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Planar and wired Yagi-Uda antennas
Křepela, Pavel ; Pokorný, Michal (referee) ; Mikulášek, Tomáš (advisor)
This work deals with the study of Yagi-Uda antennas, followed by analysis and design of planar antenna with wired reflector. The first part focused on the analysis of the antenna and parameters. Another part of the continuing investigation of the optimum parameters for a given antenna followed by a design in Wi-Fi 5 GHz band. The antenna is simulated in CST Microwave Studio. The final part devoted the results achieved
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Modeling the brain of a rat
Kuřátko, David ; Koudelka, Vlastimil (referee) ; Raida, Zbyněk (advisor)
This master’s thesis deals with creation and modification of several numerical rat’s brain models which are subsequently used in electromagnetic software CST Studio Suite 2014. The first part of the thesis is focused to insertion of exciting source to the model which depends on the used approach. These sources produce signals on the surface of the rat’s brain model which are then analysed. The experimental part of the thesis dealt with three different procedures of cooking agar jelly, which were used for creation of five plate capacitors, which subsequently served for measure electric properties of phantom. The conclusion of this master’s thesis is focused on comparison between results from simulations and experimental parts with a subsequent analysis of the deviations of results and their possible causes.
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3D textile integrated monopole
Füll, David ; Kufa, Martin (referee) ; Cupal, Miroslav (advisor)
This thesis deals with the design of omnidirectional monopole antennas. Using the parabolic reflector and the directors, the directional characteristics of monopole antennas are modified. This directional antenna, together with the omnidirectional antenna, examines the effect of various materials, the emission characteristics and the input reflection factor, near the antennas. These antennas are made of 3D textile, measured in anechoic chamber and compared to the designed antennas. At the end of the thesis is the summary and evaluation of the result.
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Radar cross section of passenger cars
Hanslík, Radovan ; Pítra, Kamil (referee) ; Raida, Zbyněk (advisor)
This diploma thesis is aimed at radar cross section of passenger cars. Basic scattering parameters of simple targets are described. Some numeric methods used for computing radar cross section are discussed. CST Microwave Studio is used for simulation of passenger car with two different solvers. For the results there are plots of radar cross section of a car for 1 GHz, 24.125 GHz and 33 GHz. There is a plot of visualized hotspots.
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PIFA Antenna design for GSM band
Kollár, Marcel ; Čapek, Miloslav (referee) ; Kadlec, Petr (advisor)
The main topic of this diploma thesis is a design of the PIFA antenna working in GSM bands. In the beginning there is a brief analysis of planar antennas. The thesis describes PIFA antenna and the techniques for minimization of dimensions of the antenna. Essential part of the thesis is dedicated to multicriterial optimalizaton of the antenna shape. The genetic algorithm programmed in the MATLAB enviroment cooperates with a full-wave solver CST to obrain desired impedance matching of the antenna its radiationt paterns. Also dimensions of the antenna can be minimized using the optimization procedure. Final part of the thesis compares measured data of the optimalized antenna with results obtained in CST Microwave Studio.
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Toolbox for the cooperation of MATLAB and external simulation programs
Moravec, Petr ; Sekanina, Lukáš (referee) ; Oliva, Lukáš (advisor)
In this Master's thesis scripting interface of two programs CST Microwave studio and Ansoft HFSS for the purpose of analysis of electromagnetic structures is described. The work is focuses control of these programs with help of scripting languages and system's interface of MS Windows XP. Next the process of connecting programs with MATLAB is shown on commented scripts together with an example of complete analysis of a chosen problem, and the import and export of results results in MATLAB. Further the functions which form programming interface between MATLAB and simulation programs are designed and implemented. The interconnection layer makes the complete control of simulating programs possible using the function description published in the official documentation of used simulation programs. The layer is described in reference manual in detail and it is used for optimization with use of Particle swarm optimalization (PSO) of planar antenna model. Then there is presented another usage of the layer for an implementation of global optimization methods - SOMA and DE including suggestion of process for comparison efficiency of optimization algorithms on simple electromagnetic models.
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Pixelated electrically small antenna
Turák, Samuel ; Kadlec, Petr (referee) ; Zechmeister, Jaroslav (advisor)
This bachelor thesis deals with the problematic of programming and implementation of binary evolutionary algorithms and their practical application for design of pixelated electrically small antenna for ISM band 868 MHz. Two binary evolutionary algorithms are introduced and implemented, both created in the programming environment Matlab. The basic antenna design and its optimization are performed by the program CST controlled by an in-house Matlab code. In the thesis, an empiric research of miniaturization and sensitivity of the electrically small antenna is conducted.This bachelor thesis deals with the problematic of programming and implementation of binary evolutionary algorithms and their practical application for design of pixelated electrically small antenna for ISM band 868 MHz. Two binary evolutionary algorithms are introduced and implemented, both created in the programming environment Matlab. The basic antenna design and its optimization are performed by the program CST controlled by an in-house Matlab code. In the thesis, an empiric research of miniaturization and sensitivity of the electrically small antenna is conducted.
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Operation Neptun - the turning point in perceiving the Czechoslovak television as communistic instrument of propaganda
Červená, Adéla ; Železný, Jakub (advisor) ; Suk, Pavel (referee)
- version - Adéla Červená This bachelor thesis focuses on the ground-breaking importance of the Operace Neptun in the perception of the media impact of Czechoslovak Television (ČST) by the communist regimes. Until this moment, this Operation is the only known case of the misuse of ČST before year 1968 as a tool of the contemporary propaganda and spreading of disinformation. The Czechoslovak intelligence has taken the advantage of the shooting of the show Zvědavá kamera from 1964 on the topic of the secrets of the Šumava lakes. In advance of the arrival of the publicists, they have placed boxes of allegedly Nazi documents on the bottom of the Černé jezero. The highlight of the Operation was the press conference led by the Interior Minister Lubomír Štrougal in September 1964. Would the lead actor of the Operation, Ladislav Bittman, not have emigrated, the truth would have potentially never been revealed. After the period of the Prague spring, with the rise of the normalization, the abuse of ČST as the transmitter of the current propaganda became a common practice. This work focuses on two shows of the given era - Causa Jan Masaryk and Svědectví od Seiny. The communist regime used these shows to settle the accounts with chosen representatives of the Prague spring and painted their own version of the...
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Radar cross section of passenger cars
Hanslík, Radovan ; Pítra, Kamil (referee) ; Raida, Zbyněk (advisor)
This diploma thesis is aimed at radar cross section of passenger cars. Basic scattering parameters of simple targets are described. Selected numeric methods used for computing radar cross section are discussed. Shape and size of simplified vehicle models is investigated. Simulations are verified by computing RCS of objects with well-known characteristics. Radar cross section of Skoda Octavia was simulated using selected numeric methods. Results of all performed simulations are shown in included graphs. Experimental measurment of radar cross section of a vehicle was performed so the measured data can be compared with the simulations.
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Radar cross section of passenger cars
Hanslík, Radovan ; Pítra, Kamil (referee) ; Raida, Zbyněk (advisor)
This diploma thesis is aimed at radar cross section of passenger cars. Basic scattering parameters of simple targets are described. Some numeric methods used for computing radar cross section are discussed. CST Microwave Studio is used for simulation of passenger car with two different solvers. For the results there are plots of radar cross section of a car for 1 GHz, 24.125 GHz and 33 GHz. There is a plot of visualized hotspots.
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