Abstract
The electromagnetic waves propagating inside a parallel-plate transmission line are investigated. In the case of a finite penetration depth of the electromagnetic field into the metal, a longitudinal electric E wave propagates in the the line instead of a transverse electromagnetic wave. At small thicknesses of the dielectric this wave goes over to a Swihart wave, and at large thicknesses of the dielectric it is converted into a surface wave (plasmon). It is shown that there exists an optimum thickness of the superconducting film coating the parallel-plate transmission line, for which the electromagnetic wave experiences the maximum slowing down. Using waveguides for surface waves, one can construct surface-wave microwave resonators. These resonators have a highly uniform microwave current distribution and, have a high concentration of microwave current in the superconducting film, and they are simple to fabricate.
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