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International Journal of Antennas and Propagation
Volume 2016, Article ID 8180124, 10 pages
http://dx.doi.org/10.1155/2016/8180124
Research Article

Effect of Antenna Parameters on the Field Coverage in Tunnel Environments

1Key Laboratory of All Optical Network & Advanced Telecommunication Network of MOE, Beijing Jiaotong University, Beijing 100044, China
2Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China

Received 9 January 2016; Revised 13 March 2016; Accepted 12 April 2016

Academic Editor: Jose-Maria Molina-Garcia-Pardo

Copyright © 2016 Dawei Li and Junhong Wang. 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

Radio wave propagation in confined spaces is consequent upon the reflections of boundaries; thus, the radiation characteristics of the antenna have significant influence on the field coverage in the confined space. This paper investigates the effects of antenna parameters on field coverage characteristics in a tunnel environment. A modified modal method is proposed to analyse the wave propagation properties along the tunnel. The relationships between the amplitudes of modes and the antenna parameters, including the beam width, beam direction, and antenna location, are analysed. The results indicate that by properly selecting the antenna parameters, optimum field coverage in tunnel environments can be realized.