Experimental radio cosmology

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A compact quad-ridge orthogonal mode transducer with wide operational bandwidth

IEEE Antennas and Wireless Propagation Letters Institute of Electrical and Electronics Engineers 17:3 (2018) 422-425

Authors:

Alexander Pollak, Michael E Jones

Abstract:

We present the design and the measured performance of a compact quad-ridge orthomode transducer (OMT) operating in C-band with more than 100% fractional bandwidth. The OMT comprises two sets of identical orthogonal ridges mounted in a circular waveguide. The profile of these ridges was optimised to reduce significantly the transition length, while retaining the wide operational bandwidth of the quad-ridge OMT. In this letter, we show that the optimised compact OMT has better than -15dB return loss with the cross-polarisation well below -40dB in the designated 4.0-8.5GHz band.
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The Low Frequency Receivers for SKA1-Low: Design and Verification

Institute of Electrical and Electronics Engineers (IEEE) (2017) 1-4

Authors:

Pieter Benthem, Marchel Gerbers, Jan Geralt Bij de Vaate, Stefan Wijnholds, Jeanette Bast, Tom Booler, Tim Colgate, Brian Crosse, David Emrich, Peter Hall, Budi Juswardy, David Kenney, Franz Schlazenhaufer, Marcin Sokolowski, Adrian Sutinjo, Daniel Ung, Randall Wayth, Andrew Williams, Monica Alderighi, Pietro Bolli, Gianni Comoretto, Andrea Mattana, Jader Monari, Giovanni Naldi, Frederico Perini, Giuseppe Pupillo, Simone Rusticelli, Marco Schiaffino, Francesco Schilliro, Amin Aminei, Riccardo Chiello, Mike Jones, Jeremy Baker, Richard Bennett, Rob Halsall, Georgina Kaligeridou, Matthew Roberts, Hermine Schnetler, Jens Abraham, Eloy De Lera Accdo, Andrew Faulkner, Nima Razavi Ghods, Denis Cutajar, Andrea DeMarco, Alessio Magro, Kristian Zarb Adami
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A Herschel Space Observatory Spectral Line Survey of Local Luminous Infrared Galaxies from 194 to 671 Microns

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 230:1 (2017) ARTN 1

Authors:

N Lu, Y Zhao, T Diaz-Santos, C Kevin Xu, Y Gao, L Armus, KG Isaak, JM Mazzarella, PP van der Werf, PN Appleton, V Charmandaris, AS Evans, J Howell, K Iwasawa, J Leech, S Lord, AO Petric, GC Privon, DB Sanders, B Schulz, JA Surace
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HIPSR: A Digital Signal Processor for the Parkes 21-cm Multibeam Receiver

Journal of Astronomical Instrumentation 05:04 (2016) 1641007-1641007

Authors:

DC Price, L Staveley-Smith, M Bailes, E Carretti, A Jameson, ME Jones, W van Straten, SW Schediwy
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Observations of Galactic star-forming regions with the Cosmic Background Imager at 31 GHz

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 453:2 (2015) 2082-2093

Authors:

C Demetroullas, C Dickinson, D Stamadianos, SE Harper, K Cleary, Michael E Jones, TJ Pearson, ACS Readhead, Angela C Taylor
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