Legenkiy M. Propagation and radiation of pulse signals in dielectric waveguide

The object is physical processes that occur during a pulse signal propagation in open dielectric waveguide and in free space during excitation, propagation, and radiation of pulse signals. The purpose is investigation of the pulse signals propagation in dielectric waveguide and radiation of non-stationary electromagnetic signal from open end of dielectric waveguide. Mode Basis Method was applied. The new results are the following: for the first time with the help of mode basis method propagation of pulse signals in open dielectric structures was investigated; for the first time it was shown that energy of excited pulse wave in dielectric waveguide is divided into some parts: propagating inside the dielectric rod part with the speed of light in dielectric (guided wave), radiating in free space with wavefront close to spherical part (radiated wave), and propagating along the dielectric interface part with the speed of light in free space (pulse surface wave), that creates inside the dielectric rod radiation like to Cherenkov radiation; with the help of mode matching method used in time domain pulse radiation of bi-cone antenna (waveform of the radiated field is investigated close to antenna and at infinite distance from it) and dielectric rod antenna (mechanism of radiated pulse wavebeam formulation close to antenna is defined) were calculated; for the first time it was shown that during pulse E-wave diffraction on lossy medium interface in waveguide there is propagation of pulse charge wave deep into lossy medium, also part of the pulse signal with spectrum close to cut-off frequency creates surface wave on the medium boundary with damping decrement is not equal to damping decrement of pulse charge wave. Application extent: the results are planned to be applied. Application field: radiophysics and electronics.