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The impedance cylindrical surface with a discrete change of the curvature radius is considered. It is shown, that the discrete curvature change leads to the discrete change of the charge surface density, normal component of an electric field intensity and phase velocity of a current wave. The boundary conditions for the surface current density, electric field intensity components and phase velocity in the place of discrete curvature change are formulated.

boundary conditions; impedance cylindrical surface; integral equations; surface; wedge-shaped