Antenna device for emitting and receiving electromagnetic waves

A method for detecting a movement of an object relative to a sensor of a vehicle, the method comprising:

• providing a sensor with an antenna device comprising a substrate on which an antenna element and a reflector are located, wherein the substrate defines a main extension plane extending along a horizontal direction (Y) and a lateral direction (X), wherein a vertical direction (Z) extends perpendicular to the horizontal direction (Y) and the lateral direction (X), and thus perpendicular to the main extension plane of the substrate;
• emitting electromagnetic waves from the antenna element of the sensor;
• reflecting the electromagnetic waves emitted from the antenna element by a concave shape of the reflector in the vertical direction (Z) of the sensor thereby spatially narrowing in the vertical direction (Z) the electromagnetic waves emitted by the antenna element, and by a convex shape of the reflector in the horizontal direction (Y) also spatially widening in the horizontal direction (Y) the electromagnetic waves emitted by the antenna element;
• and
• reflecting electromagnetic waves, which were reflected by the object, at the reflector of the sensor towards the antenna element;
• receiving the electromagnetic waves reflected at the reflector by the antenna element of the sensor;
• and
• detecting, based on the electromagnetic waves received by the antenna element, a movement of the object relative to the sensor of the vehicle.