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Periodic structure design for directivity enhancement of dielectric resonator antennas
Slavíček, Radek ; Horák, Jiří (referee) ; Láčík, Jaroslav (advisor)
The thesis deals with linearly polarized dielectric rectangular resonator antenna (DRA) operating in the basic mode TEy11 and higher order mode TEy131 at f0 = 10GHz surrounded by an electromagnetic band gap structure (EBG). The dielectric resonator antennas, the EBG structure were designed and a method of integration of both components was developed. The simulated results show a significant improvement of the radiation pattern in the E-plane radiation pattern (narrower main beam, lower level of side lobes, higher directivity) in comparison to a conventional DRA. This was verified by the TEy11 measurement.
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Project of automatized system for bending parts production
Hirsch, Michal ; Horák, Jaroslav (referee) ; Rumíšek, Pavel (advisor)
The aim of this thesis is to solve the problem from the industry, which consists of the design of workplace for bending parts using industrial robots and manipulators, appreciation and mutual comparison of the proposed alternates of solution of the problem, the choice of most of them, and the subsequent development and economic assessment. An integral part of work is also a brief summary of the issue of technology bending parts, automation and technological design.
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Heating in lossy waveguide
Tichý, Jakub ; Horák, Jiří (referee) ; Raida, Zbyněk (advisor)
This thesis deals with modeling of a waveguide with the rectangular cross-section in Comsol Multiphysics and optimization with PSO algorithm in MATLAB. The practical section describes electromagnetic wave excitation at different frequencies; and the influence of changes of basic characteristics, proportions and the location of an inserted dielectric slide on passing electromagnetic wave in a single-mode band. In next phase of the project, changes of basic characteristics on heating structure at electromagnetic field excitation by this waveguides are discussed. The last part deals with optimizing waveguide filter with particle swarm optimization and research his new electric and thermal character. Modeled phenomena are illustrated by pictures of a waveguide from the axial upper projection, and on rectangular charts.
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Design of manipulation table for workpiece rotating
Horák, Jiří ; Opl, Miroslav (referee) ; Pavlík, Jan (advisor)
This master’s thesis deals with the design of the manipulator for rotating objects, especially workpieces, semifinished products, or complete products around horizontal axis. It’s the manipulator for objects where is needed change orientation during production process. This thesis describes step by step construction of individual components of the manipulator and calculations of propulsive units. At the beginning the conveyor roller with propulsive unit is designed. The next step is construction of scissor lift table and choice of the propulsive unit. There is also made FEM analysis for the scissor mechanism. The next unit is aimed to the construction and computation of rotating and telescopic jaw. Then hydraulic circuit with computation of the propulsive unit is designed. As the final step the appropriate type of sensors are chosen and the step diagram of the manipulator is made. The manipulator is designed in the 3D model program and there are also made some assembly drawings.
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Planar antennas with special superstrates
Zdráhal, Roman ; Oliva, Lukáš (referee) ; Horák, Jiří (advisor)
This diploma thesis deals with the modeling of planar antennas with special superstrates in the CST Microwave Studio. Attention is given to the electromagnetic bandgap (EBG) substrates. Firstly, the working principle of these special substrates and generally physical phenomena accompanying electromagnetic waves propagation in a periodic medium are analyzed. By modeling of basic EBG structures in CST their dispersion diagrams were obtained and afterwards compared to one another. The object of the second part of this thesis was modeling of a chosen antenna in CST. An Antenna placed first on the conventional and then on the EBG substrate - in both cases with special superstrates - is analyzed and compared to each other. In the third part of this thesis, the particle swarm optimization (PSO) technique was implemented in CST (VBA language), and was applied to the original design of the chosen antenna. In the final part of this thesis, the optimized antenna was modeled and analyzed in ANSOFT HFSS, and the results from both simulation programs are compared to each other.
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Processor controlled backup power supply
Hořák, Jan ; Štraus, Pavel (referee) ; Kubíček, Michal (advisor)
This thesis describes the design of a processor controlled small battery backup power supply. The aim is to design a device which can recharge many kinds of mobile devices with a battery capacity up to 2Ah. The main control element is a microprocessor that records operating data of the power supply and stores in onto an SD card. Portability and durability were taken into account during the design. The result is completely designed and build a backup power supply, including program for its microcontroller.
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Optical connection
Horák, Jaroslav ; Mišurec, Jiří (referee) ; Káňa, Ladislav (advisor)
Master's thesis treat of optical connection. The aim of this work was also the practical implementation and successful testing. Communications signal is low frequency in the range of 20 to 15 kHz and intended length of the coupling is approximately 200 m. The first is the work carried out theoretical analysis issues. Then is described the design and implementation of its own facility. In conclusion, the measurement is done and evaluate the parameters. I have dealt the optical connection with using a laser beam that is modulated frequency modulation. This optical signal is converted in the receiver using a PIN photodiode (type PIN) back to the electrical signal. Then there is the demodulation and amplification. The frequency modulator and demodulator is phase lock loop. It realizes the type of circuit CMOS 4046. The work is designed properly functioning equipment. It serves for the transmission of speech and audio signal line. It has good properties that match the criteria. The connection can be used outdoors due to the use of cover. The scope of communication may be even greater than 200 meters
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Measurement of the properties of solid and liquid fuels (biofuels)
Horák, Jakub ; Štelcl, Otakar (referee) ; Moskalík, Jiří (advisor)
Nowadays there are large numbers of standard methods for measuring the properties of fuels. With the increasing number of new methods to an already confusing issue of measurement of fuel becomes even more confusing. This thesis therefore deals with the measurement of the energy properties of solid and liquid fuels (biofuels). The introduction is carried out searches of solid and liquid fuels (biofuels). Search is focused on the description of each type of fuel, their properties and adjustments to the final form suitable for combustion. The next part deals with the sampling of fuel, which divides the sampling and preparation of samples for laboratory testing. The last section describes the methods of measurement of selected energy fuel properties and selects appropriate methods. Methods of measurement of selected properties is then checked in the laboratory.
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Energy audit civic building
Horák, Jakub ; Sýkorová, Iva (referee) ; Horák, Petr (advisor)
The bachelor thesis deals with energy assessment of apartment building by using energy audit. Building is evaluated in terms of energy, economic and environmental. Individual austerity measures are designed and folded to two variants, which are evaluated.
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