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A bottom-feed omni-directional circularly polarized antenna array

Published online by Cambridge University Press:  31 May 2019

Xi Li ,
Lin Yang ,
Jia-Wei Zhao ,
Yi Liu  and
Fang-Zhou Sun
Xi Li*
Affiliation:
Science and Technology on Antenna and Microwave Laboratory, Xidian University, Xi'an, Shaanxi 710071, People's Republic of China
Lin Yang
Affiliation:
Science and Technology on Antenna and Microwave Laboratory, Xidian University, Xi'an, Shaanxi 710071, People's Republic of China
Jia-Wei Zhao
Affiliation:
Science and Technology on Antenna and Microwave Laboratory, Xidian University, Xi'an, Shaanxi 710071, People's Republic of China Twentith Research Institute of China Electronics Technology Group Corporation, No 1, Baisha Road, Yanta District, Xi'an City, Shaanxi Province, China
Yi Liu
Affiliation:
Science and Technology on Antenna and Microwave Laboratory, Xidian University, Xi'an, Shaanxi 710071, People's Republic of China
Fang-Zhou Sun
Affiliation:
Twentith Research Institute of China Electronics Technology Group Corporation, No 1, Baisha Road, Yanta District, Xi'an City, Shaanxi Province, China
*
Author for correspondence: Xi Li, E-mail: xixi1928@163.com
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Abstract

A bottom-feed omni-directional CP (circularly polarized) antenna array is proposed in this letter. The antenna array is composed of four elements (two printed ZPS (zero-phase-shift) line loops and two half-wavelength dipoles). The four elements are fed with the same phase and amplitude. The ZPS line loops provide the horizontal polarization while the dipoles provide the vertical polarization. Therefore, omni-directional circular polarization is formed in the far field. The feeding network consists of a 1–4 T-shaped power divider formed by parallel strip lines. In order to balance the amplitude of the feeding coaxial cable, the structure is used in the bottom to transfer parallel strip line to micro-strip line. Besides, the loops and the dipoles are placed on the different side of the network to guarantee the omni-directional radiation property. The measured impedance bandwidth of the fabricated antenna is 0.13 GHz (2.40–2.53 GHz) and the measured maximum CP gain at 2.45 GHz is 4.8 dBic.

Keywords

Bottom feedcircular polarizationhigh-gainomni-directional
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 11 , Issue 10 , December 2019 , pp. 1075 - 1080
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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