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Web application for planar filter design
Sýkora, Vlastimil ; Kadlec, Petr (referee) ; Raida, Zbyněk (advisor)
This bachelor thesis deals with the development of web application for the design of planar filters. The application is written in Python. The thesis was aimed to create a script for simplified filter synthesis, based on the type of filter, its order, and chosen approximation. Initially, an equivalent circuit is constructed and a planar implementation for a given microwave substrate is proposes. The first part of the thesis is devoted to the brief theory required for the design of a simple planar circuit. The second part of this thesis deals with the development of the application itself. The function of input and ouput blocks is described here. The second part also includes description of computational scripts, including examples of the source code, for each filter type, where a different design method is used with a brief additional theory. The third part contains the design of four prototype filters of different types, their simulation in Ansys HFSS, and evaluation of obtained results.
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Electronics for Scintillator Detector Readout and Coaxial RF Line for VITO Beamline at ISOLDE Facility at CERN
Havránek, Daniel ; Valúch,, Daniel (referee) ; Král, Jan (advisor)
VITO (Versatile Ion polarisation Technique Online) beamline experiment se zabývá měřením hyperjemných struktur. Pro jejich měření se využívá RF (Radio Frequency) spektroskopie. Pro RF spektroskopii je nutné navrhnout a simulacemi ověřit aparaturu pro vytvoření interakční oblasti RF a atomového/iontového svazku umožňující RF spektroskopii krátce žijících radioaktivních atomových/iontových svazků s nízkou energií. Důraz je kladen na uniformní rozložení RF pole. Kvůli potřebě uniformního rozložení RF pole je návrh zaměřen na přenosové vedení typu stripline a kvůli nízké energii krátce žijících radioaktivních svazků je jako dielektrikum zvoleno vakuum. VITO beamline se rovněž zabývá -NMR (Nuclear Magnetic Resonance). -NMR je vysoce přesná metoda určení magnetických momentů krátkodobě žijících isotopů s využitím částic vyzářených při při rozpadu izotopů. Tato diplomová práce se rovněž zabývá návrhem elektroniky pro nový detektor, který bude využit pro -NMR beamline VITO v ISOLDE (Isotope mass Separator On-Line facility) zařízení v CERNu (Conseil Européen pour la Recherche Nucléaire).
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An EMC Robust Precise Voltage Reference for Automotive Applications
Krolák, David ; Husák, Miroslav (referee) ; Psychalinos, Professor Costas (referee) ; Horský, Pavel (advisor)
Klíčovou součástí moderních integrovaných obvodů je napěťová reference, která funguje jako srdce analogových bloků poskytující stabilní napětí. Tato disertační práce zkoumá pokročilé metody pro snížení citlivosti nízko příkonových referencí na elektromagnetické interference (EMI) pro automobilová prostředí s širokým teplotním rozsahem. Citlivost na EMI je nežádoucí jev, který může způsobit poruchy elektronického systému. Elektromagnetické rušení se může snadno vázat do obvodu prostřednictvím kabelového svazku a desky s plošnými spoji. Práce poskytuje přehled literatury, návrhy výzkumu a výsledky, které se zaměřují na skryté efekty v napěťovém referenčním jádru, jako je vliv parazitní kapacity z kolektorů bipolárních tranzistorů do substrátu integrovaného obvodu a efekty použitého operačního zesilovače. Jsou uvedena a implementována doporučení pro zlepšení EMI odolnosti napěťové reference. Aby se prokázala platnost navrhovaných vylepšení, byly vyrobeny a změřeny testovací čipy s navrženými napěťovými referencemi v různých technologiích.
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Design and Construction of Transmission Line Loudspeaker Cabinet
Dobiášovský, Jiří ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
Thesis is dealing with the topic of design and construction of the transmission line loudspeaker enclosures. Theoretical part is focused on speaker choice, its design elements and their influence on parameters of the speaker. Individual parameters of the speaker, mathematical equations for their determination and choice of suitable speaker for transmission line loudspeaker enclosure is furthermore discussed and defined. Principle of transmission line enclosures is discussed together with its advantages and disadvantages compared to other types of enclosures. The individual design elements and their influence on the resulting characteristics of the enclosure are described. In the practical part, with regard to the facts stated in the theoretical part of the work, a suitable speaker is selected and the subsequent design and construction of a variable transmission line speaker is described. This might serve as a teaching aid in future. Part of the work is also a description of procedures for measuring loudspeakers with multiple speakers or resonators.
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Electronic Representation of Line Reflex
Yousifová, Hanen ; Šátek, Václav (referee) ; Kunovský, Jiří (advisor)
It would be difficult to imagine a world without communication systems . In order to optimise guided communication systems , it is necessary to determine or project power and signal losses in the system, since all systems have such losses . To determine these losses and eventually ensure a maximum output, it is necessary to formulate some kind of equation with which to calculate these losses . A mathematical derivation for the telegraph equation in terms of voltage and current for a section of a transmission line will be investigated .
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Testing of Surge Arresters
Jeřábek, Lukáš ; Paar, Martin (referee) ; Krbal, Michal (advisor)
This bachelor's thesis is devoted to metal oxide surge arresters. After historical and theoretical introduction, which explains their principles and describes their characteristical properties, analysis of the standard IEC 60099-4 and testing according to the standard with focus on the type tests follows. This chapter is also amended with review of the standard's imperfections and with its most probable future development. The work concludes with a market survey, a review of the largest manufacturers and a comparison of their products.
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Model of transmission channel for xDSL systems
Jedlička, Zdeněk ; Číž, Radim (referee) ; Krajsa, Ondřej (advisor)
This bachelor thesis introduces the xDSL systems, shows the distribution of group members to symmetric and asymmetric, and shows the possibility of modeling the transmission channel for xDSL systems. It also gives ways you can get primary and secondary cable parameters and shows the potential of simulation. These parameters are used to calculate the transfer function, embedded input impedance and attenuation using the program, which is an integral part of this work.
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New Resources Connection Analysis to Power System
Galuszka, Jakub ; Ing. Pavel Štěpánek - ČEZ a.s.- EDU (referee) ; Matoušek, Antonín (advisor)
This dissertation deals with the idea of annexing a new nuclear resource in the locality of the Dukovany Nuclear Power Plant and the way of its connection to the power system. The main aim of this dissertation is to design concrete solution of the connection of the new resource to a certain point of the power system and complete this design by means of chosen calculation. According to the task, this dissertation consists of three parts. The first part describes the current engineering solution of the main one line diagram of our two existing nuclear power plants and generally of chosen types of power plants abroad, too. There is also a design of the internal consumption of the nuclear power plants. The objective of the second part of this dissertation is to present the survey of the power and dispositional variants of the new resource in view and mainly assess general possibilities of its connection. Using all information from the preceding part, the third part presents the concrete design of the engineering solution of the connection of the new resource to the power system and also the calculation of parameters of block transmission line. Another dissertation named “Study of Slavětice Distribution Substation Enlargement for EDU New Resources“ concurs this part or more precisely, my dissertation as a whole . For my dissertation I have used some materials and information from the ČEZ Corporation which are confidential. I have also used some knowledge from the analysis from the EGÚ Brno Corporation. This dissertation neither represents nor substitutes a complex analysis of all aspects of a new nuclear resource in the Dukovany Nuclear Power Plant.
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The Model of HVDC Line for Laboratory
Mička, Dominik ; Paar, Martin (referee) ; Krbal, Michal (advisor)
The objective of this bachelor thesis is to provide comprehensive information of HDVC transmission and to create laboratory model of HVDC connection. The first part of the thesis presents its pros and cons and provides basic description of individual parts related to the transmission of electrical energy. The thesis also shows proposed design model of HVDC connection, used as a guidance for work in lab environment. Provided are calculated parameters and operational options of working prototype model. Subsequently, the prototype is created and measured test results are compared against calculated and simulated values.
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