National Repository of Grey Literature 61 records found  beginprevious16 - 25nextend  jump to record: Search took 0.00 seconds. 
Dielectric resonator antenna based on substrate integrated waveguide
Kubín, Petr ; Polívka, Milan (referee) ; Mikulášek, Tomáš (advisor)
The Master’s thesis deals with the design of the dielectric resonator antenna array based on the substrate integrated waveguide. The work describes various feed methods of the dielectric resonator antenna and the technique of the design of the antenna. The antenna array was designed in the simulative program ANSYS HFSS at the frequency 10 GHz, subsequently fabricated and measured. The antenna array has the bandwidth of 570 MHz for S11 better than –10 dB and the gain of 12.1 dBi.
Flexible substrate antennas
Sedlák, Jakub ; Puskely, Jan (referee) ; Mikulášek, Tomáš (advisor)
This diploma thesis deals with a design of antennas based on a flexible substrate. There is also a design of a transmission line between a flexible and rigid substrate with FLEX- RIGID technology. In the first part of thesis, there is the technology, advantages and disadvantages of using this technology in design of antennas mentioned. There are also basic antenna parameters mentioned. In second part, the design of a transmission line and four antennas is presented. Two of these antennas are manufactured and measured. Finally, the measured parameters are compared with the simulated results.
Planar and wired Yagi-Uda antennas
Křepela, Pavel ; Pokorný, Michal (referee) ; Mikulášek, Tomáš (advisor)
This work deals with the study of Yagi-Uda antennas, followed by analysis and design of planar antenna with wired reflector. The first part focused on the analysis of the antenna and parameters. Another part of the continuing investigation of the optimum parameters for a given antenna followed by a design in Wi-Fi 5 GHz band. The antenna is simulated in CST Microwave Studio. The final part devoted the results achieved
RFID reader antenna
Trubák, Jan ; Lukeš, Zbyněk (referee) ; Mikulášek, Tomáš (advisor)
This thesis is focused on the design of the antenna to a specific application XY. Emphasis is placed on a narrow antenna beam width, which will ensure full-fledged profit for the tag directly below the antenna. This thesis presents a total of five proposals that could be used by XY application. This thesis also presents the results of field measurements, which confirm the improved characteristics of the antenna with parasitic patch.
Beam steering antenna
Krejčíř, Dominik ; Pokorný, Michal (referee) ; Mikulášek, Tomáš (advisor)
The master s thesis deals with the design of the beamsteering antenna. Methods of the beamsteering and the final antenna design are described. This antenna operates in the ISM band with the central frequency of 5,8 GHz. The antenna is designed in the CST Studio Suite 2020. Butler matrix was designed as a feed network implemented as substrate integrated waveguide. An array of patch antennas was used for radiation.
60GHz omni-directional antenna
Levocký, Kristián ; Pítra, Kamil (referee) ; Mikulášek, Tomáš (advisor)
This thesis deals with brief research on problematics of antennas in microwave band for omni-directional applications, own design and assembling of such an antenna. The purpose of the design is to have a best possible radiation patterns and reflection loss of our antenna. Conical monopole is chosen and it is simulated and changed to get the best possible parameters. Two prototypes are manufactured with mechanical changes applied and their parameters measured. Finished antenna is used for experimental channel measurement.
Double-ridge waveguide horn antenna for EMC measurements
Martincová, Kateřina ; Pokorný, Michal (referee) ; Mikulášek, Tomáš (advisor)
The thesis deals with the design and realization of a horn antenna for electromagnetic compatibility measurement. First it focuses on general theory of antennas, than it focuses more on horn antennas and their design. Second part deals with description of antenna realization and comparison of simulated results.
Planar parabolic reflector antenna
Procházka, Petr ; Pítra, Kamil (referee) ; Mikulášek, Tomáš (advisor)
This master's thesis deals with a design of a planar parabolic reflector antenna. The thesis is divided into several parts. The first section is dedicated to the theory of the parabolic antenna design and a basic introduction of the SIW technology which is used for the realization of an antenna prototype. The second chapter deals with the design of individual parts of the antenna (i. e. a primary and secondary reflector and an antenna feeder excited by a waveguide) for particular assignment. The third part is focused on modeling the designed antenna using ANSYS HFSS. Other parts of the thesis include a conversion of the proposed antenna to the SIW technology and a design of a transition between the antenna and a feeding waveguide WR15. The last part of the thesis deals with measuring of the reflection coefficient and the radiation pattern of the fabricated antenna prototype.
Wideband Flat Antennas for 3D Radar
Füll, David ; Mikulášek, Tomáš (referee) ; Urbanec, Tomáš (advisor)
The theme of this work is the design of flat broadband antennas. Designed antennas were: butterfly antenna, log-periodic antenna, Vivaldi antenna. The design was made in ANSYS HFSS. Models that meet the requirements were made and measured.
Microstrip Patch Antennas Fed by Substrate Integrated Waveguide
Mikulášek, Tomáš ; Polívka,, Milan (referee) ; Vlček, Čestmír (referee) ; Láčík, Jaroslav (advisor)
Dizertační práce je zaměřena na výzkum mikropáskových flíčkových antén a anténních řad napájených vlnovodem integrovaným do substrátu (SIW). Využitím vlnovodu integrovaného do substrátu pro napájení mikropáskové flíčkové antény dochází ke kombinaci výhodných vlastností obou struktur. Výsledkem je kompaktní anténní struktura, jejíž napájecí vedení neprodukuje parazitní záření a neovlivňuje tak vyzařovací charakteristiku antény. Práci lze z věcného hlediska rozdělit do dvou částí. První část práce (kapitola 2) je zaměřena na návrh flíčkových antén a jejich navázání na vlnovod integrovaný do substrátu. První dvě navržené flíčkové antény využívají vlnovod integrovaný do substrátu a štěrbinu nebo koaxiální sondu pro buzení lineárně polarizované vlny. Napájení koaxiální sondou je dále použito pro buzení kruhově polarizované flíčkové antény. Za účelem získání širšího pásma osového poměru je navrženo napájení flíčkové antény ve dvou bodech. Funkčnost všech anténních struktur je popsána pomocí parametrických simulací a ověřena realizací a měřením vyrobených prototypů antén. Prezentované napájecí metody představují nový způsob napájení pro mikropáskové antény využívající technologii SIW. Ve druhé části práce (kapitola 3) je pojednáno o implementaci štěrbinou napájené mikropáskové anténní struktury do malých anténních polí o velikosti 2x2 a 1x4. V případě lineární řady je uvažováno amplitudové rozložení pro optimální potlačení postranních laloků. Obě navržené anténní řady jsou ověřeny měřením a v porovnání s podobnými anténními řadami dostupnými v literatuře dosahují širšího pracovního pásma kmitočtů a vyššího zisku.

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