Analysis of surface waves modes in planar connected arrays for radio astronomy

Rene Baelemans, Adrian Sutinjo, Bart Smolders, David Davidson, Ulf Johannsen, Randall Wayth

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)

Abstract

A planar array of closely spaced capacitively coupled antennas over a ground plane can be designed to have a broadband and smooth response, making it an interesting candidate for a low-frequency radio-astronomy instrument. However, surface wave modes propagating over the array plane can seriously degrade the response. We will show the derivation of a necessary condition for which surface wave modes will propagate along a planar array of closely spaced capacitively connected antennas. The derivation will be based upon the transverse resonance method [2] applied to the equivalent circuit of a unit cell of an infinite capacitively connected array. From the necessary condition a simple design consideration can be derived which would prevent the excitation of unwanted surface waves on the structure. Finally, we will show how adding resistive loading in the form of the low-noise amplifiers can dampen the unwanted surface wave effects.

Original languageEnglish
Title of host publicationProceedings of the 2018 20th International Conference on Electromagnetics in Advanced Applications, ICEAA 2018
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages446-449
Number of pages4
ISBN (Electronic)978-1-5386-6762-0
ISBN (Print)978-1-5386-6763-7
DOIs
Publication statusPublished - 1 Nov 2018
Event20th International Conference on Electromagnetics in Advanced Applications, ICEAA 2018 - Cartagena de Indias, Colombia
Duration: 10 Sep 201814 Sep 2018

Conference

Conference20th International Conference on Electromagnetics in Advanced Applications, ICEAA 2018
CountryColombia
CityCartagena de Indias
Period10/09/1814/09/18

Keywords

  • Connected arrays
  • Planar arrays
  • Radio astronomy
  • Surface waves

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  • Cite this

    Baelemans, R., Sutinjo, A., Smolders, B., Davidson, D., Johannsen, U., & Wayth, R. (2018). Analysis of surface waves modes in planar connected arrays for radio astronomy. In Proceedings of the 2018 20th International Conference on Electromagnetics in Advanced Applications, ICEAA 2018 (pp. 446-449). [8520459] Piscataway: Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/ICEAA.2018.8520459