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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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Wideband rectangular patch antenna
Teplý, Tomáš ; Puskely, Jan (referee) ; Láčík, Jaroslav (advisor)
This thesis focuses on the design microstrip antennas with a maximum bandwidth. First discussed are the standard types of supply of these antennas with main attention to the coaxial power supply (power probe) and L-probe. Furthermore, the properties of these types of power examined in the program CST Microwave Studio. The results obtained are used for the design of rectangular Patch Antenna with a maximum bandwidth. The proposed antenna is modeled in CST Microwave Studio program and then implemented. The result of this work is a microstrip antenna, the impedance bandwidth is 32,14%.
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Reconstruction of the Antenna Near-Field
Puskely, Jan ; Mazánek, Miloš (referee) ; Schejbal, Vladimír (referee) ; Nováček, Zdeněk (advisor)
Cílem disertační práce je navrhnout efektivně pracující algoritmus, který na základě bezfázového měření v blízkém poli antény bude schopen zrekonstruovat komplexní blízké pole antény resp. vyzařovací diagram antény ve vzdáleném poli. Na základě těchto úvah byly zkoumány vlastnosti minimalizačního algoritmu. Zejména byl analyzován a vhodně zvolen minimalizační přistup, optimalizační metoda a v neposlední řadě i optimalizační funkce tzv. funkcionál. Dále pro urychlení celého minimalizačního procesu byly uvažovány prvotní odhady. A na závěr byla do minimalizačního algoritmu zahrnuta myšlenka nahrazující hledané elektrické pole několika koeficienty. Na základě předchozích analýz byla navržená bezfázová metoda pro charakterizaci vyzařovacích vlastností antén. Tato metoda kombinuje globální optimalizaci s obrazovou kompresní metodou a s lokální metodou ve spojení s konvečním amplitudovým měřením na dvou površích. V našem případě je globální optimalizace použita k nalezení globálního minima minimalizovaného funkcionálu, kompresní metoda k redukci neznámých proměnných na apertuře antény a lokální metoda zajišťuje přesnější nalezení minima. Navržená metoda je velmi robustní a mnohem rychlejší než jiné dostupné minimalizační algoritmy. Další výzkum byl zaměřen na možnosti využití měřených amplitud pouze z jednoho měřícího povrchu pro rekonstrukci vyzařovacích charakteristik antén a využití nového algoritmu pro rekonstrukci fáze na válcové geometrii.
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Design of optoelectronic positional sensor
Straka, Radomír ; Nováček, Zdeněk (referee) ; Puskely, Jan (advisor)
The aim of this semestral work is design optoelectronic positional sensor, which can measure current position of measuring line. This position has to be measure very precisely. At first the work describes positional sensors used in automatization. Work study parameters of resistance, inductance, capacity, optoelectronic and ultrasound sensors. Subsequently work choose integrated optoelectronic sensor ADNS-5020, realize with ADNS-5020 circuit for measuring position and realize part processing transmission of signal from sensor to PC with integrated circuit FT232RL. The results of this work are design measuring and transfering circuit for optoelectronic positional sensor, measuring program which have control over designed circuit. Measuring program process measured data of voltage possibly current distribution on the line and create tables and graphs with calculation reflection coefficient and impedance from data.
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Technical calculation of linear antenna arrays
Halm, Martin ; Puskely, Jan (referee) ; Pokorný, Michal (advisor)
This project deals with methods of calculation of radiation patterns and input impedances of antenna arrays. The first part describes this issue at a theoretical level. After defining some fundamental parameters of antennas, there is an analysis of finite length dipole. It is followed by the theory of antenna arrays and means of input impedance calculation of antenna array elements. In the final part of the work, a program is designed on the basis of the theory. The program is MATLAB based and implements the above mentioned calculations.
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Design of 3D Vivaldi antenna array for radar applications
Kašpar, Petr ; Pitra,, Kamil (referee) ; Puskely, Jan (advisor)
This master thesis deals with a design of Vivaldi antenna due to its broadband properties suitable for radar applications. The folding of single Vivaldi antenna element into 2D antenna array we achieved required radiation properties. Appropriate design of feeding structure realized by SIW technology we obtained suppression of side lobes and deflection of the main lobe. The work also includes design of 3D Vivaldi antenna array. Modeling, simulation and optimization of antenna array were performed in CST Microwave Studio.
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Design of the antenna unit of access point for off-body communication in the 61 GHz ISM band
Miřácký, Jan ; Pokorný,, Michal (referee) ; Puskely, Jan (advisor)
The Master´s thesis deals with the theoretical design, practical numerical analyses and optimalization of disc-like antenna and disc-like slot antenna. The antennas have relative omnidirectional radiation characteristics in the horizontal plane, respectively in the vertical plane. Antennas exploit the substrate integrated waveguide technology. The antennas themselves are designed for the purpose of making the antenna array that will be work as an antenna unit for access point. The antennas are manufactured and experimentally verified. The program CST Microwave Studio is used for simulation in the thesis.
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Baluns
Beran, Vlastimil ; Puskely, Jan (referee) ; Nováček, Zdeněk (advisor)
The baluns (balanced to unbalanced) circuits are used for connection of symmetrical load (antenna, dipole) to unsymmetrical line (coaxial cable). The balun missing causes the load mismatching to antenna feeder and the antenna parameters degradation as result. There are defined the baluns principle of operation and list of types in this work. The baluns created by short sections lines are the scope of project only. The detailed analysis baluns bandwidth and the type application are described in the second part of project. Several recommendation for baluns design is described as project conclusion including parameters optimalization. The function of the balun was verified by measurement. The relevant results are mentioned in the report end.
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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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Modeling of planar coupling circuits
Valošek, Josef ; Puskely, Jan (referee) ; Láčík, Jaroslav (advisor)
This master’s thesis deals with modelling of the planar coupling circuits, namely type of the wideband couplers and the ultra-wideband couplers. The purpose of this thesis is an analysis, a synthesis, a numerical modelling and a fabrication (only chosen types) of the presented couplers. All of the couplers works on medium frequency f0 = 7 GHz with coupling C = 3 dB. Types of the substrate are Arlon 25N and Arlon AD600. EM simulator IE3D and circuit simulator in program Ansoft Designer are used for the numerical modelling. The realized wideband couplers were measuring by the vector analyzer Agilent E3864B.
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