a bench mark measurement tool for verification of the approach. We also include some measurements made of a lens antenna fed by a bare waveguide radiator.

Item Type:	Book Section
Additional Information:	The authors would like to acknowledge the financial support of the European Space Agency, Enterprise Ireland and the Irish Research Council for the work described in this paper.
Keywords:	horn antenna; millimeter wave; measurement; phase centre;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	9839
Depositing User:	Dr. Neil Trappe
Date Deposited:	28 Aug 2018 14:27
Publisher:	IEEE
Refereed:	Yes
Funders:	European Space Agency, Enterprise Ireland (EI), Irish Research Council
URI:	https://ieeexplore.ieee.org
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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