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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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Antennas integrated into the window of the car
Bílek, Ondřej ; Puskely, Jan (referee) ; Kufa, Martin (advisor)
The aim of this work is design and implementation of FM and DAB antenna for radio transmitting and antenna for GSM 900, GSM 1800 and 2.4 GHz WiFi which could be implemented into the rear window car. Selected problem is solved by using microstripe antennas placed on a substrate. The antennas were designed by full-wave software CST Microwave Studio 2013.
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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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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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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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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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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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Horn antenna with suppressed side-lobe radiation
Kaděra, Petr ; Puskely, Jan (referee) ; Mikulášek, Tomáš (advisor)
This master´s thesis is focused on the ways of possible realisation of the directive horn antenna with suppressed side lobes in the frequency bands 71-76 GHz and 81-86 GHz. In this thesis a detailed research of the feasible options including parameters comparison and assessment of pros and cons of the particular solutions has been performed. Among the specified technical requirements, the emphasis has been placed on the manufacturing options and low cost availability of the materials applicable for the given antenna. The main part of the thesis deals with the conical horn antenna loaded with a hyperbolic dielectric lens, further the antenna with flat dielectric lens based on a transmitarray and also the integrated elliptical lens antenna. The following part of the thesis deals with the possibilities of characterizing the properties of the dielectric material of the lens.
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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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Flexible substrate antennas
Sedlák, Jakub ; Puskely, Jan (referee) ; Mikulášek, Tomáš (advisor)
This diploma thesis deals with a design of antennas based on a flexible substrate. There is also a design of a transmission line between a flexible and rigid substrate with FLEX- RIGID technology. In the first part of thesis, there is the technology, advantages and disadvantages of using this technology in design of antennas mentioned. There are also basic antenna parameters mentioned. In second part, the design of a transmission line and four antennas is presented. Two of these antennas are manufactured and measured. Finally, the measured parameters are compared with the simulated results.
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