High-frequency circuit having crossed lines

A radar sensor, comprising:

• a printed circuit board;
• a plurality of antenna patches situated on the printed circuit board, wherein the antenna patches form a plurality of groups interleaved with one another;
• a feeder circuit for supplying high-frequency signals which differ from one another from group to group, to the antenna patches, wherein the feeder circuit is a high-frequency circuit including:
• the printed circuit board;
• and
• lines crossing each other on the printed circuit board for high-frequency signals, wherein:
• sections of the lines lying on both sides of a crossing point, as well as a coupler forming the crossing point are situated in a common plane on the printed circuit board,
• the sections of the lines are connected to four ports of the coupler situated in a quadrangle, and
• the four ports are connected to one another via a plurality of coupling paths in such a way that components of a signal supplied at a port (a), which propagate on various coupling paths, interfere destructively at adjacent ports (b, d) and constructively at a diagonally opposite port (c).