Baryon acoustic oscillations from Integrated Neutral Gas Observations: broadband corrugated horn construction and testing

Wuensche, C. A., Reitano, L., Peel, M. W., Browne, I. W. A., Maffei, B., Abdalla, E., Radcliffe, C., Abdalla, F., Barosi, L., Liccardo, V., Mericia, E., Pisano, G. ORCID: https://orcid.org/0000-0003-4302-5681, Strauss, C., Vieira, F., Villela, T. and Wang, B. 2020. Baryon acoustic oscillations from Integrated Neutral Gas Observations: broadband corrugated horn construction and testing. Experimental Astronomy 50 (1) , pp. 125-144. 10.1007/s10686-020-09666-9

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Abstract

The Baryon acoustic oscillations from Integrated Neutral Gas Observations (BINGO) telescope is a 40-m class radio telescope under construction that has been designed to measure the large-angular-scale intensity of Hi emission at 980–1260 MHz and hence to constrain dark energy parameters. A large focal plane array comprising of 1.7-metre diameter, 4.3-metre length corrugated feed horns is required in order to optimally illuminate the telescope. Additionally, very clean beams with low sidelobes across a broad frequency range are required, in order to facilitate the separation of the faint Hi emission from bright Galactic foreground emission. Using novel construction methods, a full-sized prototype horn has been assembled. It has an average insertion loss of around − 0.15 dB across the band, with a return loss around 25 dB. The main beam is Gaussian with the first sidelobe at around − 25 dB. A septum polariser to separate the signal into the two hands of circular polarization has also been designed, built and tested.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Springer
ISSN:	0922-6435
Date of First Compliant Deposit:	6 August 2020
Date of Acceptance:	21 June 2020
Last Modified:	24 Nov 2024 03:00
URI:	https://orca.cardiff.ac.uk/id/eprint/134024

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