Patent ID: 8350752

Claim:
A radar level gauge system, for determining a filling level of a product contained in a tank, said radar level gauge system comprising: a transceiver for generating, transmitting and receiving electromagnetic signals; a propagating device electrically connected to said transceiver and arranged to propagate a transmitted electromagnetic signal towards a surface of the product contained in the tank, and to return echo signals resulting from reflections at impedance transitions encountered by the transmitted electromagnetic signal, including a surface echo signal resulting from reflection at said surface, back to said transceiver; processing circuitry connected to said transceiver and configured to determine said filling level based on said surface echo signal; and a bottom reflector arranged at a bottom of said tank, the bottom reflector comprising a plurality of phase-modifying structures, each being configured to modify a phase of said transmitted electromagnetic signal and to reflect phase-modified electromagnetic signals, wherein the plurality of phase-modifying structures are arranged in such a way that phase-modified electromagnetic signals being reflected by different phase-modifying structures have different phases such as to interact to provide destructive interference towards said propagating device.