Radio Science

Guided electromagnetic waves in a curved rectangular mine tunnel

Authors

  • Samir F. Mahmoud,

  • James R. Wait


Abstract

The transmission of VHF electromagnetic waves in a curved mine tunnel is analyzed using an idealized model in a cylindrical geometry. The tunnel cross section is assumed to be rectangular and the broad curved walls are imperfectly reflecting. The computations of the modal characteristics are facilitated by using a modified Airy function approximation of the rigorous cylindrical wave functions. The results indicated that the curvature of such tunnels will seriously increase the attenuation of the dominant low-order modes that are used for communications.

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