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Design of the device for magnetodynamic characterization of magnetic materials and nanostructures
Roučka, Václav ; Vaňatka, Marek (referee) ; Turčan, Igor (advisor)
Further development of magnonics, the field of study dealing with the phenomenon of spin waves, is connected to the research of novel materials and structures with useful magnetodynamic properties. One of the possible experimental techniques used to quantify these properties is the measurement of ferromagnetic resonance using vector network analyzer. This experimental technique is being dealt with in the presented bachelor thesis. At the beginning we shortly introduce the theoretical foundations of magnetization dynamics and the propagation of electromagnetic waves in microwave circuits. Then we describe the individual devices of the experimental apparatus and its overall design. Function of the device is demonstrated on a measurement of ferromagnetic resonance of a permalloy sample. Acquired data is processed using the methods mentioned in this thesis and at the end we present the resulting magnetodynamic properties of permalloy.
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Circuit Parameters Measurement by S parameters - Laboratory Experiment
Karniš, David ; Láčík, Jaroslav (referee) ; Urbanec, Tomáš (advisor)
Bachelor thesis describes a method of measuring impedance suitable for determining the properties of RF and microwave circuits. The main objective is to get acquainted with S parameters, method of measuring them with vector analysis and with equivalent circuits of passive elements. Further is discussed the issue of calibration and its parts. The following section describes the product design process, concluded by verification of measuring method and design.
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Circuit Parameters Measurement by S parameters - Laboratory Experiment
Karniš, David ; Láčík, Jaroslav (referee) ; Urbanec, Tomáš (advisor)
Bachelor thesis describes a method of measuring impedance suitable for determining the properties of RF and microwave circuits. The main objective is to get acquainted with S parameters, method of measuring them with vector analysis and with equivalent circuits of passive elements. Further is discussed the issue of calibration and its parts. The following section describes the product design process, concluded by verification of measuring method and design.
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Selective Circuits - Laboratory Experiment
Košťál, Stanislav ; Vágner, Petr (referee) ; Urbanec, Tomáš (advisor)
The aim of this thesis is to describe the distribution and behavior of selective circuits and methods for their implementation. There are formulas provided for the calculation of the frequency components of selected second-order RLC filters. It further describes the choice of filter frequency components and computing relationships needed for the construction of coils. The work also includes a description and complete information needed for making measurements of the measurement of the RLC band-pass. The annex to this work includes all the materials needed for implementation of laboratory tasks designed to measure using the product.
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Special Methods for Microwave Vector Measurements
Urbanec, Tomáš ; Svačina, Jiří (advisor)
Theoretical principles of the sixport measurement method are presented. Description of theoretical design and influence of its parameters on measurement precision follows. Simple sixport measurement system was made and its parameters are described. As the main thesis contribution there is described a new approach to method with more detectors in the system. Mean features are more valid sixports at one specific frequency and frequency bandwidth aviable up to 1 : 100 and more. Such a wideband measurement system was designed for the frequencies between 50 and 2680 MHz and its parameters are presented in the work.
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Basic measurement on the Vector network analyzer
Lapčík, Josef ; Urbanec, Tomáš (referee) ; Dřínovský, Jiří (advisor)
This bachelor project concerns with a vector network analyzer for measurement of reflection coefficient, carry coefficient and scattering coefficients. Main parts of vector network analyzer and principle of analyzer with relation to possible areas of error correction are described. Possibilities of using modern vector network analyzer are shown in relation to their conception. Second part of the project deals with design of filters and directional coupler designed for measuring on analyzer. Designs of lowpass filter, bandpass filter and branch-line directional coupler are describe in details. Results of filters analysis from program Ansoft Designer and results of measurement on vector network analyzer are appended. The last part of project focus on creation of application for automatic measurement on network analyzer in program interface Agilent VEE.
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Permittivity measurement of materials by coax probe
Ryba, Ivan ; Oppl, Ladislav (referee) ; Láčík, Jaroslav (advisor)
This thesis describes possibilities of measuring permittivity of various materials, especially with coaxial probe method. It describes character of measuring method, hardware requirements and how to calculate values from the measured. Objective of this thesis is to design measuring station for measuring permittivity of materials with coaxial probe including calibration set. Code in Matlab is also programmed and whole station is tested with known samples to discuss measurement accuracy.
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