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Diversity antennas for wireless ranging
Kudrna, Lukáš ; Vrba, David (referee) ; Raida, Zbyněk (advisor)
Bakalářská práce se zabývá návrhem vhodné mikropáskové flíčkové antény na bezdrátové měření vzdálenosti. Nejdříve se práce zabývá rozdíly ve vlastnostech u lineárních flíčkových antén a antén s levotočivou a pravotočivou kruhovou polarizací. Následně jsou navržené antény optimalizovány v návrhovém prostředí Ansys HFSS tak, aby odpovídaly požadavkům pro frekvenční pásmo Bluetooth Low Energy, správnému impedančnímu přizpůsobení a také požadovaným vyzařovacím schopnostem. Po vyhodnocení výsledků je výsledná nejvhodnější anténa vyrobena a jsou shrnuty a srovnány výsledky měření.
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BLE ranging key fob antenna
Daová, Hana ; Olivová, Jana (referee) ; Raida, Zbyněk (advisor)
Tato bakalářská práce sestává z návrhu antény do klíčku auta, jež bude schopna pomocí mikrokontroléru metodou channel sounding měřit vzdálenost mezi autem a jeho klíčkem. Anténa je navržena pro pásmo 2,4 GHz, ve kterém pracuje technologie Bluetooth Low Energy. V projektu je porovnáním několika numerických modelů, vytvořených a simulovaných v programu ANSYS HFSS, rozebrána problematika výběru vhodného typu antény. Na základě získaných poznatků je následně nejvhodnější anténa optimalizována pro použití s čipem NXP KW45 a její optimalizovaná verze je pak realizována za účelem experimentálního ověření funkčnosti.
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Antenna for mobile high power microwave generator
Kračmar, Leoš ; Láčík, Jaroslav (referee) ; Mikulášek, Tomáš (advisor)
The bachelor thesis deals with the design and practical implementation of a magnetron connected to waveguide as an excitation source for a linear slot antenna array. The goal was thorough acquaintance with the issue of partial parts of designs, verification of calculated parameters using software simulations and practical measurements on manufactured parts of the project. In the first part of the work, it theoretically deals with used components, used parameters and by software design of a magnetron to waveguide transition model with practical measurement. The second part of the work contains calculations and simulations of the design of a linear slot antenna array, which continues by series of practical measurements of antenna properties.
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Circularly polarized antenna integrated into 3D knitted fabric
Drápal, Ladislav ; Kadlec, Petr (referee) ; Raida, Zbyněk (advisor)
The thesis deals with the circularly polarized planar antenna with a working frequency of 5.8 GHz, which was published in [1]. For the antenna, a numerical model in ANSYS HFSS was created to verify the correctness of published parameters. The antenna [1] is of a relatively complicated geometry. In order to demonstrate sense of this geometry, a numerical model of a circularly polarized patch antenna with a working frequency of 5.8 GHz [2] was created. Simulated parameters of both the circularly polarized antennas were mutually compared. The antenna [1] was shown to exhibit a better directivity and a higher gain in the main lobe direction. Both the antennas were then optimized for the 2.4 GHz operation band and a textile substrate. Simulations showed that the patch antenna exhibits on a lower frequency and a textile substrate a higher gain and a better directivity. Both the antennas were manufactured by using a copper foil. The circularly polarized planar antenna [1] was additionally manufactured by screen printing to achieve better parameters. Measurement showed that the best parameters reach the patch antenna [2]. Planar antennas [1] in the 2.4 GHz frequency band did not meet the expectations by the size and complexity on the textile substrate.
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S Band Antennas for Cubesat Satellites
Bekeč, Alexander ; Cupal, Miroslav (referee) ; Urbanec, Tomáš (advisor)
This bachelor’s thesis is dedicated to antennas designed for use onboard miniaturized satellites CubeSat. The main goal of the thesis was to examine suitable antennas working in the S-band for use onboard this type of satellites, create their models and simulate them in the software ANSYS HFSS together with the CubeSat frame to find out its impact on the characteristics of antennas. One of these antennas was constructed together with CubeSat frame and measured in the RF anechoic chamber. Besides these, different types of satellite attitude stabilisation were examined, along with their influence on communication with ground station. Minimal half power beamwidths of antennas were analysed for both studied types of single axis stabilisation with consideration of communication with ground station located in the city of Brno.
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Woven antennas
Fikar, Jan ; Pítra, Kamil (referee) ; Raida, Zbyněk (advisor)
The thesis is aimed to design textile antennas that can operate in the ISM band 5.8 GHz. Attention is turned to practical exploitation of these antennas under regular conditions. Variations of the bandwidth of the antenna due to washing and waterproofing will be observed. Finally, the impact of the proximity of living tissue on the parameters of antennas will be studied.
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Implantable circularly polarized antenna
Šebo, Richard ; Koudelka, Vlastimil (referee) ; Raida, Zbyněk (advisor)
Táto práca sa zaoberá novou miniaturizovanou kruhovo polarizovanou mikropáskovou anténou v tvare kruhu, ktorá bola navrhnutá pre Industrial, Scientific, and Medical pásmo (2.4 -- 2.5 GHz). Navhrnutá anténa bola vytvorená v ANSYS HFSS, najprv bola umiestnená do jendnovrstvého modelu ľudskej kože a jej parametre sú porovnané s pôvodným listom. Anténa je potom umiestnená do trojvrstvého modelu ľudského tkaniva a je pozorované ako iné prostredie a rôzna hĺbka implantácie ovplyvňuje jej parametre. Anténa bola optimalizovaná na dostupné substráty, vyrobená a zmeraná. Lineárne polarizovaná prijímacia anténa bola navrhnutá a vyrobená a bol zmeraný prenos medzi ňou a kruhovo polarizovanou anténou pri rôznych vzájomných orientáciach.
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Antenna for mobile high power microwave generator
Kračmar, Leoš ; Láčík, Jaroslav (referee) ; Mikulášek, Tomáš (advisor)
The bachelor thesis deals with the design and practical implementation of a magnetron connected to waveguide as an excitation source for a linear slot antenna array. The goal was thorough acquaintance with the issue of partial parts of designs, verification of calculated parameters using software simulations and practical measurements on manufactured parts of the project. In the first part of the work, it theoretically deals with used components, used parameters and by software design of a magnetron to waveguide transition model with practical measurement. The second part of the work contains calculations and simulations of the design of a linear slot antenna array, which continues by series of practical measurements of antenna properties.
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Circularly polarized antenna integrated into 3D knitted fabric
Drápal, Ladislav ; Kadlec, Petr (referee) ; Raida, Zbyněk (advisor)
The thesis deals with the circularly polarized planar antenna with a working frequency of 5.8 GHz, which was published in [1]. For the antenna, a numerical model in ANSYS HFSS was created to verify the correctness of published parameters. The antenna [1] is of a relatively complicated geometry. In order to demonstrate sense of this geometry, a numerical model of a circularly polarized patch antenna with a working frequency of 5.8 GHz [2] was created. Simulated parameters of both the circularly polarized antennas were mutually compared. The antenna [1] was shown to exhibit a better directivity and a higher gain in the main lobe direction. Both the antennas were then optimized for the 2.4 GHz operation band and a textile substrate. Simulations showed that the patch antenna exhibits on a lower frequency and a textile substrate a higher gain and a better directivity. Both the antennas were manufactured by using a copper foil. The circularly polarized planar antenna [1] was additionally manufactured by screen printing to achieve better parameters. Measurement showed that the best parameters reach the patch antenna [2]. Planar antennas [1] in the 2.4 GHz frequency band did not meet the expectations by the size and complexity on the textile substrate.
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S Band Antennas for Cubesat Satellites
Bekeč, Alexander ; Cupal, Miroslav (referee) ; Urbanec, Tomáš (advisor)
This bachelor’s thesis is dedicated to antennas designed for use onboard miniaturized satellites CubeSat. The main goal of the thesis was to examine suitable antennas working in the S-band for use onboard this type of satellites, create their models and simulate them in the software ANSYS HFSS together with the CubeSat frame to find out its impact on the characteristics of antennas. One of these antennas was constructed together with CubeSat frame and measured in the RF anechoic chamber. Besides these, different types of satellite attitude stabilisation were examined, along with their influence on communication with ground station. Minimal half power beamwidths of antennas were analysed for both studied types of single axis stabilisation with consideration of communication with ground station located in the city of Brno.
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