# Propagation Mechanism modeling in the Near-Region of Arbitrary Cross-Sectional Tunnels.

Briso Rodriguez, Cesar and Guan, Ke and Zhong, Zhangdui and Ai, Bo and He, Ruisi and Li, Yuanxuan (2012). Propagation Mechanism modeling in the Near-Region of Arbitrary Cross-Sectional Tunnels.. "International Journal of Antennas And Propagation", v. 2012 (n. 183145); pp.. ISSN 1687-5869. https://doi.org/10.1155/2012/183145.

## Description

Title: Propagation Mechanism modeling in the Near-Region of Arbitrary Cross-Sectional Tunnels. Briso Rodriguez, Cesar Guan, Ke Zhong, Zhangdui Ai, Bo He, Ruisi Li, Yuanxuan Article International Journal of Antennas And Propagation 2012 1687-5869 2012 E.U.I.T. Telecomunicación (UPM) Ingeniería Audiovisual y Comunicaciones Recognition - No derivative works - Non commercial

## Abstract

Along with the increase of the use of working frequencies in advanced radio communication systems, the near-region inside tunnels lengthens considerably and even occupies the whole propagation cell or the entire length of some short tunnels. This paper analytically models the propagation mechanisms and their dividing point in the near-region of arbitrary cross-sectional tunnels for the first time. To begin with, the propagation losses owing to the free space mechanism and the multimode waveguide mechanism are modeled, respectively. Then, by conjunctively employing the propagation theory and the three-dimensional solid geometry, the paper presents a general model for the dividing point between two propagation mechanisms. It is worthy to mention that this model can be applied in arbitrary cross-sectional tunnels. Furthermore, the general dividing point model is specified in rectangular, circular, and arched tunnels, respectively. Five groups of measurements are used to justify the model in different tunnels at different frequencies. Finally, in order to facilitate the use of the model, simplified analytical solutions for the dividing point in five specific application situations are derived. The results in this paper could help deepen the insight into the propagation mechanisms in tunnels.

Item ID: 15328 https://oa.upm.es/15328/ oai:oa.upm.es:15328 10.1155/2012/183145 http://www.hindawi.com/journals/ijap/2012/183145/ Memoria Investigacion 03 Oct 2013 11:53 21 Apr 2016 15:23

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