V. V. Biryukov – Ph.D. (Eng.), Associate Professor, Nizhny Novgorod State Technical University n.a. R.E. Alekseev. E-mail: firstname.lastname@example.org
A lot of works has been lately devoted to analysis of complex waves in guiding structures without losses. At the same time, the questions of their existence and properties in electrodynamic systems with losses have not been considered. This paper analyzes the cha-racteristics and properties of complex waves in round double-layer waveguide in the presence of losses both in the dielectric and in the metallic walls of the structure. For formulation of the boundary value problem the impedance boundary conditions on the cylindrical sur-face of the screen have been applied and for its solution the method of partial areas has been used.
The transformation of the complex wave at various values of both loss tangent of the dielectric filling of the waveguide and conductivity of the material of the walls of the waveguide corresponding to the same coefficients of attenuation of propagating waves has been considered. In the case of conductivity, corresponding to the copper walls, any noticeable changes of the complex wave are absent. Decreasing conductivity of the walls of the waveguide leads to splitting the dispersion curve of the complex wave into two and remove them from each other. Similarly the dispersion curves behave in the case of the waveguide with ideally conducting surfaces, but with losses in the dielectric filling of the waveguide.