Regular and irregular-on-grid sparse array comparison of connected aperture arrays

Rabia Syeda (Corresponding author), David Prinsloo, Jan Geralt bij de Vaate

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Abstract

For square kilometer array (SKA) mid-frequency aperture arrays, dense connected aperture arrays such as Vivaldi antenna arrays are being considered, but to achieve the required system sensitivity for radio astronomical observations, this would mean a large number of antenna elements particularly in the order of millions. Two concepts of regular-on-grid and irregular-on-grid sparse array configuration are introduced for these connected arrays to reduce the number of antenna elements and the sensitivity performance of the two concept arrays is compared. Comparing the effective area of these two configurations, it is shown that a regular-on-grid sparse configuration achieves slightly larger effective area than an equivalent irregular-on-grid sparse configuration. Using the regular-on-grid sparse configuration as a case study, the effect that terminating impedance of the inactive antennas has on the receiver noise temperature of a connected array of Vivaldi antennas is investigated.

Original languageEnglish
Article number8988146
Pages (from-to)586-590
Number of pages5
JournalIEEE Antennas and Wireless Propagation Letters
Volume19
Issue number4
Early online date10 Feb 2020
DOIs
Publication statusPublished - 1 Apr 2020

Keywords

  • Aperture arrays , active arrays , sparse array antennas , SKA
  • square kilometer array (SKA)
  • Aperture arrays (AAs)
  • active arrays
  • sparse array antennas
  • Array signal processing
  • Vivaldi antennas
  • Receiving antennas
  • Apertures
  • Gratings
  • Gain
  • Antenna arrays

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