Search academic texts

Information × Registration Number 0309U003164, 0107U000690 , R & D reports Title Еxcitation, scattering and radiation of electromagnetic fields with waveguide - slot and vibrator structures in matter popup.stage_title Створення фізико-математичних моделей розрахунку електродинамічних характеристик комбінованих випромінювачів у напівнескінчених середовищах Head Katrich V, Доктор фізико-математичних наук Registration Date 24-02-2009 Organization Kharkov National University named after V.N.Karazin popup.description2 The report on SRP: 63 p., 29 figures, 5 tables, 45 sources. Object of investigation - electromagnetic fields, diffraction phenomena, processes of excitation, radiation and scattering of electromagnetic fields by impedance dipole, waveguide-slot structures any geometrical dimensions in the material medium. The purpose of the project - revealing of multiple-parameter dependence of electro-dynamic characteristics of electromagnetic fields from the geometrical dimensions and material parameters of excitable volumes and radiating structures; development of the theory and construction of physical and mathematical models of the basic types of radiating systems and their optimization in view of electro-physical characteristics of the material medium and various modes of their excitation; investigation of wave processes and revealing physical conformities of formation of existential and amplitude-phase distribution of electromagnetic fields in near-field, intermediate and far zones of radiating systems; investigation of frequency-power characteristics and characteristics of directivity, spectra of frequencies, spatial, frequency, polarizing selection of excitable fields; miniaturization of radiators and multi-element systems of linear and circular (elliptic) polarization, calculation of their fields, including in a near zone, revealing of an possibility of spatial-power localization of fields in the material medium. Methods of investigation are theoretical investigations, the computer analysis and modern methods of the numerical design. Physicomathematical models of calculation of electrodynamic characteristics of the crossed impedance vibrators system located in the absorbing medium over perfectly conducting screen; systems of any way oriented and crossed waveguide-slot-hole radiators which radiate into the medium with losses; systems of transverse slots of arbitrary length which have been cut through in an exterior conductor of a coaxial line are created. Energy and polarizing characteristics and spatial distributions of the near field intensity of systems of dipole and slot-hole radiators are investigated, basic possibility of formation in free semispace of a field of radiation with the set spatially-polarizing characteristics is shown. Basic possibility of formation in free semispace of the radiation field with the given spatially-polarizing characteristics is shown. The optimised designs of compact flat microstrip radiators which can be used as applicators at local warming up of biological tissues are offered some. ELECTROMAGNETIC FIELDS, DIFFRACTION, WAVEGUIDE-SLOT RADIATOR, DIPOLE RADIATOR, MICROSTRIP RADIATOR, NEAR ZONE, ENVIRONMENT WITH LOSSES, MULTIELEMENT STRUCTURE, MICROWAVE HYPERTHERMIA. Product Description popup.authors popup.nrat_date 2020-04-02 Close