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Electricity signal can transferred through a wave guide but how this done if wave guide has not any wire and it is just look like a pipe ?
By allowing only specific modes of propagation of Electric and Magnetic fields to carry the energy, signal, and that is to match the boundary conditions so for example, if it is a rectangular hollow pipe, the electric field value at all time must be zero on the internal walls and in this case the TEM mode wouldn't work and the higher TM and TE modes will carry the signal
By using total reflection of the wave signal inside the wave guide
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