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论文类型：期刊论文

发表时间：2017-08-16

发表刊物：IET MICROWAVES ANTENNAS & PROPAGATION

收录刊物：SCIE、EI、Scopus

卷号：11

期号：10

页面范围：1409-1414

ISSN号：1751-8725

关键字：dipole antennas; omnidirectional antennas; electromagnetic wave polarisation; baluns; antenna radiation patterns; UHF antennas; compact omnidirectional circularly polarised antenna; bended dipole; integrated baluns; omnidirectional radiation; compact omnidirectional CP antenna; frequency 2; 43 GHz

摘要：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-phi and E components, generated by the horizontal and vertical parts of the bended dipoles, are shown to have a phase difference of 90 degrees. 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(0)x0.27(0)x0.13(0), a fractional bandwidth of 9% at 2.43GHz and an average left-handed circular polarisation (LHCP) gain above 0.15dBic in the operating band.