Radar level gauge system with low reflection spacer arrangement

A radar level gauge system, for determining a filling level of a product in a tank, said radar level gauge system comprising:

• a transceiver for generating, transmitting and receiving electromagnetic signals having a center frequency within a frequency band;
• a multi-conductor probe electrically coupled to said transceiver and arranged and configured to guide an electromagnetic transmit signal from said transceiver towards and into said product in the tank, and to return an electromagnetic surface echo signal resulting from reflection of said transmit signal at a surface of said product back towards said transceiver, said multi-conductor probe comprising a first probe conductor and a second probe conductor extending together from an upper probe end to a lower probe end;
• a plurality of spacer arrangements distributed along the multi-conductor probe for controlling a positional relation between the first probe conductor and the second probe conductor;
• and
• processing circuitry for determining said filling level based on said transmit signal and said surface echo signal,
• wherein each spacer in said plurality of spacers is configured to allow fluid flow along said multi-conductor probe past said spacer, and
• wherein each spacer arrangement in said plurality of spacer arrangements comprises:
• a first spacer member configured to reflect said transmit signal as a first spacer reflection signal having a first amplitude for said center frequency;
• and
• a second spacer member configured to reflect said transmit signal as a second spacer reflection signal having a second amplitude for said center frequency;
• and
• a third spacer member, between said first spacer member and said second spacer member along said multi-conductor probe, the third spacer member being configured to reflect said transmit signal as a third spacer reflection signal having a third amplitude for said center frequency higher than said first amplitude and said second amplitude,
• wherein said first spacer member, said second spacer member, and said third spacer member are arranged along the multi-conductor probe in such a way that the first spacer reflection signal, the second spacer reflection signal, and the third spacer reflection signal interact to provide a combined spacer reflection signal having an amplitude for said center frequency lower than said third amplitude.