DEVICE AND METHOD FOR TESTING THE FUNCTION OF AN ANTENNA SYSTEM FOR FOREIGN METAL DETECTION
The invention relates to a device for testing the function of an antenna system, in particular fr foreign metal detection, comprising an antenna system having a plurality of antennas (A0,..., A31) which are connected to an associated input of a selection unit (SE). The antennas (A0,..., A15) of a first antenna group of the plurality of antennas (A0,..., A31) are connected to the inputs of a first multiplexer (MUXa) of the selection unit (SE). The antennas (A16,..., A31) of a second antenna group of the plurality of antennas (A0,..., A31) are connected to the inputs of a second multiplexer (MUXb) of the selection unit (SE). The antennas (A0,..., A15) of the first antenna group and the antennas (A16,..., A31) of the second antenna group are arranged next to one another and/or overlapping in pairs. A computing unit (CU) is designed to feed in an AC signal into a selected antenna (A0,..., A15) of the first antenna group by providing control signals (CTRL_MUX_I, CTRL_MUX_II, CTRL_MUX_III, CTRL_DIAG) for the selection unit (SE), and to detect the antenna signal present at every antenna (A16,..., A31) of the second antenna group at an output (SEO) of the selection unit (SE) for the selected antenna (A0,..., A15) and store same for a subsequent evaluation. From the comparison of the determined antenna signals for the selected antenna (A0,..., A15) of the first antenna system and associated expected antenna signals, an error in the selected antenna/antenna system can be inferred.