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A three-dimensional circularly polarized antenna with a low profile and a wide 3-dB beamwidth

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  • Yingsong Li
  • Raj Mittra

Abstract

An improved three-dimensional circularly polarized quadrifilar helix antenna (QHA) with low profile and wide 3-dB beamwidth is proposed and its performance is investigated both numerically and experimentally. The proposed modified QHA is comprised of a short-circuited quadrifilar helical antenna printed on a thin FR4 substrate, with its four ports terminated by 50 Ω resistances. In addition, four monopoles with 90° phase progression are positioned around the quadrifilar helical antenna, and four Archimedean spirals are used to top-load the monopoles. Simulated and measured results show that the proposed antenna achieves a bandwidth of 23.8%, has a 3-dB beamwidth greater than 170°, and its axial ratio is less than three in the entire upper hemisphere over a wide frequency band.

Suggested Citation

  • Yingsong Li & Raj Mittra, 2016. "A three-dimensional circularly polarized antenna with a low profile and a wide 3-dB beamwidth," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 30(1), pages 89-97, January.
    • Handle: RePEc:taf:tewaxx:v:30:y:2016:i:1:p:89-97
    DOI: 10.1080/09205071.2015.1089794
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