Analysis of Resonator Slow-Wave Structures and Investigation of Their Characteristics Based on the Results of 3D-Modeling

In this graduation thesis, the slow-wave structures and their models used in development of amplifying devices of the millimeter range are considered. In the travelling-wave tubes, the rectangular and axially-symmetric resonator slow-wave structures (SWSs) are used. The analysis of the literature and the modern designs in the slow-wave-structures and the development of amplifying devices of the millimeter range was conducted. The periodical SWS model cell in the form of multipole was considered. The main methods of obtaining the matrix operator of the multipole are described. These methods are widely used in programs performing 3D-modeling. The analysis of the slow-wave structures in this work was conducted using HFSS. The results processing in the mathematical program Mathcad was described. The algorithms of simulation results processing in case of one (two ports) and two (four ports) microwave energy transmission channels are outlined. The characteristics obtained as the calculation result are used to construct the SWS cell model. The peculiarities of the interaction between the electrons and the field in the TWT with resonator slow-wave structures are determined by the nature of the field distribution in such structure. The TWT section model developed on basis of the discrete approach in terms of the difference form of the electrodynamical theory of excitation is presented. Analysis of the results obtained is given.