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Temperature and gas leak sensor for caravan
Indrák, Dominik ; Urbanec, Tomáš (referee) ; Frýza, Tomáš (advisor)
This work deal with develop, manufacture and programming of device (choice suitable components, design and manufacture of printed circuit board, write controlling firmware for MCU), which will measure dangerous gases LPG, temperature and humidity in caravans for the company Cutter Systems spol. s.r.o. The radio frequency 863-870 MHz, eventually asynchronous communication UART is used for communication and sending measurement data. In the next section will be describe the develop of the hardware with a device enclosure and firmware writing.
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Frequency multiplier
Šlesingr, Jiří ; Urbanec, Tomáš (referee) ; Dřínovský, Jiří (advisor)
This work is focused on the possibility of realization frequency multipliers and their use in practice. Along with the dividing of multipliers are presented the basic parameters that are important for the choice of acceptable multiplier. From the offer and the available options is then selected for the basic implementation circuit. This is circuit HMC189MS8 manufactured by HITTITE Microwave Corporation. They made two samples with the multiplier circuit. Finally, it describes the design of a diode multiplier. Multipliers are measured and compared their characteristics.
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Advanced microwave filter analyses and design
Čáslavský, Jan ; Urbanec, Tomáš (referee) ; Koudelka, Vlastimil (advisor)
his thesis investigates the design methodology of microstrip filters. The work deals with important steps in microwave filter design. Namely, the selection of approximate function and suitable representation of ideal filter elements are investigated. The basic design approach is demonstrated on the simple examples of microwave filters. These designed filters are analyzed in the program Ansoft Designer.
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Power Amplifier for L Band
Galajda, Jan ; Zatloukal, Petr (referee) ; Urbanec, Tomáš (advisor)
This work is focused on design of L band power amplifier. First, the design of the amplifier is substantiated by necessary theoretical basics of RF power amplifiers. Then, after comparsion of availible RF power amplifiers concepts, the doherty power amplifier is chosen as a suitable type. Design of the amplifier is focused on the linearity and efficiency. AWR design program is used for simulation of the amplifier. Amplifier is then realized and parameters are measured. Measured results are then discussed and evaluated. This work proposes design of the linear doherty amplifier for modern communications systems.
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Special Methods for Microwave Vector Measurements
Urbanec, Tomáš ; Svačina, Jiří (advisor)
Theoretical principles of the sixport measurement method are presented. Description of theoretical design and influence of its parameters on measurement precision follows. Simple sixport measurement system was made and its parameters are described. As the main thesis contribution there is described a new approach to method with more detectors in the system. Mean features are more valid sixports at one specific frequency and frequency bandwidth aviable up to 1 : 100 and more. Such a wideband measurement system was designed for the frequencies between 50 and 2680 MHz and its parameters are presented in the work.
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Adjustable switching power supply
Vyroubal, Rostislav ; Urbanec, Tomáš (referee) ; Baran, Ondřej (advisor)
The aim of this bachelor’s thesis is to create a summary of the convertors, their principles, and to propose the convertor with specific parameters. The printed circuit board is designed for this convertor. Designed convertor is manufactured. Its specific parameters are measured and compared with theoretical parameters. A heatsink is designed for this convertor.
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Beam Shaping Circuits for L Band Antenna
Kalina, Ladislav ; Pítra, Kamil (referee) ; Urbanec, Tomáš (advisor)
This thesis contains design of beamforming network designed for passive radar antennas. The first part contains theory of passive radars and beamforming networks. The next part implies design of beamforming network at the block digram level. Then are choosed circuits for amplitude and phase control, including the design of control communication. It follows by realization of IQ phase shifter and his automatic measurement. Based on this results is phase shifter adjusted and PCB of 2x2 beamforming network is designed. Last part includes design of control application (Matlab) and control program for STM32F407VG microcontroller.
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Controll Module for Circuits with ADF4360 and Selected DDS
Lambor, Jiří ; Vágner, Petr (referee) ; Urbanec, Tomáš (advisor)
This bachelor’s thesis is focused on issues of communication between microprocessor unit and frequency synthesizer circuits - direct digital synthesis circuit (DDS), voltage control oscillator with phase lock loop (ADF). The basic theoretical function of DDS, ADF and SPI interface is described in the introduction. The solution and drafts of modules hardware are shown in next chapter. Last chapter describes programming of DDS and ADF circuits with examples of this code in C language. Schemes and board layouts of modules are attached in appendix.
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