| 摘要 |
A radar level gauging system for determining a filling level of a product contained in a tank by transmitting and receiving microwave signals over at least two functionally independent channels. Each channel has an electronics unit with transceiver circuitry arranged on a printed circuit board and processing circuitry connected to the transceiver circuitry for determining the filling level based on a relation between transmitted signals and received signals, and each electronics unit is electronically and galvanically separated from other electronics units. The system further comprises a single antenna for emitting microwave signals into the tank, and a hollow waveguide for guiding microwave signals between each transceiver circuitry and the antenna. Each electronics unit further comprises feeding circuitry arranged on the printed circuit board, the feeding circuitry comprising at least one feeding probe protruding into the waveguide for feeding the microwave signals into the waveguide. The present invention enables a very simple, cost-effective and reliable feeding for each channel.
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