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3D printed antenna with dielectric lens for free-space material characterization method
Horník, Milan ; Láčík, Jaroslav (referee) ; Kaděra, Petr (advisor)
This bachelor´s thesis deals with the free space setup for material permittivity characterization. The workplace includes two horn antennas, two dielectric lenses and sample holder. The work deals with the characteristic properties of materials such as permittivity and permeability. Further, the methods used to determine permittivity are discussed. The next part of the work is focused on a theoretical analysis of the design of a broadband horn antenna with a dielectric lens. The chapter 3D printing and surface treatment deals with the issue of 3D printing and the possibility of applying a conductive layer on the plastic components. The following section presents the calculated and simulated results performed in CST Microwave Studio. In the next chapter, mechanical construction and measurement setup fabrication are discussed. In the end, the achieved results are evaluated.
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Electrical Properties Analysis Of Epoxy Resins With Various Fillers
Horák, Luděk
Presented thesis is focused on studying electroinsulating epoxy resin-based sealings. It describes a preparation of composite epoxy resin samples with different kinds of micro-ground siliceous sand as a filling. The samples given are measured on the temperature dependency of relative permitivity and dissipation factor.
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Network for high-frequency on-body communication
Halas, David ; Láčík, Jaroslav (referee) ; Kokolia, Martin (advisor)
This work focuses on the design of a network for high-frequency communication on the human body. The thesis is focused on the design of two-band antennas, namely 2.4 GHz and 5.8 GHz. The antenna is integrated into the textile and works close to the human body. The introduction describes the problem of spreading electromagnetic waves along the human body. Further, the thesis deals with the applicability of different types of antennas for integration on the textile substrate. Based on the simulations performed, a suitable antenna is selected for the purpose. The simulation program used is the CST Microwave Studio. In the end, the antennas were optimized, subsequently manufactured and their parameters measured.
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Moisture Effect On Electrical Properties Of
The Composite Epoxy Resins
Horák, Luděk
The thesis presented is focused on studying electroinsulating epoxy resin-based sealings. The aim of the thesis is to compare several sets of samples of composite epoxy resins with different kinds of micro-ground siliceous sand as a filling. The temperature and frequency dependence of relative permittivity and dissipation factor are measured for given samples.
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Relative Permittivity Measurement of 3D-textile
Vélim, Jan
The paper deals with the relative permittivity determination of the 3D-textile by a transmission line method (TLM). Measuring points are shifted to avoid inaccuracies caused by transitions between a coaxial cable and a microstrip line. A substrate where the microstrip line is designed is composed of three layers where one layer (3D-textile) has unknown permittivity. The relative permittivity of the 3D-textile is calculated from effective permittivity by a conformal mapping method.
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Electrical properties analysis of epoxy resins with various fillers
Horák, Luděk ; Kazelle, Jiří (referee) ; Frk, Martin (advisor)
Presented bachelor thesis is focused on studying electroinsulating epoxy resin-based sealings. It describes the chemical composition, production, properties and measuring methods of basic electric quantities of these materials. This work also embodies a preparation of composite epoxy resin samples with different kinds of micro-ground siliceous sand as a filling. The samples given are measured on the temperature dependency of relative permitivity, dissipation factor and inner resistivity.
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