Abstract
AbstractAs an example of tunnels with a branch and a bend, the one with a T‐junction is selected for analysis of electromagnetic wave propagation when it is excited with a line source. As the boundary condition on the tunnel wall, a surface impedance approximation has been introduced. The calculations have been performed with the introduction of a two‐dimensional model. In the calculation, the tunnel is divided into the source region (Tunnel I) and the remainder (Tunnel II). The field in the former is modal expanded in a series with unknown coefficients; in the latter a Fourier transform is introduced so that the field is treated in the transform domain. The field matching at the aperture is performed in the Fourier‐transformed domain so that the unknown expansion coefficients described above can be obtained as the solutions of an infinite set of simultaneous equations. Finally, the numerical results are compared with those of a model experiment and the effectiveness of the surface impedance approximation is discussed. It is found that the numerical and experimental results agree rather well for the electric field intensity distribution in Tunnel II.
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