Open AccessCompact omni‐directional circularly polarised antenna utilising bended dipoles and integrated baluns
Author(s) -
Yu Yufeng,
Xiong Jiang,
Li Hui
Publication year - 2017
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2016.0947
Subject(s) - balun , dipole antenna , optics , physics , radiation pattern , axial ratio , dipole , circular polarization , antenna measurement , coaxial antenna , directional antenna , turnstile antenna , antenna (radio) , bandwidth (computing) , computer science , engineering , electrical engineering , telecommunications , microstrip , quantum mechanics
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 E φ and E θ 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 0.27 λ 0 × 0.27 λ 0 × 0.13 λ 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.