V.A. Malakhov, A.S. Raevsky, S.B. Raevsky
Boundary value problems for the added waves of double-layer cylindrical guiding structures with coaxial layers are considered. Singularities of the decision of dispersion tasks for waves with unusual dependence of a field on longitudinal coordinate are described. Results of numerical determination of eigenvalues of a boundary problem for the added waves of the circular double-layer shielded waveguide are resulted.