An antenna device , comprising: an antenna element configured to emit and receive electromagnetic waves, a reflector configured to reflect the electromagnetic waves emitted from the antenna element , a substrate on which the antenna element and the reflector are positioned, wherein the substrate defines a main extension plane extending along a horizontal direction (Y) and a lateral direction (X), wherein the reflector and the antenna element are both positioned on the main extension plane of the substrate , 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 , wherein the reflector is configured for spatially narrowing in the vertical direction (Z) the electromagnetic waves emitted by the antenna element , wherein the reflector has a concave shape in the vertical direction (Z), wherein the concave shape is configured to cause the spatially narrowing, in the vertical direction (Z), of the electromagnetic waves emitted by the antenna element upon reflection at the reflector , wherein the reflector is configured for spatially widening in the horizontal direction (Y) the electromagnetic waves emitted by the antenna element , wherein the reflector has a convex shape in the horizontal direction (Y), preferably an at least partially U-shape in the horizontal direction (Y), and wherein the convex shape is configured to cause the spatially widening, in the horizontal direction (Y), of the electromagnetic waves emitted by the antenna element upon reflection at the reflector . an antenna element configured to emit and receive electromagnetic waves, a reflector configured to reflect the electromagnetic waves emitted from the antenna element , a substrate on which the antenna element and the reflector are positioned, wherein the substrate defines a main extension plane extending along a horizontal direction (Y) and a lateral direction (X), wherein the reflector and the antenna element are both positioned on the main extension plane of the substrate , 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 , wherein the reflector is configured for spatially narrowing in the vertical direction (Z) the electromagnetic waves emitted by the antenna element , wherein the reflector has a concave shape in the vertical direction (Z), wherein the concave shape is configured to cause the spatially narrowing, in the vertical direction (Z), of the electromagnetic waves emitted by the antenna element upon reflection at the reflector , wherein the reflector is configured for spatially widening in the horizontal direction (Y) the electromagnetic waves emitted by the antenna element , wherein the reflector has a convex shape in the horizontal direction (Y), preferably an at least partially U-shape in the horizontal direction (Y), and wherein the convex shape is configured to cause the spatially widening, in the horizontal direction (Y), of the electromagnetic waves emitted by the antenna element upon reflection at the reflector . <EOS>