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We consider the excitation of modes on an axial conductor in a circular tunnel by a circumferential gap. Numerical results are presented for the power into the monofilar mode and the attenuation of the mode. The power delivered to the monofilar mode increases as the conductor approaches the tunnel wall, but the attenuation also increases. The results have application to systems which use coaxial cables for long-distance communication in mine tunnels.
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Hill et al. (1974) studied this question.
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