Gradient method for calculating losses in guide electrodynamic structure with imperfect shielding surfaces

The paper considers the influence of a rough surface on the propagation of waves in shielded structures, taking into account the finite conductivity of the metal. A brief overview of the most significant models of such structures is presented and a new calculation method is proposed, which is based on the principle of a gradient model of a rough surface and the concept of partial Brillouin waves. Using the developed method, a simple expression is obtained for the equivalent conductivity of a rough surface, which can be used in well-known formulas for linear losses of various guide structures.