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Wideband and compact horizontally polarized omnidirectional antenna using composite dipole elements
Author(s) -
Yang Long,
Chen Xi,
Wu Dan,
Fu Guang,
Yan Zehong
Publication year - 2017
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21082
Subject(s) - dipole antenna , omnidirectional antenna , coaxial antenna , monopole antenna , optics , wideband , physics , standing wave ratio , antenna measurement , dipole , acoustics , antenna (radio) , microstrip antenna , electrical engineering , engineering , quantum mechanics
A wideband horizontally polarized (HP) omnidirectional antenna is constructed and experimented in this article. The antenna consists of four composite dipoles forming a circular array in the azimuth plane and four pairs of parallel strip lines as impedance transformer networks. Two kinds of dipoles compose the composite dipole to achieve a wideband operation. By utilizing the composite dipole, four resonances can be simultaneously excited and manipulated to increase the bandwidth. A prototype is manufactured to validate the method. The dimensions of the antenna are just 0.62 λ 0 × 0.62 λ 0 × 0.03 λ 0 ( λ 0 is the free‐space wavelength at center frequency). The measured results show that the presented antenna has a impedance bandwidth of 58.6% (1.63–2.98 GHz) for VSWR ≤2. The gain variations are less than 0.6 dB at the azimuth plane in the operating band. Meanwhile, the cross‐polarization is less than 20 dB and the peak gain reaches 1.7 dBi among in the band. These advantages of the antenna make it suitable for 4G mobile communication applications.