Curvature coupling coefficients in circumferentially corrugated circular waveguides are examined in detail in this paper. Starting from Maxwell's equations, a strict derivation is given for the curvature coupling coefficients formulae. The general exact integral expressions and the explicit expressions for any modes are obtained. From these formulae, the expressions for the coupling coefficients for any modes in smooth waveguides are obtained in the case when the slot depth approaches zero. The signs of coupling coefficients in corrugated and smooth waveguides are worked out.
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Li et al. (1991) studied this question.
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