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Linearly polarized slot antenna in proximity of human body
Hermány, Roman ; Láčík, Jaroslav (referee) ; Hubka, Patrik (advisor)
In this bacherol thesis, a linearly polarized slot antenna in proximity of human body is proposed. The core of the work is a theme of U-type slot antenna, which is created on the half-mode substrate integrated waveguide. This structure is designed at the 5.8 GHz Wi-Fi band. Simulation and measurement prove that the proposed antenna radiates electromagnetic wave perpendicular to the antenna plane with linear horizontal polarization. Simulated and measured gain of the antenna is 6.51 and 6.52 dBi, respectively. Simulated and measured impedance bandwidth of the proposed antenna is 1.9 %. The minimum of measured reflection coefficient is slightly shifted by10 MHz to the lower frequencies due to the manufacture tolerance. The antenna placed in proximity of the phantom of the human body achieves very good radiation performance.
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Half-mode SIW filter.
Jackovič, Petr ; Láčík, Jaroslav (referee) ; Hubka, Patrik (advisor)
This bachelor’s thesis presents the design of a half mode substrate integrated waveguide band-pass filter by quarter wavelength resonators. This filter is design symestric with quarter resonators are coupled by impedance and admittance inverters. Simulated results shows the HMSIW filter is good performance of low insertion loss, hight quality factor and compact size. In numerical model is good agreement of bandwidth and transmission between simulation and measurement.
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HMSIW linearly polarized slot antenna array
Horák, Lukáš ; Pítra, Kamil (referee) ; Hubka, Patrik (advisor)
In this work is proposed a HMSIW linearly polarized slot antenna arrays. The first antenna array is composed of four U-shape slots and the second antenna array is composed of four U-shape slots with three patches placed near the magnetic wall of HMSIW. The patches improve radiating parametrs of the proposed antenna array. The proposed antenna arrays are manufactured a measured.
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Digitally controlled multifunction filter
Hubka, Patrik ; Kubíček, Michal (referee) ; Ševčík, Břetislav (advisor)
he bachelor thesis deals with the modern design of analog filter where the digital potentiometers to control circuit parameters are used. The main purpose of this thesis is to create a fully digitally controlled filter at frequencies above 1 MHz based on LT1568 integrated circuit. The main circuit parameters such as cut-off frequency, gain, filter order and type of approximation function are digitally controlled. Analysis of parasitic effects of digital potentiometers is included. The integrated circuit functionallity is demonstrated by LTspice circuit simulator. Finally, the experimental measurement results for various circuit parameters setting are included.
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Rectangular patch atenna for the frequency band 60 GHz
Hubka, Patrik ; Hertl, Ivo (referee) ; Hebelka, Vladimír (advisor)
The goal of this thesis is design and build rectangular patch antenna for 60 GHz band, matched to 50 Ohms. First section described general knowledges about microstrips antennas and technologies for 60 GHz band. Second section introduced rectangular patch antenna feeded by miscrostrip line matched by quarter wave transformer on CuClad 217 substrate. Third section introduced two structural modification of rectangular patch antenna and measurements of return loss |S11|.
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