The cutoff wavenumbers k/sub nm/ of the surface wavemodes in a Goubau line are determined by a procedure that leads directly to the eigenvalue equation in the limit of zero values for the wavenumber of the infinite exterior medium. The same result has been obtained by a much longer procedure based on an extension of previous methods used in correction with simple dielectric waveguides. Numerical results and related curves for all types of modes are also included.
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Fikioris et al. (1979) studied this question.
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