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General properties of the "classic" open resonators without heterogeneities as the base devices while determining the particularities of new modifications of the millimeter-wave and sub-millimeter-wave band resonant structures are disclosed in the paper. The properties of open resonators with periodic metal heterogeneities, coupled open resonators as well as various modifications of resonant metal-dielectric structures are considered. The way for further investigation of new modifications of the resonant quasi-optical structures is determined from the point of view of optimization of their output parameters.

Perspectives of Application of New Modifications of Resonant Quasi-Optical Structures in EHF Equipment and Electronics