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Smith Chart Visualization Tool
Marek, Martin ; Pokorný, Michal (referee) ; Kadlec, Petr (advisor)
The objective of my bachelor thesis was to create a Smith chart visualization tool in computing environment MATLAB. I created an impedance Smith chart in graphical user interface which delineate parameters of basic line types. Parameters of transmission lines can be defined in the Smith chart as normalized impedance, reflection coefficient, normalized admittance or impedance in combination with line’s characteristic impedance. It is also possible to design simple matching circuits, e.g. with quarter-wave transformer, series stub, parallel stub or matching circuits with lumped elements.
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Optimization of the radiofrequency atomic source for deposition of GaN
Kern, Michal ; Wertheimer, Pavel (referee) ; Mach, Jindřich (advisor)
This thesis is focused on construction and optimization of radiofrequency atomic dissociation source of atomic nitrogen for depostion of GaN. The theoretical part deals with atomic sources, growth of ultrathin layers and the issue of radiofrequency circuits, with emphasis on their design using Smith chart. Methods for synthesis of GaN ultrathin layers and deposition are also discussed. In the experimental part, design and realization of various congurations of the impedance matching network is described. Using the impedance matching network a nitrogen plasma discharge was successfuly created and its spectrum was analysed. Afterwards, design and realization of a stepper motor control for the impedance matching network is described.
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Impedance matching of a transmission line in Matlab
Straka, Zdeněk ; Láčík, Jaroslav (referee) ; Štumpf, Martin (advisor)
This bachelor’s thesis is aimed at the impedance matching of transmission lines and at understanding of the Smith chart plotting. In the text are described the basic features of the transmission line theory, i.e. the behavior of voltage and current along the lines in different situations. The construction of the Smith chart is described in detail. The Smith chart serves for the transformation of impedance and reflection coefficient along the transmission line. In conclusion, advantages and disadvantages of the matched transmission line are discussed. The project presents a demonstration program using examples. The program is used for illustrative example of the matched impedance and the behavior of voltage and current along the lines in different situations
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Smith Chart Visualization Tool
Marek, Martin ; Pokorný, Michal (referee) ; Kadlec, Petr (advisor)
The objective of my bachelor thesis was to create a Smith chart visualization tool in computing environment MATLAB. I created an impedance Smith chart in graphical user interface which delineate parameters of basic line types. Parameters of transmission lines can be defined in the Smith chart as normalized impedance, reflection coefficient, normalized admittance or impedance in combination with line’s characteristic impedance. It is also possible to design simple matching circuits, e.g. with quarter-wave transformer, series stub, parallel stub or matching circuits with lumped elements.
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|
|
Impedance matching of a transmission line in Matlab
Straka, Zdeněk ; Láčík, Jaroslav (referee) ; Štumpf, Martin (advisor)
This bachelor’s thesis is aimed at the impedance matching of transmission lines and at understanding of the Smith chart plotting. In the text are described the basic features of the transmission line theory, i.e. the behavior of voltage and current along the lines in different situations. The construction of the Smith chart is described in detail. The Smith chart serves for the transformation of impedance and reflection coefficient along the transmission line. In conclusion, advantages and disadvantages of the matched transmission line are discussed. The project presents a demonstration program using examples. The program is used for illustrative example of the matched impedance and the behavior of voltage and current along the lines in different situations
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|
|
Optimization of the radiofrequency atomic source for deposition of GaN
Kern, Michal ; Wertheimer, Pavel (referee) ; Mach, Jindřich (advisor)
This thesis is focused on construction and optimization of radiofrequency atomic dissociation source of atomic nitrogen for depostion of GaN. The theoretical part deals with atomic sources, growth of ultrathin layers and the issue of radiofrequency circuits, with emphasis on their design using Smith chart. Methods for synthesis of GaN ultrathin layers and deposition are also discussed. In the experimental part, design and realization of various congurations of the impedance matching network is described. Using the impedance matching network a nitrogen plasma discharge was successfuly created and its spectrum was analysed. Afterwards, design and realization of a stepper motor control for the impedance matching network is described.
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