An outer-fed spiral antenna array radiating a circularly polarized conical beam

Kazuhide Hirose, Takehisa Wada, Hisamatsu Nakano

研究成果: Article査読

3 被引用数 (Scopus)

抄録

An array composed of spiral elements, each having a small number of turns, is numerically analyzed. The spiral elements are circularly arrayed above a ground plane and are excited by a single vertical feed wire. As the number of the spiral elements increases, the copolarization component of the radiation becomes omnidirectional. The maximum variation in the copolarization component as a function of azimuth angle is 0.8 dB for four spiral elements. Attention is also paid to an improvement in the axial ratio. A technique of using parasitic wires around the feed wire is presented. Calculations show that, when the distance between the feed wire for four spiral elements and the parasitic wires is appropriately chosen, the axial ratio is improved. The 3-dB axial ratio frequency bandwidth evaluated in the maximum beam direction is found to be 10%. Within this bandwidth, the gain is more than 5 dB.

本文言語English
ページ(範囲)295-310
ページ数16
ジャーナルElectromagnetics
20
4
DOI
出版ステータスPublished - 2000 7月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 放射線
  • 電子工学および電気工学

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