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

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.

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    http://www.smtconsultancies.co.uk/products/corrug/corrug.php

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    http://calfer.com.br/

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Acknowledgements

We thank Jeff Peterson for useful conversations about the horn testing and to Martin Bluck for careful reading of the text. BINGO is funded by FAPESP (São Paulo State Agency for Reasearch Support) through project 2014/07885-0. C.A.W. acknowledges support from CNPq through grant 313597/2014-6. We specially thank L. Reis, R. Araújo and G. Kawassaki, from LIT Antenna Testing Facility, for their superb work. M.P. acknowledges funding from a FAPESP Young Investigator fellowship, grant 2015/19936-1. E.A. wishes to thank FAPESP and CNPq for several grants. V. L. acknowledges the postdoctoral FAPESP grant 2018/02026-0. E. M. acknowledges a Ph.D. CAPES fellowship. F. V. acknowledges a CAPES M.Sc. fellowship. T.V. acknowledges CNPq Grant 308876/2014-8. Data reduction was performed using Python and the Matplotlib, Numpy and Scipy packages.

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Wuensche, C.A., Reitano, L., Peel, M.W. et al. Baryon acoustic oscillations from Integrated Neutral Gas Observations: Broadband corrugated horn construction and testing. Exp Astron 50, 125–144 (2020). https://doi.org/10.1007/s10686-020-09666-9

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Keywords

  • Radio astronomy
  • Radio telescope
  • Corrugated feed horn
  • Polariser