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Beam Shaping Circuits for L Band Antenna
Kalina, Ladislav ; Pítra, Kamil (referee) ; Urbanec, Tomáš (advisor)
This thesis contains design of beamforming network designed for passive radar antennas. The first part contains theory of passive radars and beamforming networks. The next part implies design of beamforming network at the block digram level. Then are choosed circuits for amplitude and phase control, including the design of control communication. It follows by realization of IQ phase shifter and his automatic measurement. Based on this results is phase shifter adjusted and PCB of 2x2 beamforming network is designed. Last part includes design of control application (Matlab) and control program for STM32F407VG microcontroller.
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Analog-digital module for electrical impedance tomography
Zimniok, David ; Mikulka, Jan
The present text introduces the concept of data collecting (voltages and currents) from a phantom connected to electrical impedance tomography. The concept involves a method for signal multiplexing from up to 256 electrodes and the current source for such probes. Considering the high number of electrodes and the estimated extended distances between the probes and the measuring card, the method recommends using probes to convert the measured voltage to a current loop, making them suitable for measuring small voltage levels in the millivolt range.
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Analog-digital module for electrical impedance tomography
Zimniok, David ; Hejtmánek, Tomáš (referee) ; Mikulka, Jan (advisor)
Tato bakalářská práce se zabývá elektrickou impedanční tomografií a jejími problémy. Prvním problémem je měření napětí v širokém rozsahu od milivoltů po desítky voltů. Druhým problémem je měření fáze impedance pomocí mikroprocesoru bez lidské pomoci. Také bylo třeba vyřešit problém s návrhem elektrod a s přenosem malého napětí na velké vzdálenosti mezi měřeným objektem a navrženým zařízením pro zpracování signálů. Ke zpracování signálů a komunikaci byl zvolen mikroprocesor ARM doplněný o zesilovač, který má nastavitelné zesílení a také lineární optočlen pro ochranu mikroprocesoru. Pro zajištění přenosu měřeného napětí na velké vzdálenosti bez ztráty dat je navržena aktivní sonda. Data jsou přenášena prostřednictvím proudové smyčky.
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Beam Shaping Circuits for L Band Antenna
Kalina, Ladislav ; Pítra, Kamil (referee) ; Urbanec, Tomáš (advisor)
This thesis contains design of beamforming network designed for passive radar antennas. The first part contains theory of passive radars and beamforming networks. The next part implies design of beamforming network at the block digram level. Then are choosed circuits for amplitude and phase control, including the design of control communication. It follows by realization of IQ phase shifter and his automatic measurement. Based on this results is phase shifter adjusted and PCB of 2x2 beamforming network is designed. Last part includes design of control application (Matlab) and control program for STM32F407VG microcontroller.
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