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Planar bandpass filter with asymmetric resonators
Cholasta, Lukáš ; Kovács, Peter (referee) ; Raida, Zbyněk (advisor)
In this Bachelor thesis the microstrip bandpass filter with asymmetric resonators is described. In this work, the proposal, simulation, construction and resulting confrontation parameters realized microstrip bandpass filter in programme Ansoft Designer are described. In the introduction the problems analysis micro-wave integrated circuitsis are described, further the proposal of a simulation microstrip bandpass filter in programme Ansoft Designer is solved. In the third part of the bachelor thesis the optimalization of the filter for technology of production and realization of the filter are solved. In the conclusion the results of measurement of the realized filter and comparison with simulation are introduced.
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Low-profile textile antenna with artificial magnetic conductor
Zbořil, Vojtěch ; Cupal, Miroslav (referee) ; Raida, Zbyněk (advisor)
Planar wereable antenna consists of planar wide-band monopole, coplanar waveguide, and artificial magnetic conductor. The goal of this thesis is to verify the legitimacy of their subcomponents by using simulations and comparsions with a paragidmatic publication. The proposed thesis presents analysis of particular components, their partial simulations and comparison with paradigmatic publication. The planar wearable antenna can be used in disciplines such as healtcare, sports, security and rescue services, the military and wherever the position and health of subjects is required to track / monitor.
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Self-adhesive antennas for on-body communication
Punar, Jan ; Fiala, Pavel (referee) ; Raida, Zbyněk (advisor)
This project is focused on planar antennas for on body communication. Project follows the concept of a self-adhesive antenna, which was published in [1]. The included report contains simulation results of the designed antenna, and compares them with results given in [1]. It describes the redesign of the antenna to the operation frequency 5.8 GHz for substrate Arlon 25N followed by subsequent conversion to the thin substrate FR4. The thesis also deals with antennas not only for on body communication but also for communication between the human body and the remote unit. Finally, the work contains measurement results of the reference antenna on the Arlon 25N substrate.
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Circularly polarized antenna array for ISM frequency band 24 GHz
Liyambo, Evans ; Cupal, Miroslav (referee) ; Raida, Zbyněk (advisor)
Tato bakalářská práce se zabývá návrhem a simulací kruhově polarizované anténní řady pro ISM pásmo 24 GHz. Kruhově polarizovaná mikropásková anténa [1] navržená pro práci na kmitočtu 45 GHz byla použita v návrhu anténní řady. Funkce použité antény byla ověřena v programu CST Microwave Studio a její parametry byly porovnány s konvenční flíčkovou anténou buzenou křížovou aperturou. Následně byla anténa modifikována tak, aby pracovala v ISM pásmu 24 GHz.
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Artificial magnetic conductor for textile-integrated circularly polarized antenna
Ritter, John Richard ; Kadlec, Petr (referee) ; Raida, Zbyněk (advisor)
This thesis deals with a circularly polarized antenna using an artificial magnetic conductor (AMC). The concept for this antenna is adopted from [1]. The antenna structure was simulated in its original, published form to verify the validity of the results in [1]. The antenna structure was then modified for manufacturing on a textile substrate and for operation in the ISM 5,8 GHz frequency band. After the modification the antenna was manufactured. The antenna properties were subsequently measured to verify the simulated results. The antenna can be potentially used in wireless communication systems, such as wireless body area networks (WBAN).
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Computer modeling of laser beam
Mittner, Ondřej ; Wilfert, Otakar (referee) ; Raida, Zbyněk (advisor)
This bachelor’s thesis theoretically describes Gaussian beam, its characteristics and its passing through optical elements. The main attention is focused on creating of computer models of Gaussian beam in COMSOL Multiphysics application, detailed description of these models, presentation of achieved results and comparing these results with theoretic presumptions.
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Vertically polarized Yagi antenna with magnetic dipole
Weigel, Filip ; Pokorný, Michal (referee) ; Raida, Zbyněk (advisor)
This bachelor’s thesis deals with the principles of operation and simulation of planar Yagi antennas with a magnetic dipole. Simulation of electromagnetic field was performed in the simulator CST MICROWAVE STUDIO (CST MWS). The project compares results of simulations of several types of Yagi antennas. These antennas can be used for the communication along the living tissue (on-body communication).
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Reconfigurable slot antenna array
Weigel, Filip ; Pítra, Kamil (referee) ; Raida, Zbyněk (advisor)
This master's thesis deals with the basic principles of slot antennas. Models of antennas were simulated in a selected electromagnetic simulator CST MICROWAVE STUDIO (CST MWS). There are several models of slot antennas which are optimized for communication in the car at a frequency 8 GHz.
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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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