The tapered sides and the height H of the conductor element 4a, the first surface 3a and the second surface 3b of the conductive component 3 provide waveguide impedance transformation of the first antenna element 8a at sufficient bandwidth.

The second antenna element 9a comprises a second signal feeding connection 14b, at least one conductor 15, and a reflector 16. The second signal feeding connection 14b is connected to the conductor 15, and the reflector 16 is formed by the bottom edge of the first recess 11, i.e. the bottom edge extends in parallel with the connection surface 6 as shown in FIGS. 4b and 5b.

The first recess 11, the second recess 12, and the second surface 3b of the conductive component 3 form a cavity against the second antenna element 9a. The clearance towards the metal surfaces provides sufficient bandwidth of the second antenna element 9a.

In one embodiment, shown in FIGS. 4a and 4b, the second antenna element 9a is a dipole antenna. The dipole antenna comprises two conductors 15 extending in parallel with the reflector 16. The first wall (4) is hidden in FIG. 4a for the sake of clarity.