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Spectral performance of SKA Log-periodic Antennas I: mitigating spectral artefacts in SKA1-LOW 21 cm cosmology experiments

de Lera Acedo, E., Trott, C. M., Wayth, R. B., Fagnoni, N., Bernardi, G., Wakley, B., Koopmans, L. V. E., Faulkner, A. J. & bij de Vaate, J. G., 1-Aug-2017, In : Monthly Notices of the Royal Astronomical Society. 469, 3, p. 2662-2671 10 p.

Research output: Contribution to journalArticleAcademicpeer-review

  • Eloy de Lera Acedo
  • Cathryn M. Trott
  • Randall B. Wayth
  • Nicolas Fagnoni
  • Gianni Bernardi
  • Brett Wakley
  • Léon V. E. Koopmans
  • Andrew J. Faulkner
  • Jan Geralt bij de Vaate
This paper is the first in a series of papers describing the impact of antenna instrumental artefacts on the 21 cm cosmology experiments to be carried out by the low frequency instrument (SKA1-LOW) of the Square Kilometre Array telescope (SKA), I.e. the Cosmic Dawn (CD) and the Epoch of Reionization (EoR). The smoothness of the passband response of the current log-periodic antenna being developed for the SKA1-LOW is analysed using numerical electromagnetic simulations. The amplitude variations over the frequency range are characterized using low-order polynomials defined locally, in order to study the impact of the passband smoothness in the instrument calibration and CD/EoR Science. A solution is offered to correct a fast ripple found at 60 MHz during a test campaign at the SKA site at the Murchison Radio-astronomy Observatory, Western Australia in 2015 September with a minor impact on the telescope's performance and design. A comparison with the Hydrogen Epoch of Reionization Array antenna is also shown demonstrating the potential use of the SKA1-LOW antenna for the delay-spectrum technique to detect the EoR.
Original languageEnglish
Pages (from-to)2662-2671
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume469
Issue number3
Publication statusPublished - 1-Aug-2017

    Keywords

  • instrumentation: detectors, dark ages, reionization, first stars, LIMITATIONS, WINDOWS, POWER SPECTRUM, REIONIZATION ARRAY, HYDROGEN EPOCH, POLARIZATION LEAKAGE, SCIENCE IMPLICATIONS, FOREGROUNDS, SIMULATIONS, CALIBRATION

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