Muzychyshyn B. Open oscillating systems for efficient power summation in the millimeter range

Purpose of the work consists in establishing the physical features and regularities of excitation with the help of slotted and aperture coupling elements in open oscillatory systems of higher axial-asymmetric and axial-symmetric oscillations types for effective power summation of the individual sources in the resonant volume. Object of research – physical processes of excitation, interaction and transformation of wave beams in open oscillatory systems. Theoretical and practical results. The selection of waveguide elements was carried out and an experimental stand was created for the study of physical features and regularities of oscillation excitation in open oscillatory systems. A theoretical analysis of the excitation efficiency of higher axially asymmetric and axially symmetric oscillations types in open oscillating systems was carried out. The conducted studies showed that when oscillations are excited in the resonator with the help of aperture coupling elements, in the openings of which one-dimensional E-polarized diffraction gratings with a period l>0.1λ are located, the power summation coefficient increases to 0.9. Novelty of scientific results. For the first time, it was proposed to use a E-tee waveguide when studying the power summation of two sources in the open resonator, in which the first higher axially asymmetric oscillations type TEM10q is excited. It was theoretically shown for the first time that by placing thick one-dimensional wire gratings (E-polarization) of different periods l (0.1 mm, 0.2 mm, 0.3 mm) in the openings of the aperture coupling elements, it is possible to match the resonator in which the first a higher axially asymmetric oscillations type TEM10q with a waveguide path at the frequency of the second harmonics of Hann diodes. For the first time, it is shown that with a maximum efficiency equal to 0.955, the TE01 wave is excited in a circular oversized waveguide by means of the inner ring of the field of the degenerate axially symmetric oscillations type ТЕМ*11q. For the first time, it was experimentally established that upon excitation in an open oscillating system, oscillations types are excited using slotted coupling elements made on a curvilinear reflector and shifted to the periphery of the mirrors by more than two wavelengths, axially symmetric oscillations types quasi–ТЕМ*11q and quasi–TEM*01q are excited in the resonator. Research methods. The basic methods of quasi-optics and well-known numerical methods of solving problems of electrodynamics were used to solve the tasks set in the work. In particular, the method of calculating the energy characteristics of antennas in the near zone, the test body method. Degree of implementation. The results of the work can be used to build efficient power adders in the millimeter range based on open oscillatory systems with concentrated and aperture coupling elements. Scope of use. The proposed oscillating system can be used as a power adder. The results of research on excitation in open oscillating systems with a segment of a circular waveguide of high-Q oscillations types ТЕМ*11q will allow the use of such a resonant system for measuring the electrophysical parameters of flat or cylindrical substances by the resonant method.