S. M. Garanin – Post-graduate Student of Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev; Research Engineer of 3rd cat., Branch FSUE RFNC VNIIEF «Measuring System Research Institute n.a. Yu.Ye. Sedakov» (Nizhny Novgorod)

E-mail: physics@nntu.ru

I. N. Danilov – Ph.D. (Eng.), Senior Research Scientist, Branch FSUE RFNC VNIIEF «Measuring System Research Institute n.a. Yu.Ye. Sedakov» (Nizhny Novgorod)

N. A. Novoselova – Ph.D. (Eng.), Associate Professor of Department of Physics and Technology of Optical Communication,

Nizhny Novgorod State Technical University n.a. R.E. Alekseev

S. B. Raevskij – Honored Scientist of RF, Dr.Sc. (Eng.), Professor of Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev

The method of integral equations based on the Lorentz lemma has been developed. This development consists in adaptation the method to the solution of the diffraction problems of calculating transmission characteristics of twisted sections of shielded waveguides of rectangular cross section. The collocations method has been applied for algebraization of the system of integral equations. To determine the electrodynamic basis, the irregular region has been approximated by the model of a stepped-twisted waveguide. The correctness of the calculation results is guaranteed by the fulfillment of the law of conservation of energy, internal convergence and coincidence with the results obtained by other methods in test cases.

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