Investigation of frequency properties of helical and meander slow-wave systems.

There are investigated issues of modeling techniques improvement and investigation of improved design of helical and meander slow-wave systems with periodical inhomogeneities in the dissertation. Objects of research – models of slow-wave systems with periodical inhomogeneities and their methods of investigation. Aim of the work – improvement of sophisticated helical and meander slow-wave systems with periodical inhomogeneities and investigation of their methods of analysis, in order to reveal general characteristics of inhomogeneous slow-wave systems and capabilities of using computer-aided design.

The dissertation approaches major tasks such as: influence of periodical inhomogeneities to characteristics of slow-wave systems; investigation of pro-perties of helical, meander and hybrid slow-wave systems with periodical inhomogeneities; creation of automated algorithms of analysis and design of slow-wave systems using artificial neural networks.

The thesis consists of four parts including introduction, 4 chapters, conclusions, references and 2 annexes.

The introduction reveals investigated problem, importance of the thesis and object of research. It also describes the purpose and tasks of the dissertation, research methodology, scientific novelty, the practical significance  of  results  examined in the thesis and defended statements. The introduction ends in presenting the author’s publications on the subject of the defended dissertation, offering the material of made presentations in conferences and defining the structure of the dissertation.

Chapter 1 revises used literature. At the end of the chapter conclusions are drawn and the tasks for the dissertation are reconsidered.

Chapter 2 describes the methodology for calculation of input impedance and transfer coefficient characteristics of the transmission line and investigation of their methods of analysis.

Chapters 3 investigates helical, meander and hybrid slow-wave systems with periodical inhomogeneities. Methodologies for calculation input impe-dance, retardation factor and the stop-band width are selected.

In the chapters 4 are discussed the findings of research and are proven possibilities to use artificial neural networks in automated computer-added design of slow-wave systems.

9 articles focusing on the subject of the discussed dissertation are published: six articles in reviewed scientific journals, four of them in Thomson Reuters Web of Science register, tree articles – in conference proceedings. 11 presentations on the subject have been given in conferences on national and international level.

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DOI: https://doi.org/10.20334/2130-M