Patent ID: 8933835
Filing Date: 2015-01-13
Classification: G01F,G01S,H01Q

Abstract:
1. A level gauge for determining a filling level of a product in a tank, said level gauge comprising: a transceiver for transmitting an electromagnetic transmit signal and receiving an electromagnetic echo signal, processing circuitry connected to said transceiver and adapted to determine said filling level based on a relationship between said transmit signal and said echo signal, a two-channel, directional antenna having an antenna aperture adapted to emit electromagnetic energy in a direction of radiation, said directional antenna being connected to said transceiver and arranged to emit said transmit signal into said tank towards a surface of said product, and to receive said echo signal resulting from a reflection of said transmit signal in said product surface, a partition wall dividing said antenna into a first partition for emitting said transmit signal, and a second partition for receiving said echo signal, said partition wall having an outer portion located downstream in said direction of radiation, and an electromagnetic coupling arrangement comprising a first waveguide feeder arranged to couple said transmit signal from said transceiver into said first antenna partition, and a second waveguide feeder arranged to couple said echo signal from said second antenna partition to said transceiver, an electromagnetic de-coupling structure connected to said outer portion of said partition wall, said electromagnetic de-coupling structure arranged to reduce any leakage of electromagnetic energy from said transmit signal into said echo signal.