{
  "abstract": "Mutual coupling between closely spaced elements in aperture arrays introduces narrow-band spectral features in the Embedded Element Patterns (EEPs), threatening measurements of the 21-cm power spectrum with instruments such as SKA-low. We detail a method to identify such features through the construction of frequency-independent current basis functions, utilising a singular value decomposition of frequency-dependent basis functions. We demonstrate the method on a three-element linear array and full pseudo-random station of SKA log-periodic antennas and examine the current power induced by mutual coupling. For the pseudo-random layout station we note many narrow-band resonance features, including strong resonances at 50.8~MHz and 83.6~MHz, where the coupled power on the passive antennas can approach or exceed that of the excited antenna. Simulated delay power spectra for the SKA-low core show that observing in frequency bands including resonance features causes large foreground leakage within the delay power spectra, obscuring the EoR window. For the pseudo-random layout station with SKALA4.0 we identify two significant frequency bands from 59.2--76.2~MHz and 84.2--103.3~MHz which are free of contamination from current resonances, preserving the EoR window in these frequency ranges.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.40008",
  "author_total": 6,
  "authors": [
    {
      "name": "John Cumner"
    },
    {
      "name": "Oscar S. D. O'Hara"
    },
    {
      "name": "Quentin Gueuning"
    },
    {
      "name": "Anthony Brown"
    },
    {
      "name": "Fred Dulwich"
    },
    {
      "name": "Oskar Zetterstrom"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/031tatn5dd9f8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.40008",
  "fulltext_url": null,
  "id": "031tatn5dd9f8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.40008",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.IM"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.40008",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/031tatn5dd9f8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.40008",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.40008"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    }
  ],
  "title": "Identifying narrow-band mutual coupling resonances in SKA-low stations using frequency-independent current basis functions",
  "title_text": "Identifying narrow-band mutual coupling resonances in SKA-low stations using frequency-independent current basis functions",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:45Z",
  "url": "https://research.draconitic.com/paper/031tatn5dd9f8",
  "venue": "arXiv",
  "versions": []
}