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Load simulator according to ISO 11452 and CISPR25 for a headlamp for EMC testing
Drápal, Ladislav ; Růžek, Václav (referee) ; Kubíček, Michal (advisor)
The diploma thesis with the design of a Load simulator, which will be used during measurements in the EMC chamber. The Load simulator contains a total of five output levels. The diploma thesis solves outputs for directional lights and output for position light. The Load simulator consists of an analog solution of the PWM generator. By assembling a pulse width modulation generator on a solderless field, the basic functionality of the circuit was verified. The measured parameters were compared with the simulated ones. The basic scheme of the PWM generator was expanded with additional components, and an optical control output was created outside the PWM generator. By placing the printed circuit board in an aluminium box, two separate boards were created: one for the power supply and other for the control and performance part. which was not realized yet. The functionality of the circuit was verified by measuring on the PCB, and the waveforms were compared with the implementation on the solderless field. The constructed Load simulator was placed in the EMC chamber, where its resilience was tested through various EMC tests. Finally, the individual results were evaluated, and potential improvements were described.
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Circularly polarized antenna integrated into 3D knitted fabric
Drápal, Ladislav ; Kadlec, Petr (referee) ; Raida, Zbyněk (advisor)
The thesis deals with the circularly polarized planar antenna with a working frequency of 5.8 GHz, which was published in [1]. For the antenna, a numerical model in ANSYS HFSS was created to verify the correctness of published parameters. The antenna [1] is of a relatively complicated geometry. In order to demonstrate sense of this geometry, a numerical model of a circularly polarized patch antenna with a working frequency of 5.8 GHz [2] was created. Simulated parameters of both the circularly polarized antennas were mutually compared. The antenna [1] was shown to exhibit a better directivity and a higher gain in the main lobe direction. Both the antennas were then optimized for the 2.4 GHz operation band and a textile substrate. Simulations showed that the patch antenna exhibits on a lower frequency and a textile substrate a higher gain and a better directivity. Both the antennas were manufactured by using a copper foil. The circularly polarized planar antenna [1] was additionally manufactured by screen printing to achieve better parameters. Measurement showed that the best parameters reach the patch antenna [2]. Planar antennas [1] in the 2.4 GHz frequency band did not meet the expectations by the size and complexity on the textile substrate.
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Circularly polarized antenna integrated into 3D knitted fabric
Drápal, Ladislav ; Kadlec, Petr (referee) ; Raida, Zbyněk (advisor)
The thesis deals with the circularly polarized planar antenna with a working frequency of 5.8 GHz, which was published in [1]. For the antenna, a numerical model in ANSYS HFSS was created to verify the correctness of published parameters. The antenna [1] is of a relatively complicated geometry. In order to demonstrate sense of this geometry, a numerical model of a circularly polarized patch antenna with a working frequency of 5.8 GHz [2] was created. Simulated parameters of both the circularly polarized antennas were mutually compared. The antenna [1] was shown to exhibit a better directivity and a higher gain in the main lobe direction. Both the antennas were then optimized for the 2.4 GHz operation band and a textile substrate. Simulations showed that the patch antenna exhibits on a lower frequency and a textile substrate a higher gain and a better directivity. Both the antennas were manufactured by using a copper foil. The circularly polarized planar antenna [1] was additionally manufactured by screen printing to achieve better parameters. Measurement showed that the best parameters reach the patch antenna [2]. Planar antennas [1] in the 2.4 GHz frequency band did not meet the expectations by the size and complexity on the textile substrate.
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