In a further possible implementation form of the first aspect, the dimensions of the waveguide, in a direction parallel with the connecting surface, increases from a first dimension to a second dimension, the first dimension being measured between the first wall and the second wall adjacent the connecting surface, the second dimension being measured between the first wall and the second surface of the conductive component, at an end of the second surface located farthest away from the connecting surface, facilitating an antenna array which has as small dimensions as possible and hence allows a display having as large dimensions as possible and no, or small, inactive areas.

In a further possible implementation form of the first aspect, the first wall forms at least one conductor element, the conductor element extending adjacent at least one of the first recess, the conductor element being tapered in a direction perpendicular to the connecting surface, allowing the effective size of the first antenna array to increase without affecting the external dimensions of the antenna array negatively. Wide band impedance matching of the first antenna elements is enabled by the tapered shape of the conductor elements.