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Information × Registration Number 0222U001389, 0119U002541 , R & D reports Title Investigation of formation of electromagnetic fields with given characteristics by antenna arrays with electric, magnetic and combined radiating elements. popup.stage_title Head Elisieieva Nadiia P., Доктор фізико-математичних наук Registration Date 26-01-2022 Organization V.N. Karazin Kharkiv National University popup.description2  The project is aimed at theoretical and experimental study of the the practically important features of the formation of electromagnetic fields (EM) by antennas and antenna's arrays (AA), the aperture of which is formed by multistructural systems of electric and magnetic emitters located in waveguide paths of different types and in electrodynamic volumes with perfectly conducting and impedance surfaces. The main scientific results of the work are as follows. In the frames of the method of the uniform geometric diffraction theory were solved the three-dimensional vector problems of the diffraction of low-element lattice fields from ideally conductive and impedance vibrators with arbitrary orientation, located above a perfectly conducting rectangle in the screen. Analytical expressions for interference factors in the case of linear and spatial systems of vibrators located above an ideally conducting plane are obtained. It is shown the possibility of creating vibrator's radiating systems (RS) - in the form of two orthogonal pairs of pairwise parallel in-phase excited impedance dipoles with screens - with non-mechanical control of their directional and polarization characteristics. The problem of excitation and radiation of EM waves by homogeneous and inhomogeneous systems of arc and annular slits in the screen of a coaxial line is solved. A method for improving the electrodynamic characteristics of a coaxial-slit antenna is proposed and substantiated. The calculated and experimental studies of electrodynamic characteristics and optimization of parameters of waveguide-slit AA with partial dielectric filling of the waveguide are carried out. As combined lattice emitters on the fundamental frequency, it is proposed to use traditional Klevin elements with passive monopolies, and on the alternative - pairs of active monopolies. Optimized antennas arrays of emitters based on Ш-waveguides according to the gain and the level of the side lobes of the DS are determined. Product Description popup.authors Elisieieva Nadiia P. Andreev Mykhaylo V. Berdnyk Serhii L. Blynova Nataliia K. Dumin Oleksandr M. Katrych Viktor О. Medvedev Mykola V. Nesterenko Mykhailo V. Pshenichnaya Svetlana V. popup.nrat_date 2022-03-09 Close