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Suppression of side lobes of an antenna array by unequal power distribution on the elements
Saloka, Samuel ; Mikulášek, Tomáš (referee) ; Špůrek, Jan (advisor)
This bachelor thesis is focused on the design of an antenna array with four patch antennas. In the first part, the theory of a microstrip antenna and power divider with equal and unequal power distribution on elements design are summarized. In the second part, calculations necessary for the design of the antenna and both arrays are found. The third part contains modeling, optimizations and simulation results of the individual models and consequently the assessment of the results. A summarization of the measured results as well as photo documentation of the produced structures are in the fourth part. Conclusion of the entire work and its results are deliberated in last part.
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Ionic fields of various kinds and method of measurement.
Gubani, Ondřej ; Vaněk, Jiří (referee) ; Vognar, Jiří (advisor)
In the air there are positively and negatively charged ions with different mobility and size. The therapeutic effect of negative ions with high mobility is known. High concentration of negative ions occurs in speleotherapic caves. This bachelor thesis introduces the methods of measuring the concentration and mobility of various kinds of ions and their evaluation by spectral characteristics. It verifies the current mirror effect on the ions´ concentration in space. It also examines the effect of different types of ions in living organisms and an appropriate area treatment for the occurrence of negative ions.
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Workplace for testing of the laser diodes
Zemánek, Martin ; Tannenberg, Milan (referee) ; Wilfert, Otakar (advisor)
Bachelor thesis is focused on laser diodes and proposal in their workplace testing, followed by constructing workplace with program for graphical output with processed values of measurment. Laser diodes paramaters as optical power, symmetry of the laser beam and radiation characteristic are the objective of this thesis. Thesis includes the theory of laser diodes, device list, workplace layout, description of measurment methods, followed by measuring and and processing the values in program with graphical output. Resulting values are compared with catalog data.
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Suppression of side lobes of an antenna array by unequal power distribution on the elements
Saloka, Samuel ; Mikulášek, Tomáš (referee) ; Špůrek, Jan (advisor)
This bachelor thesis is focused on the design of an antenna array with four patch antennas. In the first part, the theory of a microstrip antenna and power divider with equal and unequal power distribution on elements design are summarized. In the second part, calculations necessary for the design of the antenna and both arrays are found. The third part contains modeling, optimizations and simulation results of the individual models and consequently the assessment of the results. A summarization of the measured results as well as photo documentation of the produced structures are in the fourth part. Conclusion of the entire work and its results are deliberated in last part.
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Workplace for testing of the laser diodes
Zemánek, Martin ; Tannenberg, Milan (referee) ; Wilfert, Otakar (advisor)
Bachelor thesis is focused on laser diodes and proposal in their workplace testing, followed by constructing workplace with program for graphical output with processed values of measurment. Laser diodes paramaters as optical power, symmetry of the laser beam and radiation characteristic are the objective of this thesis. Thesis includes the theory of laser diodes, device list, workplace layout, description of measurment methods, followed by measuring and and processing the values in program with graphical output. Resulting values are compared with catalog data.
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Ionic fields of various kinds and method of measurement.
Gubani, Ondřej ; Vaněk, Jiří (referee) ; Vognar, Jiří (advisor)
In the air there are positively and negatively charged ions with different mobility and size. The therapeutic effect of negative ions with high mobility is known. High concentration of negative ions occurs in speleotherapic caves. This bachelor thesis introduces the methods of measuring the concentration and mobility of various kinds of ions and their evaluation by spectral characteristics. It verifies the current mirror effect on the ions´ concentration in space. It also examines the effect of different types of ions in living organisms and an appropriate area treatment for the occurrence of negative ions.
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