Dual-Loop Arrays Fed by Coplanar Parallel Lines for Wideband Circular Polarization

Kazuhide Hirose, Yuto Kikkawa, Hisamatsu Nakano

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Using the method of moments, we analyze three types of series-fed array antennas for circular polarization. First, we present a reference antenna's radiation characteristics with symmetrical dual loops fed by balanced parallel lines. Next, we modify the symmetrical dual loops into asymmetrical ones to enhance a circularly polarized (CP) wave bandwidth. It is found that the modified antenna has a bandwidth of 35% for a 3 dB gain-drop criterion, where the axial ratio is less than 3 dB. Finally, we use unbalanced parallel lines for feeding the asymmetrical dual loops to simplify the feed system. It is revealed that the antenna shows a CP wave bandwidth of 19%, which is twice as wide as that of the reference antenna.

Original languageEnglish
Article number9336228
Pages (from-to)478-482
Number of pages5
JournalIEEE Antennas and Wireless Propagation Letters
Issue number4
Publication statusPublished - 2021 Apr


  • Array antennas
  • circular polarization (CP)
  • loop antennas
  • series feed
  • wideband antennas

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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