Penkin D. Excitation of waves in electrodynamic volumes by structures with impedance vibrator and slot elements

The dissertation focuses on the development of mathematical models for a radiating system containing impedance vibrator and slot elements as well as the determination of physical properties of its diffraction fields. The use of the developed models will simplify the design of new, more capable devices operating at SHF and EHF frequencies. By means of the method of induced electro-magneto-motive forces, we resolve the problem of wave diffraction from two- and three-element vibrator-slot structures in a rectangular waveguide with alternating-impedance vibrators. The diffraction problem on a cross slot, which has been cut in the rectangular waveguide with the finite dielectric insertion fully filling its cross-section (in the area of the slot), is solved. Based on the iteration method, the formal model for the currents of the impedance vibrator, which is situated on the conducting sphere and fed through voltage source, is developed. By using the zero-order solution and the method of induced electro-motive forces, the input impedance of a radial monopole located on the sphere is derived. Novel physical principles of electromagnetic field organization in the studied structures are perceived. The conditions, under which the radiation coefficient of both these vibrator-slot structures and the slot in the rectangular waveguide with the finite dielectric insertion tends to be unity, are manifested.