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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 127820, 7 pages
http://dx.doi.org/10.1155/2015/127820
Research Article

Dual Circularly Polarized Omnidirectional Antenna with Slot Array on Coaxial Cylinder

1Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2China Academy of Launch Vehicle Technology, Beijing 100076, China

Received 26 May 2015; Revised 13 July 2015; Accepted 15 July 2015

Academic Editor: Xiulong Bao

Copyright © 2015 Bin Zhou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A dual circularly polarized (CP) omnidirectional antenna based on slot array in coaxial cylinder structure is presented in this paper. It is constructed by perpendicular slot pairs around and along the axis of the coaxial cylinder to realize the omnidirectional CP property, and two ports are assigned in its two sides as left hand circularly polarized (LHCP) port and right hand circularly polarized (RHCP) port, respectively. The proposed antenna achieves a bandwidth of 16.4% ranging from 5.05 to 5.95 GHz with an isolation higher than 15 dB between the two CP ports, and the return loss (RL) is higher than 10 dB within the bandwidth in both of the two ports. From the measured results, the average axial ratio (AR) of the proposed antenna in omnidirectional plane is lower than 1.5 dB.