Radar sensor for distance determination

A radar sensor for determining a distance of an object in a detection area, the radar sensor comprising:

• a transmitter module which comprises a transmitter-side patch array antenna having a first directivity, the transmitter module being configured to transmit radar signals with the first directivity;
• a receiver module which comprises a receiver-side patch array antenna having a first directivity, the receiver module being configured to receive the radar signals which are reflected in the detection area;
• and
• a lens device arranged in a beam path of the transmitted radar signals and of the reflected radar signals opposite to the transmitter module and to the receiver module, the lens device comprising a first lens for the transmitted radar signals and a second lens for the reflected radar signals,
• wherein,
• the transmitter-side patch array antenna and the receiver-side patch array antenna are each configured so that the respective first directivity comprises, in a sectional plane running vertical with respect to a propagation direction of the transmitted or reflected radar signals, a length extension and a width extension which runs orthogonal to the length extension, the length extension being smaller than the width extension,
• the second lens is arranged substantially directly adjacent to the first lens in a direction of the length extension in a top view, and
• the first lens and the second lens are designed so that a ratio between the length extension and the width extension of the first directivity of the radar signals or a second directivity of the radar signals is influenceable so that the radar signals with the first directivity, and thus with the length extension which is smaller than the width extension, is convertible into radar signals with the second directivity, and thus with a length extension which is larger than a width extension, and/or vice versa.