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Circularly polarized dielectric resonator antenna
Zechmeister, Jaroslav ; Kufa, Martin (referee) ; Mrnka, Michal (advisor)
This thesis discusses the design circularly polarized dielectric resonator antennas for ISM band 5,8 GHz. In this work are explained and compared different ways of resonator feeding. There are also discussed the possibility of generating a circular polarization from a aperture feeding. Two methods of generating circular polarization in dielectric resonator antennas are simulated in CST Microwave Studio. This methods are C-shaped slot and cross slot. For antenna with cross slot feeding is also simulated effect of the manufacturing process to characteristics proposed antenna. The antenna is made, measured and the results are compared with simulations.
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Low-profile magnetic antenna
Buriánek, František ; Všetula, Petr (referee) ; Raida, Zbyněk (advisor)
This bachelor thesis presents design and simulation of low-pro?le magnetic antenna in CST Microwave Studio program. The simulation procedure is described here, including all the settings required for proper operation of the simulation. In the next part the work deals with the selection of the appropriate material for the antenna, its design and methods of manufacturing.
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Dielectric resonator antenna
Štarha, Michal ; Pokorný, Michal (referee) ; Láčík, Jaroslav (advisor)
This project deals with using of dielectric resonators as antennas. There are discussed possibilities feed of these antennas, as feed probe, feed of microstrip line, aperture coupling, or coplanar waveguide. Then there is a simple example design dielectric resonator antenna and its modeling in CST Microwave Studio. The designed antenna is fabricated and measured.
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Patch antenna completed by multiband ground plane
Syrový, Jiří ; Kovács, Peter (referee) ; Láčík, Jaroslav (advisor)
This thesis is aimed on multiband plannar antennas. The features of free stand-alone patch antenna and frequency selective surfaces (FSS) are needed to be investigated. The stand-alone rectangular patch antenna is analyzed in Ansoft Designer. All other results are achieved using CST Microwave studio. The final product is multiband triangle patch antenna with two frequency selective reflectors formed by FSS. The results of particular analysis are compared with theory published in literature.
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Experimental tags for UHF RFID applications
Pacholík, Vladimír ; Holek, Karel (referee) ; Lukeš, Zbyněk (advisor)
This thesis deals with RFID tags design. It comprises an overview of the RDIF technology while focusing upon the passive tags in UHF band. The CST Microwave studio software has been used for draft simulations. The resulting tags have been subjected to parameter measuring – the reflection coefficient, the minimum capacity needed to switch on the tag, the maximum reading distance. The influence of the proximity of metal objects and other materials has also been examined.
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Influence of hazardous EM fields on large objects
Klučka, Jaroslav ; Kovács, Peter (referee) ; Řezníček, Zdeněk (advisor)
This bachelor thesis deals with simulation of influences of electromagnetic field on an aircraft via computer program PAM-CEM. The aim of the simulation is verification of conditions for placing equipment and cables in chosen places. There were chosen two outer interfering electromagnetic fields: High Intensity Radiated Fields HIRF and a lightning bolt. During the simulation of HIRF, the plane was radiated by outer electromagnetic field. The decomposition of inner electromagnetic field was monitored during the exposure. Then, the electrical intensity was measured in three places, where the location of susceptible electronical devices was predicted. During the simulation of lightning bolt only indirect effects were taken into consideration. Current impulse was implemented into the skin of the aircraft and the decomposition of surface current was monitored.
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Computer modeling of a ridge horn antenna
Lacko, Tomáš ; Lukeš, Zbyněk (referee) ; Láčík, Jaroslav (advisor)
This project includes design and simulation of double ridge horn antenna with frequency range from 1,73 GHz to 14,94 GHz. This work is especially target to calculation proportion of horn for requested gain 20 dB and parameters of double ridge horn antenna. The main aim of project is design of antenna with her computer simulation. Antenna is created and simulated by program CST Microwave Studio.
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Design and optimization of the helical antenna
Zelinková, Lenka ; Olivová, Jana (referee) ; Lukeš, Zbyněk (advisor)
The thesis contains the design of helical antennas for the assigned frequencies. The theoretical design is verified by parameter calculators. The design properties were verified in the computer simulator CST Microwave studio where the antennas were optimized to the maximum gain. The antennas intended as parabola feeds are completed with the designs of parabolas and focal distances between the antennas and the parabolas. Impedance matching by a quarter-wave transformer is designed for the antennas.
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Substrate integrated waveguide filter
Vyskočil, Jiří ; Tkadlec, Roman (referee) ; Láčík, Jaroslav (advisor)
In this thesis is discussed a filter design of a band-pass substrate integrated waveguide filter on the frequency of 5 GHz. It also includes design theory, filter synthesis, filter analysis in the program CST Microwave Studio® and the results of measurement on a vector network analyzer. The analysis results are compared with the measured results. Good agreement between simulated and measured results is observed.
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