A novel dual circularly polarized microstrip antenna

Wanchu Hong, Chin-Ting Chenq, Yu-De Lin, Toshihide Kitazawa

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

5 Scopus citations


In this paper, we propose a novel design of dual circularly polarized microstrip antenna of the cogwheel-like annular ring structure. The microstrip sector stubs are added periodically in the outer and inner edges of the microstrip annular ring and an additional microstrip line as a diameter is also placed across the inner circle to enhance performance of the axial ratio. When operated in TM11 mode, this cogwheel-like microstrip annular ring antenna has a relatively wider bandwidth and a relatively smaller size than those of the traditional microstrip annular ring antenna. The three-wire transmission line and branch-line hybrid is employed as the feeding network to excite the righted-handed or left-handed direction of circular polarization.
Original languageEnglish
Title of host publication2006 EUROPEAN MICROWAVE CONFERENCE, VOLS 1-4
ISBN (Print)978-2-9600551-6-0
StatePublished - 10 Sep 2006


  • microstrip antenna; circular polarization; annular ring microstrip; branch-line hybrid

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