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access icon free Compact omni-directional circularly polarised antenna utilising bended dipoles and integrated baluns

  • Author(s): Yufeng Yu 1 ; Jiang Xiong 2 ; Hui Li 3
    • View affiliations
    • Affiliations: 1: Institute of Antennas and Microwave Technology, School of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China ;
      2: Computational Electromagnetics Laboratory, Institute of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China ;
      3: School of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
  • Source: Volume 11, Issue 10, 16 August 2017, p. 1409 – 1414
    DOI:  10.1049/iet-map.2016.0947 , Print ISSN 1751-8725, Online ISSN 1751-8733
© The Institution of Engineering and Technology
Received 07/11/2016, Accepted 19/04/2017, Revised 12/01/2017, Published 10/05/2017

A circular-polarised antenna with omni-directional radiation is presented in this study. The proposed antenna consists of four bended dipoles, excited simultaneously by integrated baluns. The Eφ and Eθ components, generated by the horizontal and vertical parts of the bended dipoles, are shown to have a phase difference of 90°. The operating principle of achieving circular polarisation (CP) with bended dipoles are described and derived, according to which guidelines for designing CP antennas are provided. Following the guidelines, a prototype of the compact omni-directional CP antenna is fabricated, with a size of 0.27λ 0 × 0.27λ 0 × 0.13λ 0, a fractional bandwidth of 9% at 2.43 GHz and an average left-handed circular polarisation (LHCP) gain above 0.15 dBic in the operating band.

Inspec keywords: electromagnetic wave polarisation; baluns; dipole antennas; antenna radiation patterns; omnidirectional antennas; UHF antennas

Other keywords: compact omnidirectional CP antenna; omnidirectional radiation; compact omnidirectional circularly polarised antenna; frequency 2.43 GHz; integrated baluns; bended dipole

Subjects: Single antennas

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