The invention is directed to a radar antenna array, preferably based on microstrip conductor technology, particularly for a medium to long range radar sensor, comprising at least one first antenna group having a plurality of individual, mutually coupled antenna elements and at least one second antenna group having a plurality of individual, mutually coupled antenna elements, wherein the antenna elements of different antenna groups are not galvanically connected to one another, but are arranged in a common, preferably planar area and in a mutually interlaced manner and can be operated simultaneously.