1. Baryon acoustic oscillations from Integrated Neutral Gas Observations: Broadband corrugated horn construction and testing.
- Author
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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., Strauss, C., Vieira, F., Villela, T., and Wang, B.
- Subjects
RADIO telescopes ,FOCAL plane arrays sensors ,TEST design ,GAUSSIAN beams ,OSCILLATIONS ,CIRCULAR polarization - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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