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Multilayer textile antenna array
Hermány, Roman ; Tobola, Pavel (referee) ; Raida, Zbyněk (advisor)
Thesis focuses on the design and development of three possible methods to power the serial patch array and optimization of the chosen design. The antenna array is conceived as a multi-layered structure formed on a 3D textile substrate. The objective of this work is to identify the best possible configuration of antenna array for the use in automotive and aerospace industry. The first concept – array coupled by near microstrip line – proved in the case of the more serial elements as non-functional. The second concept – aperture coupled array – is unsuitable for use in close proximity to the electrically conductive shell of the aircraft. The third concept – array coupled with textile integrated waveguide – seems like the best possible solution. The design of the array coupled with textile integrated waveguide was optimized in consideration of the production process. The impedance bandwidth of this proposed three elements antenna is 890 MHz, the gain in the main lobe direction is 11.8 dBi.
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Antennas from non-conventional materials
Sedlák, David ; Baumgartnerová, Alena (referee) ; Langerová, Petra (advisor)
Výroba antén z alternativních a netradičních materiálů je velmi zajímavý elektrotechnický obor, ve ktrých pracuje spousta velkých firem. Zejmána pak firmy zabývající se mobilní elektronikou. Vývoj v tomto oboru probíhá neustále. Všechnz výrobní postupy a procesz popsané v této bakalářské práci jsou ověřené a funkční. Berte však na vědomí, že existuje spousta jiných a odlišných postupů výroby nositelných antén, které nejsou obsahem této práce. tato bakalářská práce se yabývá yejména: tzpz antén pro mobilní elektroniku, drátovými anténami, štěrbinovými anténami, elektricky vodivou povrchovou úpravou, sítotiskem, inkoustovým tiskem, implementací vodivých vláken do textilu, tisknutelnou anténou na sklo a praktickou výrobou flíčkové antény z 3D textilu.
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Harvesting of emelctromagnetic energy in 24 GHz band
Rokos, Lukáš ; Pokorný, Michal (referee) ; Raida, Zbyněk (advisor)
The thesis describes basic principles of an electromagnetic energy harvesting and its potential use. To gain the energy, a rectenna (rectifying antenna) is selected. The rectenna consists of a patch antenna, a matching circuit and a rectifier circuit. The thesis describes a design of the patch antenna operating at 24 GHz and its matching to the microstrip line with the characteristic impedance 50 . Then, the circuit for matching the rectified is designed using an open-ended stub. The last part of the thesis describes several types of rectifier circuits to be used potentially. Functionality of the designed rectenna has been verified in ANSYS Designer.
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Broadband linear antenna array for BAN applications
Gaja, Tomáš ; Kufa, Martin (referee) ; Puskely, Jan (advisor)
The work deals with the design and the practical realization of a single element of antenna arrays and with the simulation of all elements of antenna arrays for application in BAN. The main attention is focused on the shaping of radiation pattern with suppression of unwanted side lobes. Based on these principles the script was created in MATLAB environment which effectively analyses features of each desired antenna array. The next section of this work is focused on design of narrowband Patch antenna and broadband Vivaldi antenna in frequency band ISM 5.8 GHz and supply network for antenna arrays. Designed antenna arrays were verified in simulator of electromagnetic field CST including their function and features in proximity of human tissue. These simulations were experimentally made only for a single element of antenna arrays. The results from measured radiation pattern were analyzed in script as array about eight elements.
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Computer modeling of implantable antennas
Deneš, Roman ; Kadlec, Petr (referee) ; Raida, Zbyněk (advisor)
The thesis deals with a design of planar antennas and their simulation in the vicinity of a human body. The main goal of this thesis is parametrically analyse different types of planar antennas and find out which one possesses the highest quality in the vicinity of a human body. The design and simulation were made in a software called CST Microwave Studio. Firstly, the attention is paid to the concept of designing and simulation. Further, they are made and tested.
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Multiband Patch Antenna
Šebesta, Jiří ; Puskely, Jan (referee) ; Všetula, Petr (advisor)
Semestral thesis deals with design, numerical modeling and optimalization of lineary polarized patch antennas in program CST Microwave studio. In this thesis, various types of feeding methods and various methods for achieving multiband behaviour of patch antennas are compared.
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Energy harvesting demonstrator
Kaděra, Petr ; Mikulášek, Tomáš (referee) ; Mrnka, Michal (advisor)
This semestral thesis is focused on radio frequency energy harvesting. The thesis describe parts of network that are essential for conversion of radio frequency energy into DC. It deals with various solutions to the given problem. The aim of the thesis is to design a proper antenna with supplemental circuits for commercial Powercast P2110B receiver which combines the function of a rectifier and a step-up DC/DC converter.
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Modeling of planar antenna loaded with ring resonators
Šrajbr, Michal ; Kovács, Peter (referee) ; Láčík, Jaroslav (advisor)
This bachelor’s thesis is focused on the design of the dual-band printed dipol loaded with split ring resonators. The principal of this antenna is described in the first part. The main focus is on the design and tuning of the split ring resonators on the required working frequency in the CST Microwave Studio program. These results are used for designing dual-band printed dipol loaded with split ring resonators working at resonance frequencies of 1,8 a 2,4 GHz. The simulation of this antenna was performed in the IE3D program Zeland. The designed dual-frequency printed dipole has been manufactured and measured.
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Modeling and optimization of patch antennas
Šídlová, Ludmila ; Láčík, Jaroslav (referee) ; Raida, Zbyněk (advisor)
This work is engaged in modeling of patch antennas. It describes various types of synthesizing the layout and designing the microstrip feeder or probe feeding. This work is focusing on modeling and creating a patch antenna for 6 GHz fabricated from ARLON 25N and fed by a microstrip. The layout is first calculated from required antenna parameters and substrate parameters. The optimization of the patch antenna is carried out in the program ANSOFT Designer, which analyzes planar structures by the moment method. The fabricated patch antenna is measured by a vector analyzer. Results of measurements and computations are compared in terms of frequency response of the standing wave ratio for the frequency interval from 5.5 to 6.5 GHz. The patch antenna is also modeled in the program COMSOL Multiphysics as a two-dimensional conical monopole with a coaxial feeding, and a three-dimensional patch fed by a microstrip; the design is optimized for the operation frequency 6 GHz.
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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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