Abstract: A device for exchanging data with a transponder. A first antenna surface extends on a broad-side surface of a dielectric body. A reflection surface is provided on the opposite broad-side surface. At the back of the reflection surface there is a feed network for providing a phase-shifted alternating voltage, which is coupled into the antenna surface at a plurality of different feed points by means of feed elements penetrating the reflection surface in an isolated manner. A second antenna surface is spaced apart from the first antenna surface at a distance by means of spacers.