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Basic measurement on the Vector network analyzer
Lapčík, Josef ; Urbanec, Tomáš (referee) ; Dřínovský, Jiří (advisor)
This bachelor project concerns with a vector network analyzer for measurement of reflection coefficient, carry coefficient and scattering coefficients. Main parts of vector network analyzer and principle of analyzer with relation to possible areas of error correction are described. Possibilities of using modern vector network analyzer are shown in relation to their conception. Second part of the project deals with design of filters and directional coupler designed for measuring on analyzer. Designs of lowpass filter, bandpass filter and branch-line directional coupler are describe in details. Results of filters analysis from program Ansoft Designer and results of measurement on vector network analyzer are appended. The last part of project focus on creation of application for automatic measurement on network analyzer in program interface Agilent VEE.
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FM Transmitter of APRS Telemetry in 144MHz Band
Sabol, Martin ; Špaček, Jiří (referee) ; Urbanec, Tomáš (advisor)
This work deals with analysis of protocol APRS Automatic Positioning System for telemetry. There is analyzed the structure of the most important frames and their application. It discusses the processing of GPS data and subsequent modulation of the selected frequency. This work also describes and discusses the proposed peripheral devices and the used firmware.
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Wideband Vector Measurements
Dvořák, Radek ; Schejbal, Vladimír (referee) ; Dražan, Libor (referee) ; Urbanec, Tomáš (advisor)
Thesis describing design and measurement of the vector reflectometer system based on six port principle. The expectations for precision measurement in wide bandwidth system are explained. Diode linearization problem is described and the calibration method especially designed for the wide band systems is explained. And finally several data processing methods for the final result decision are compared.
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FM Transmitter of APRS Telemetry in 144MHz Band
Bohátka, Jan ; Šádek, Václav (referee) ; Urbanec, Tomáš (advisor)
APRS system is described are sent toin my essay, which is used for sending and receiving text messages. The text messages frequenc 144 MHz by using the modulation scheme AFSK. APRS communicate by using the protocol AX 25, which sends and receives the text messages in the area where are carried despatches and control bits as well. The whole area of high frequency part is in one integrated circuit. The control, coding and decoding of the area is the microcontroller’s job.
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Simple Models of EMI Filters
Kostrhún, Lukáš ; Urbanec, Tomáš (referee) ; Dřínovský, Jiří (advisor)
Thesis goal was principles and method insertion Loss Measurement of EMI Filters study in harmony with the technical standard ČSN CISPR 17, theoretical insertion Loss of Filters deduce in symmetrical and asymmetrical connection of impedance system 50 ohms /50 ohms, 0.1 ohms /100 ohms and 1 ohm /100 ohms, and opposite, and with measure values of Filters compare.
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Miniaturized Measurement System for Wind Speed Estimation.
Štěpánek, Michal ; Vágner, Petr (referee) ; Urbanec, Tomáš (advisor)
This thesis is analysis of thermal anemometer, which contains design and realization. For measuring wind speed there are not used any mechanical moving parts in this way. This measuring uses two thermistors. One of these measures temperature of air, which is very important for compensation of whole system. Temperature of second thermistor is kept on constant value. This value is higher than surrounding air temperature about constant difference. Fluctuant air cools this sensor and because of that systém must supply more of heat. By analysis of value of supplied heat, we can calculate the wind speed value.
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Realisation of microclimate control system for plants
Fikar, Jan ; Šebesta, Jiří (referee) ; Urbanec, Tomáš (advisor)
The aim of my Bachelor thesis was to design an automatic system that would maintain the perfect conditions for growth and development of indoor plants. Plants kept in human households have specific requirements that are often not met. I measured, altered and evaluated several quantities (humidity, temperature, lighting). The whole system is controlled by microcontroller ATmega32.
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Control and Diagnostic System for I2C Bus
Juhás, Miloš ; Šebesta, Jiří (referee) ; Urbanec, Tomáš (advisor)
The objective of this diploma thesis is design and realization of I2C bus analyzer. I2C bus protocol is briefly described, together with means of connecting devices to the bus. Next the basic requirements for I2C bus analyzer are defined. Then the design of hardware I2C-to-USB converter including block description is proposed. The chapter dedicated to converter firmware describes method of communication with PC, decoding of intercepted commands and principles of master, slave and passive mode of bus monitoring. The last part is focused on operation software and its structure. Described are individual interfaces, most notable classes and default plugin modules.
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Subharmonic Mixers for Microwave Bands
Kintr, Jindřich ; Frydrych, Jiří (referee) ; Urbanec, Tomáš (advisor)
The task of this master’s thesis is design and implementation subharmonic mixer for the microwave band. Subharmonic mixer is based on the principle of antiparallel diode. In the first two parts are theoretically described mixers (subharmonic mixer) and topology suitable for implementation. Another work describes the design subharmonic mixer. The proposal is implemented in the program Ansoft designer. DPS is created in Eagle or in Ansoft Designer. The mixers are designed and implemented first on the lower frequency and consequently at higher frequencies (24,048 GHz and 47,088 GHz). Work also includes the measurement results of the mixers.
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