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Nasrin Nasresfahani
Application of Metamaterials in Microwave Resonators and Slow Wave Structures
Although potential application of metamaterials (MTMs) in various areas of optics and electromagnetics has been investigated to a great extent in the recent years, interaction of free electrons with MTMs or more precisely MTM loaded slow wave structures (SWSs) which may result in vacuum devices with superior performance is one of the areas that has not been extensively considered in the literature.
In this thesis, the SWS of a specific type of vacuum electronic devices called spatial harmonic magnetron (SHM) has been considered, then by developing a novel approximate theory it has been shown that loading the SWS of a SHM with a specific type of MTMs can enhance beam wave interaction and as a consequence improve the output power and efficiency of this device. Details of the realization of the MTM loaded SWS has been presented and a 41 GHz MTM loaded SHM has been designed. By developing an accurate simulation model in CST-Particle Studio, the hot cathode performance of the MTM loaded SHM has been compared with that of its conventional counterpart at 41 GHz.
Before involving in the complexity of the beam wave interaction in a MTM loaded SWS, MTM loaded cylindrical and coaxial cylindrical resonators have been investigated in this thesis. These investigations revealed interesting miniaturization possibilities for both TE and TM mode cylindrical resonators and, on the other hand, provide the preliminary tools and steps for analyzing the MTM loaded SWS. Presenting the dispersion relations of the MTM loaded resonators in a generally anisotropic case has revealed the possibility of employing less complex anisotropic MTMs instead of their complex isotropic counterparts in order to realize miniaturized resonators.
In this thesis, the SWS of a specific type of vacuum electronic devices called spatial harmonic magnetron (SHM) has been considered, then by developing a novel approximate theory it has been shown that loading the SWS of a SHM with a specific type of MTMs can enhance beam wave interaction and as a consequence improve the output power and efficiency of this device. Details of the realization of the MTM loaded SWS has been presented and a 41 GHz MTM loaded SHM has been designed. By developing an accurate simulation model in CST-Particle Studio, the hot cathode performance of the MTM loaded SHM has been compared with that of its conventional counterpart at 41 GHz.
Before involving in the complexity of the beam wave interaction in a MTM loaded SWS, MTM loaded cylindrical and coaxial cylindrical resonators have been investigated in this thesis. These investigations revealed interesting miniaturization possibilities for both TE and TM mode cylindrical resonators and, on the other hand, provide the preliminary tools and steps for analyzing the MTM loaded SWS. Presenting the dispersion relations of the MTM loaded resonators in a generally anisotropic case has revealed the possibility of employing less complex anisotropic MTMs instead of their complex isotropic counterparts in order to realize miniaturized resonators.
Schlagwörter: Metamaterials; Resonators; Slow wave structure; spatial harmonic magnetron
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