Abstract
This paper analyzes the problem of excitation of an electromagnetic wave inside a rectangular tunnel by means of the waveguide modes. As the boundary condition, the surface impedance approximation will be used. It is assumed that the separable solution can be adopted. For the excitation by a waveguide, the Wiener-Hopf solution of the two-dimensional problem is assumed to be applied. Although the results obtained are approximate, future applications are expected since an analytical expression is provided. For instance, the solution may be applied to the problem of electromagnetic wave propagation in a three-dimensional tunnel with branches and bends. In the experiment, a microwave simulation is carried out with a model of the tunnel made of concrete. It is found that the computed results and the measured results agree rather well for the electric field intensity distribution inside the tunnel.
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