Electromagnetic Wave Propagation in a Two-Dimensional Tunnel with a Modified Cross-Junction.

This paper investigates theoretically and experimentally the electromagnetic wave propagation in a two-dimensional tunnel with a modified cross-junction in connection with radio communications in tunnels, underground, urban areas with high-rise buildings and others. Modal expansions and Fourier transform are used as an analytical method, and the surface impedance model is employed as a boundary condition on the tunnel walls. The results presented here can be applied to special tunnels such as the T-type, modified T-type, L-type and step-type. Experiments based on a microwave simulation are performed by using tunnels composed of concrete slabs. It is found that, concerning electric field intensity, experimental and theoretical results agree well. [ABSTRACT FROM AUTHOR]