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International Journal of Antennas and Propagation
Volume 2016, Article ID 8214153, 8 pages
http://dx.doi.org/10.1155/2016/8214153
Research Article

Study on Horizontally Polarized Omnidirectional Microstrip Antenna

School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China

Received 27 October 2015; Revised 11 December 2015; Accepted 17 December 2015

Academic Editor: Giuseppe Mazzarella

Copyright © 2016 Kun Wei 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 horizontally polarized omnidirectional microstrip antenna is proposed in this paper. The structure of designed antenna is with two back-to-back horizontally polarized microstrip antenna elements. Gain variation on main radiation plane of this new antenna is analyzed and radiation theory is deduced; formula of directivity on main radiation plane is given. Better omnidirectional characteristic of this antenna can be obtained by decreasing patch physical length. Both simulated and measured results verify the omnidirectional radiation patterns and input impedance characteristics. Good omnidirectional radiation patterns (gain variation in -plane less than ±0.4 dBi) and input impedance characteristics are obtained; moreover, cross polarization less than −20 dBi is achieved.