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Reduction of wave propagation loss by mesh in rectangular tunnels

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3 Author(s)
Yamaguchi, Y. ; Dept. of Inf. Eng., Niigata Univ., Japan ; Honda, T. ; Sengoku, M.

The reduction of radio wave attenuation in rectangular tunnels is discussed. The attenuation of the dominant mode due to its field penetration into a lossy dielectric wall is reduced by means of the attachment of wire netting (mesh). First, a reflection coefficient from a mesh screen over a lossy surface is analytically evaluated. Then, based on a geometrical optical approach to the propagation model in tunnels, the attenuation of the dominant mode in a rectangular tunnel is derived using the reflection coefficient. The calculated attenuation constants are in good agreement with experimental ones obtained in a laboratory. Finally, the efficiency of attenuation reduction rate by the mesh shielding method is summarized as a function of spatial ratio of the mesh wire interval divided by the wavelength. It is shown that the efficiency of reduction rate by mesh is significant

Published in:

Electromagnetic Compatibility, IEEE Transactions on  (Volume:37 ,  Issue: 1 )

Date of Publication:

Feb 1995

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