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Optimization of multiband antennas using MATLAB environment
Žabokrtský, Michal ; Lukeš, Zbyněk (referee) ; Oliva, Lukáš (advisor)
The theme of this Bachelor thesis is the optimalization with the help of global methods and their implementation in MATLAB. Firstly, the theory of planar antennae, the ways of their use and the power supply options are analysed. As the next item, the general theory of optimalization is described. Firstly, the theories of local and global optimalization methods are mentioned. The method of Particle Swarm Optimization was chosen from the global optimalization methods. Its theory is explained and the way of applying it to optimalization of the planar antenna is mentioned. In the following part, the implementation of PSO algorithm to MATLAB environment and the usage of this method, programmed to optimalize a provided model of planar antenna in COMSOL Multiphysics, are described. The model was succesfully optimalized to required frequences (1,8 GHz and 2,4 GHz). The results of the optimalization are presented in this part, too – changes of frequency in iteration, changes of the particular measures in iterations. As the following step, the verification of the acquired results was performed in CST Microwave Studio. After considering the differences of results between COMSOL Multiphysics a CST Microwave Studio, an adjustment of the antenna to the required frequency had to be made. At the end, the results of the adjusted antenna are presented (development of return loss of antenna S11, radiating pattern and current distribution in the antenna).
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Flexible substrate antennas
Sedlák, Jakub ; Puskely, Jan (referee) ; Mikulášek, Tomáš (advisor)
This diploma thesis deals with a design of antennas based on a flexible substrate. There is also a design of a transmission line between a flexible and rigid substrate with FLEX- RIGID technology. In the first part of thesis, there is the technology, advantages and disadvantages of using this technology in design of antennas mentioned. There are also basic antenna parameters mentioned. In second part, the design of a transmission line and four antennas is presented. Two of these antennas are manufactured and measured. Finally, the measured parameters are compared with the simulated results.
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Antenna for smart watch
Hájek, Miroslav ; Láčík, Jaroslav (referee) ; Cupal, Miroslav (advisor)
The objective of this work is a create a smart watch antenna, that will operate in two frequency bands. These are GSM (1.8 GHz) and ISM (2.4 GHz) bands. This antenna must be able to work when be placed on an elastic material that is used as a smart watch belt. Antennas options are analyzed and their suitability for given use. There is also an antenna model in CST microwave studio, where all the simulations were made. The antenna is also simulated on human hand models that have different dimensions and tissue ratios.
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Multireflector fractal antenna
Mikulka, Josef ; Hertl, Ivo (referee) ; Raida, Zbyněk (advisor)
The project verifies the methodology of the design of multiband antennas with planar reflectors based on frequency selective surfaces. During the design procedure, Zeland IE3D and CST Microwave Studio are compared in detail. The final conclusion is that both the programs produce similar results.
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Flexible substrate antennas
Sedlák, Jakub ; Puskely, Jan (referee) ; Mikulášek, Tomáš (advisor)
This diploma thesis deals with a design of antennas based on a flexible substrate. There is also a design of a transmission line between a flexible and rigid substrate with FLEX- RIGID technology. In the first part of thesis, there is the technology, advantages and disadvantages of using this technology in design of antennas mentioned. There are also basic antenna parameters mentioned. In second part, the design of a transmission line and four antennas is presented. Two of these antennas are manufactured and measured. Finally, the measured parameters are compared with the simulated results.
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Antenna for smart watch
Hájek, Miroslav ; Láčík, Jaroslav (referee) ; Cupal, Miroslav (advisor)
The objective of this work is a create a smart watch antenna, that will operate in two frequency bands. These are GSM (1.8 GHz) and ISM (2.4 GHz) bands. This antenna must be able to work when be placed on an elastic material that is used as a smart watch belt. Antennas options are analyzed and their suitability for given use. There is also an antenna model in CST microwave studio, where all the simulations were made. The antenna is also simulated on human hand models that have different dimensions and tissue ratios.
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Optimization of multiband antennas using MATLAB environment
Žabokrtský, Michal ; Lukeš, Zbyněk (referee) ; Oliva, Lukáš (advisor)
The theme of this Bachelor thesis is the optimalization with the help of global methods and their implementation in MATLAB. Firstly, the theory of planar antennae, the ways of their use and the power supply options are analysed. As the next item, the general theory of optimalization is described. Firstly, the theories of local and global optimalization methods are mentioned. The method of Particle Swarm Optimization was chosen from the global optimalization methods. Its theory is explained and the way of applying it to optimalization of the planar antenna is mentioned. In the following part, the implementation of PSO algorithm to MATLAB environment and the usage of this method, programmed to optimalize a provided model of planar antenna in COMSOL Multiphysics, are described. The model was succesfully optimalized to required frequences (1,8 GHz and 2,4 GHz). The results of the optimalization are presented in this part, too – changes of frequency in iteration, changes of the particular measures in iterations. As the following step, the verification of the acquired results was performed in CST Microwave Studio. After considering the differences of results between COMSOL Multiphysics a CST Microwave Studio, an adjustment of the antenna to the required frequency had to be made. At the end, the results of the adjusted antenna are presented (development of return loss of antenna S11, radiating pattern and current distribution in the antenna).
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Multireflector fractal antenna
Mikulka, Josef ; Hertl, Ivo (referee) ; Raida, Zbyněk (advisor)
The project verifies the methodology of the design of multiband antennas with planar reflectors based on frequency selective surfaces. During the design procedure, Zeland IE3D and CST Microwave Studio are compared in detail. The final conclusion is that both the programs produce similar results.
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