Research and applications of gyrotropic devices models

Darius Plonis

Doctoral dissertation

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An improvement of gyrotropic devices models (GDM), propagating electromagnetic (EM) wave characteristics and parameters research prediction, and problems of model application are discussed throughout the work. An object of the research is GDM and their usage possibilities. The aim of this dissertation is to investigate GDM wave phase and attenuation characteristics (PCh, ACh), parameters, and the possibilities of models usage.

Tasks of dissertation: improvement of GDM electrodynamical and mat-hematical models; development of computer models (algorithms and programs) for GDM wave dispersion equation calculation; to adapt artificial neural networks (ANN) for  wave PCh extraction and prediction; to estimate parameters by  using  author’s software; to calculate and investigate wave PCh and ACh, and its parameters; to create and investigate computer models of multilayer se-miconductor-dielectric waveguides (SDW); to investigate usage possibilities of GDM. The dissertation consists of four parts including Introduction, 4 chapters, Conclusions, References and 3 Annexes.

The introduction reveals the investigated problems, the importance of the thesis and the object of research. It also describes the purpose and tasks of the work, research methodology, scientific novelty, and the practical significance of results examined in the work and defended propositions. The introduction ends with the presentation of the author’s publications on the subject of the defended dissertation, and the structure of the dissertation is defined as well.

Chapter 1 revises the literature used throughout the dissertation. At the end of the chapter, the conclusions are drawn and the tasks for the dissertation are reconsidered. Chapter 2 describes gyrotropic devices electrodynamical and mathematical models. PCh are extracted and investigated by using ANN. Physical models of ferrite waveguides are investigated experimentally. The wave PCh of SDW models, as well as wave PCh and ACh of waveguides with temperature sensitive semiconductor core and anisotropic dielectric layer are analyzed in the 3rd chapter. Multilayer SDW models are investigated in the chapter too. The results of investigation of dielectric waveguides by using ANN are presented there too. The usage possibilities of GDM in EM wave phase shifters, modulators, attenuators, waveguides and filters are analyzed in the 4th chapter.

14 articles focusing on the subject of the discussed dissertation have been published: 5 articles in the Thomson ISI Register; one article in the conference material in Thomson ISI database; 3 articles in the journal quoted by Inspec database; 5 articles in international and a national conferences. 13 presentations on the subject have been presented in various conferences both nationally and internationally.

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145×205 mm
158 p.
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