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    Spectral performance of SKA log-periodic antennas I: Mitigating spectral artefacts in SKA1-LOW 21 cm cosmology experiments

    261507.pdf (3.141Mb)
    Access Status
    Open access
    Authors
    de Lera Acedo, E.
    Trott, Cathryn
    Wayth, Randall
    Fagnoni, N.
    Bernardi, G.
    Wakley, B.
    Koopmans, L.
    Faulkner, A.
    bij de Vaate, J.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    de Lera Acedo, E. and Trott, C. and Wayth, R. and Fagnoni, N. and Bernardi, G. and Wakley, B. and Koopmans, L. et al. 2017. Spectral performance of SKA log-periodic antennas I: Mitigating spectral artefacts in SKA1-LOW 21 cm cosmology experiments. Monthly Notices of the Royal Astronomical Society. 469 (3): pp. 2662-2671.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stx904
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DE140100316
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/63015
    Collection
    • Curtin Research Publications
    Abstract

    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 Radioastronomy 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.

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