Journal
EXPERIMENTAL ASTRONOMY
Volume 50, Issue 1, Pages 125-144Publisher
SPRINGER
DOI: 10.1007/s10686-020-09666-9
Keywords
Radio astronomy; Radio telescope; Corrugated feed horn; Polariser
Categories
Funding
- FAPESP (Sao Paulo State Agency for Reasearch Support) [2014/07885-0]
- CNPq [308876/2014-8, 313597/2014-6]
- FAPESP Young Investigator fellowship [2015/19936-1]
- FAPESP [2018/02026-0]
- CAPES
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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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