Numerical model simulation and experimental device examination defines the conditions of excitation and types of high-Q oscillations in irregular hybrid structures and the conditions for communication of high-Q oscillations with an aperture of a coaxial probe parts are also identified. Irregular hybrid structure in configurations discussed can be effectively used to create high-Q resonator transducers for contactless microwave diagnostics of different objects. The possibilities of the use of irregular resonator structures for the formation of ionizing microwave fields in the electrodeless sulfur lamps, and as a guide elements of light are also investigated. The analysis of resonator structures of different geometry, configuration of the field strength, which are formed, and magnitude of the field strength, amplitude-frequency characteristics are carried out.