Homogeneous waveguides with both isotropic and anisotropic impedance boundaries are considered and asymptotic high-frequency mode properties are systematically derived. Among the new results are orthogonality properties of the asymptotic HF fields, existence of self-dual solutions, construction of stationary functionals, and an explicit formula for the calculation of the asymptotic attenuation coefficient for the general waveguide.
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Ismo V. Lindell (1981) studied this question.
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