Patent ID: 7099662

Claim:
A level measuring device having a transceiver unit comprising: a transmitter ( 1 ) for generating a signal, an acquisition antenna ( 5 ) for emitting the signal into an acquisition volume ( 8 ) and for picking up an effective echo signal reflected by the acquisition volume ( 8 ), as well as a receiver ( 2 ) for evaluating an echo signal supplied by the acquisition antenna ( 5 ), said signal being composed of the effective echo signal and an unwanted echo signal generated by the acquisition antenna, wherein: an antenna simulation ( 6 ) is connected via one or more couplers ( 3 , 4 , 19 ) to the transmitter ( 1 ) and the receiver ( 2 ), which, upon receiving the signal, provides a correction signal proportional to the unwanted echo signal, and the one or more couplers heterodyne the correction signal and the echo signal whereby the correction signal and the unwanted echo signal cancel out each other.