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Design of 436.5 MHz Square Patch Antenna Fed by Coaxial Probe
Lukáč, Vladimír ; Urbanec, Tomáš
This letter describes the design of a square patch antenna used for reception of satellite signals in the UHF band. This antenna is fed by coaxial probe with extended ground plane. Used dielectric substrate is Ertalon 6 SA with height of 15 mm. The designed antenna is simulated in the HFSS Ansys program. The simulation takes into account the maximum gain, the reflection coefficient and the bandwidth of the antenna.
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Compact Antenna System for Satellite Signals Reception in UHF Band
Lukáč, Vladimír ; Pítra, Kamil (referee) ; Urbanec, Tomáš (advisor)
Táto práca popisuje návrh anténnej rady pre príjem družicových signálov v UHF pásmu. V práci sú uvedné metódy získania informácií o družici a ich štatistikcé vyhodnotenie. Na základe získaných informácií sa navrhne vybraná antenna. Navrnutá jednoprvková anténa je simulovaná v programu HFSS Ansys. V simulácií sa berie ohľad na maximálny zisk, činiteľ odrazu a šírka pásma antény. Základný model a výsledky sú potom použité pre tvorbu anténneho poľa. Rovnakým spôsobom, anténne pole je testované v simulátoru ako jednoprvková antenna. Na základe simulácií, jednoprvková anténa je fyzicky vyrobené a odmerané. Získané výsledky z jednoprvkovej antény poslúžia ako základ pri vytváraní anténneho poľa.
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Web application for antenna analysis
Večeřa, Štěpán ; Kadlec, Petr (referee) ; Raida, Zbyněk (advisor)
Měla být vyvinuta webová aplikace pro zjednodušenou analýzu anténních polí. sestávající z drátových dipólů nebo náplasťových prvků. Původně se předpokládalo, že výpočetní jádro bude vyvinuto v prostředí MATLAB a webové rozhraní v jazyce Python. Studie proveditelnosti ukázala, že plné v jazyce Python je výhodné. Vyvinuté funkce Pythonu pro analýzu a syntézu antén jsou stručně popsány a jejich funkčnost je ověřena v prostředí MATLAB.
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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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Computing directivity patterns in Comsol Multiphysics
Ryšánek, Martin ; Lukeš, Zbyněk (referee) ; Raida, Zbyněk (advisor)
The individual project – Computing directivity patterns in Comsol Multiphysics. In the first part, the theoretical background for monopole antennas is reviewed. The second part is focused on the analysis of several types of monopoles in COMSOL Multiphysics, and on the calculation of their radiation patterns and impedances. Finally, simulation results are presented and discussed.
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Improving antenna parameters by the application of metamaterials
Šporik, Vladimír ; Hertl, Ivo (referee) ; Raida, Zbyněk (advisor)
The thesis is focused on the design of a planar resonant-type antenna, which exploits a proper combination of left- and right-handed properties of transmission lines. This transmission line is called CRLH TL and is based on Sievenpiper mushroom structure. Advantages of the proposed antenna concept are demonstrated by a detailed comparison of its basic properties with the properties of a conventional patch antenna.
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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
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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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Current distribution on linear antennas
Dvořák, Zdeněk ; Puskely, Jan (referee) ; Nováček, Zdeněk (advisor)
Bachelor’s thesis of Current distribution on linear antennas is concerned about possibilities of measuring current distribution on antenna. There is also close peak on measuring principles with help of measuring loop. Current in the loop is inducted in continual proportion to magnetic induction, which is inducted by the current distributed on antenna conductor in proximity of measuring loop. There are also described important parameters of antenna, which can be got from current distribution. This thesis discusses about the method of measure with the sonde in more detail. The expanded program DISTRIB helps to process measured values. This program is modified specially for short and long antennas. There is enclosed the projected submission of laboratory exercise, an exemplary protocol and sinusoidal regression calculation, which is used by the computer program.
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