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Wideband low-profile circularly polarized antenna array
Benites Ayala, Jhony Cristian ; Cupal, Miroslav (referee) ; Raida, Zbyněk (advisor)
This bachelor’s thesis is focused on the study of a novel type of wideband low-profile circular array antenna with circular polarization and high gain. The aim of this thesis is to design, optimize and implement the proposed antenna for a 5.5 - 7 GHz frequency band. The thesis deals with theoretical fundamentals in order to subsequently present the concept of the antenna. Furthermore, it describes its design and implementation stages. The antenna was designed in the full-wave program CST Microwave Studio and fabricated on dielectric substrate. Both simulated and measured property results are evaluated in the conclusion.
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Loop antennas for medical applications
Zejda, Luboš ; Puskely, Jan (referee) ; Raida, Zbyněk (advisor)
This thesis is focused on the design of loop antennas for medical applications. The main goal of this thesis is to verify the functionality of published designs of broadband loop antennas, and to compare them with each other. Compared antennas are modified for available substrate and a specified frequency. Antenna with best parameters is selected, manufactured and its characteristics are compared with simulations. Design and simulation software used is CST Microwave Studio.
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Wideband antenna for the frequency range from 5 GHz to 10 GHz
Hebelka, Vladimír ; Oliva, Lukáš (referee) ; Řezníček, Zdeněk (advisor)
The design and manufacturing of a wideband bow-tie antennas for the frequency range from 5GHz to 10GHz are described on this thesis. In the first part of this thesis is decsribe a several type of bow-tie antennas. Next part provides the design of bow-tie antennas and optimalization in CST microwave studio software. At the end of the thesis are compare simulation results and measured results of bow-tie antennas.
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Special reflectors for wideband dipole antennas
Velička, Pavel ; Goňa, Stanislav (referee) ; Raida, Zbyněk (advisor)
The thesis is focused on special corrugated reflectors for ultra-wideband antennas. Corrugated reflectors are divided into a type H and a type E. Both these types are mutually combined. All those reflectors are simulated and subsequently analyzed. The thesis also deals with different types of broadband dipoles, which are completed by investigated types of reflectors. Created reflector antennas are then compared. For antennas exhibiting the best parameters, we performed simulations of the transmission between two antennas. For the simulations, we used CST Microwave Studio. Selected antennas were manufactured and measured. Consequent simulations were aimed to detect differences between the simulated and measured results.
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Design of log-periodic antenna
Kliha, Marek ; Nováček, Zdeněk (referee) ; Láčík, Jaroslav (advisor)
This diploma thesis deal with the design of log-periodic antenna. The log-periodic antenna is self-complementary and broadband antenna. Antenna self-complementary structures are described only by angles. Input impedance of log-periodic antenna is equal to theoretical impedance ohms. The input impedance and radiation patterns of broadband antenna structures are independent of frequency over theoretically unlimited bandwidths. The log-periodic antennas provide linearly polarized radiation pattern. In this thesis is designed antenna for bandwidths 1 to 5GHz. In this diploma thesis is introduced design balanced unit, this is compound broadband balun and broadband impedance transformer. The broadband balun is based on conversion of microstrip line to balanced stripline. The Klopfenstein impedance taper is used for design. For simulation was used software from firma Zeland software IE3D.
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