Patent ID: 7701385

Claim:
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, wherein signals of different channels are distinguishable by the radar level gauging system, said system comprising: for each channel, an electronics unit including transceiver circuitry arranged on a printed circuit board for transmitting and receiving said distinguishable signals, and processing circuitry connected to said transceiver circuitry for determining the filling level based on a relation between transmitted signals and received signals; each electronics unit being electronically and galvanically separated from other electronics units; a single antenna for emitting microwave signals transmitted from each transceiver circuitry towards a surface of said product and for receiving echo signals resulting from reflections at impedance transitions encountered by the transmitted microwave signals, including a surface echo signal resulting from reflection at said surface; a single hollow waveguide for guiding microwave signals between each transceiver circuitry and said antenna; and each electronics unit further comprising feeding circuitry arranged on said printed circuit board, said feeding circuitry comprising at least one feeding probe protruding without the means of cables into said single waveguide through a sidewall thereof for feeding said microwave signals into said single waveguide.