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Four Channel Active Antenna Switch for UHF Band Satellite Reception
Kubeš, Václav ; Povalač, Aleš (referee) ; Urbanec, Tomáš (advisor)
The goal of this bachelor’s thesis is to design and implement a complex device known as an antenna switch, which allows receiving a high-frequency signal in the UHF band from satellites via one of five directional antennas at a given time. With a suitable choice of antennas, this device is to be an alternative to motorized directional antennas used for satellite signal reception. The device is able to determine the correct antenna switching order using satellite position data. It is also able to filter and amplify the selected high-frequency signal for further transmission via coaxial cable to the receiver. The switch is controlled by an ATmega328PB microcontroller, which ensures the control of the integrated switching element itself, simple current and temperature diagnostics, and bidirectional communication with the control computer using the UART protocol over the LIN bus physical layer. The whole device consists of an external unit, which is to be placed near the antennas and ensures the switching itself, and an internal unit placed inside the building, which ensures the power supply and the distribution of diplexed signals. The user can display diagnostic data and control the external unit using a program with a graphical interface.
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