Physics of Wave Processes and Radio SystemsPhysics of Wave Processes and Radio Systems1810-31892782-294XPovolzhskiy State University of Telecommunications and Informatics1093410.18469/1810-3189.2022.25.4.88-99Research ArticleExcitation of a rectangular resonator through communication windows in the conveyor installation of microwave heatingDavidovichMikhail V.davidovichmv@info.sgu.ruKobetzAlexander K.kobetzak@info.sgu.ruSayapinKirill A.sayapin_kirill@mail.ruSaratov State UniversityLLC «NPF “Etna plus”»31122022254889925122022Copyright © 2022, Davidovich M.V., Kobetz A.K., Sayapin K.A.2022<p>Based on the excitation theory of L.A. Vainstein obtained simple and convenient iterative relations for excitation of a resonator in the form of a rectangular parallelepiped with a dielectric layer through several coupling windows in its walls. The expansion of the field in terms of the complete system of solenoidal functions of a rectangular resonator is used. Solenoidality is due to the fact that the electric fields of excitation in the openings of rectangular waveguides on the resonator walls, fed through coaxial-waveguide transitions, are tangent to the boundaries of the heated dielectric layer. Simple formulas for expansion coefficients and calculation of fields are obtained. It is convenient to solve the obtained implicit formulas iteratively; in this case, it is possible to take into account both a linear dielectric and a nonlinear dielectric, the permittivity of which depends on the square of the electric field. The algorithm is implemented to simulate a conveyor installation of microwave heating. It is possible to modify the algorithm by introducing potential basic subsystems of functions for the case of modeling complex dielectric inclusions. The results are suitable for modeling other nonlinear inclusions, as well as in problems when using volumetric given sources instead of surface ones. 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