Bent and Branched Microstrip-Line Antennas for Circular Polarization

Kazuhide Hirose, Kohei Nakamura, Hisamatsu Nakano

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We analyze three transmission-line antennas using the moment method. Each line antenna comprises a coplanar feed line, loops, and straight segments connecting the loops and feedline. First, we investigate bent and branched line antennas with loops on one side of the feedline. It is found that the segment length affects both the beam direction and axial ratio for the bent line antenna; in contrast, it only affects the branched line antenna’s axial ratio, resulting in a more straightforward design. Subsequently, the branched line antenna is modified with loops on both sides of the feedline to enhance the gain. It is observed that the antenna shows a gain enhancement of 2.0 dB, maintaining the same axial-ratio bandwidth as that of the original branched line antenna. The simulated results are validated by experimental work.

Original languageEnglish
Article number1711
JournalApplied Sciences (Switzerland)
Issue number3
Publication statusPublished - 2022 Feb 1


  • Array antenna
  • Circular polarization
  • Gain enhancement
  • Loop antenna
  • Series feed

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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