Zabolotnyy P. Electromagnetic fields in axially symmetrical microwave cavities with conical and cylindrical surfaces.

Object of investigation - physical processes of interaction, transformation and excitation of oscillations in axisymmetric microwave resonators with cylindrical and conical surfaces. Subject of investigation - changes in the structure of electromagnetic fields and electrodynamic parameters caused by changes in the dimensions, shape and relative position of elements of axisymmetric microwave resonators with cylindrical and conical surfaces. Methods of investigation - analytical methods of electrodynamics and microwave cavity theory, in particular the partial region method and the collocation method. The thesis is devoted to the study of the basic physical phenomena and regularities allowing one to control the properties of resonance oscillations in axially symmetrical microwave cavities which take place when the shape, dimensions, and relative position of their elements change. The thesis reports the results of a study of the features of circular cylindrical microwave cavity parameter change and electromagnetic field structure transformation under changes of the coordinates of the inner axial conductors and outer boundaries of the cavity. Resonance phenomena for the Н011, Е111, and Е112 oscillation modes in cavities in the form of a spherical sector under changes of their dimensions and base shape are analyzed. Expressions are derived to calculate the natural frequencies of Н01p biconical cavities, and a technique for the application of such expressions is presented. The effect of various manufacturing errors and coupling elements on the electromagnetic field structure and electrodynamic parameters of coaxial biconical cavities is studied. The results of experimental studies of the resonance properties of coaxial biconical cavities as a function of the longitudinal coordinates of their axial conductors are presented. Field of application - in the radioelectronic industry in the development of devices on the basis of microwave resonators with movable elements, in particular pressure and travel transducers, microwave filters and stabilizing systems for microwave generators.