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Modeling of log-periodic planar antenna
Martiš, Vítězslav ; Pokorný, Michal (referee) ; Láčík, Jaroslav (advisor)
The content of this work is a analysis of the project method and a simulation of planar logarithmically-periodic antenna. The simulation verified effects of main antenna-dimensions on her function. Through the use of results was designed acceptable antenna, inclusive of supply circuit. This was remitted to simulation
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Impedance Transformers with Impedance Ratio 1/50 Ohms for Wide Frequency Range
Zachar, Jiří ; Šebesta, Jiří (referee) ; Dřínovský, Jiří (advisor)
One of the aims of this bachelor’s project was to explore possibilities of the design of impedance transformers for a very wide frequency bandwidth (10 Hz – 100 MHz) with the impedance ratio 1/50 . It is not possible to cover this wide frequency band by one transformer, so the design was split into the design of two impedance transformers. The first transformer was realized on the ferrite coil RIK20. The second transformer was realized by with the components T16-1 and TT25-1-kk+ produced by Mini-CircuitsŽ company, and transform impedance directly in a high frequency range. The performance of realized transformers was approved by measuring transformed impedance on their outputs. The frequency band of transformers was determined from these data. Their insertion loss was also measured. The last part of this work was focused on measuring the insertion loss of EMI filters. The main task was to compare the impedance systems 1 /100 and 0,1 /100 and vice versa. The insertion loss was measured for several chosen EMI filters. The insertion loss of all filters reached approximately the same values for both impedance systems.
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NQR spectroscopy - design of measurement methods
Procházka, Michal ; Bartušek, Karel (referee) ; Steinbauer, Miloslav (advisor)
Nuclear quadropole spectroscopy is a modern analytical method for detecting specific solid state materials, e.g. explosives, drugs etc. It uses phenomenon of atomic nucleus called nuclear quadrupole moment. NQR method is very similar to common nuclear magnetic resonance (NMR) that is why major principles are explained using NMR. The thesis deals with basic principle of NQR, its usage for explosives detection and also detection of other chemical compounds and many other useful applications. The thesis deals with specific circuit design, techniques for sufficient sensitivity, impedance matching and circuit isolation. Practical part consists of simulations as well as designs of a few impedance transformers, pi-networks, and coils. Also experimental probe was created. In the last part, NQR workplace was assembled and a few chemical compounds were detected. These were KClO3, NaClO3 and NaNO2 . Finally minimum detectable amount of potassium chlorate as the strongest signal of these was determined.
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Planar spiral antenna
Zbořil, Vojtěch ; Vašina, Petr (referee) ; Láčík, Jaroslav (advisor)
This thesis deals with the design of a planar spiral antenna. The purpose of the work was to design a suitable planar spiral antenna that would meet the requirements of the assignment. There are two types of these antennas presented in the work, and then there is also a design and model that is created for one of them. The results of model simulations and subsequent optimization are discussed. The characteristic parameters of the antenna and their analysis are investigated. The model is followed-up optimization and the results are discussed. The output of this work should be a designed antenna, which will serve as a component for measuring the characteristic parameters of real antennas.
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Planar spiral antenna
Zbořil, Vojtěch ; Vašina, Petr (referee) ; Láčík, Jaroslav (advisor)
This thesis deals with the design of a planar spiral antenna. The purpose of the work was to design a suitable planar spiral antenna that would meet the requirements of the assignment. There are two types of these antennas presented in the work, and then there is also a design and model that is created for one of them. The results of model simulations and subsequent optimization are discussed. The characteristic parameters of the antenna and their analysis are investigated. The model is followed-up optimization and the results are discussed. The output of this work should be a designed antenna, which will serve as a component for measuring the characteristic parameters of real antennas in the frequency range of 1 GHz to 10 GHz.
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Modeling of log-periodic planar antenna
Martiš, Vítězslav ; Pokorný, Michal (referee) ; Láčík, Jaroslav (advisor)
The content of this work is a analysis of the project method and a simulation of planar logarithmically-periodic antenna. The simulation verified effects of main antenna-dimensions on her function. Through the use of results was designed acceptable antenna, inclusive of supply circuit. This was remitted to simulation
|
|
|
Modeling of log-periodic planar antenna
Martiš, Vítězslav ; Pokorný, Michal (referee) ; Láčík, Jaroslav (advisor)
The content of this work is a analysis of the project method and a simulation of planar logarithmically-periodic antenna. The simulation verified effects of main antenna-dimensions on her function. Through the use of results was designed acceptable antenna, inclusive of supply circuit. This was remitted to simulation
|
|
|
NQR spectroscopy - design of measurement methods
Procházka, Michal ; Bartušek, Karel (referee) ; Steinbauer, Miloslav (advisor)
Nuclear quadropole spectroscopy is a modern analytical method for detecting specific solid state materials, e.g. explosives, drugs etc. It uses phenomenon of atomic nucleus called nuclear quadrupole moment. NQR method is very similar to common nuclear magnetic resonance (NMR) that is why major principles are explained using NMR. The thesis deals with basic principle of NQR, its usage for explosives detection and also detection of other chemical compounds and many other useful applications. The thesis deals with specific circuit design, techniques for sufficient sensitivity, impedance matching and circuit isolation. Practical part consists of simulations as well as designs of a few impedance transformers, pi-networks, and coils. Also experimental probe was created. In the last part, NQR workplace was assembled and a few chemical compounds were detected. These were KClO3, NaClO3 and NaNO2 . Finally minimum detectable amount of potassium chlorate as the strongest signal of these was determined.
|
|
|
Impedance Transformers with Impedance Ratio 1/50 Ohms for Wide Frequency Range
Zachar, Jiří ; Šebesta, Jiří (referee) ; Dřínovský, Jiří (advisor)
One of the aims of this bachelor’s project was to explore possibilities of the design of impedance transformers for a very wide frequency bandwidth (10 Hz – 100 MHz) with the impedance ratio 1/50 . It is not possible to cover this wide frequency band by one transformer, so the design was split into the design of two impedance transformers. The first transformer was realized on the ferrite coil RIK20. The second transformer was realized by with the components T16-1 and TT25-1-kk+ produced by Mini-CircuitsŽ company, and transform impedance directly in a high frequency range. The performance of realized transformers was approved by measuring transformed impedance on their outputs. The frequency band of transformers was determined from these data. Their insertion loss was also measured. The last part of this work was focused on measuring the insertion loss of EMI filters. The main task was to compare the impedance systems 1 /100 and 0,1 /100 and vice versa. The insertion loss was measured for several chosen EMI filters. The insertion loss of all filters reached approximately the same values for both impedance systems.
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