The first branch of the conductor 15 is configured as a stripline extending perpendicular to the longitudinal extension L of the groove 7, see FIG. 3a, at the second signal feeding connection 14b. In order to allow the first branch of the conductor 15 to extend in parallel with the reflector 16, the conductor 15 is bent such that it extends parallel with the longitudinal extension L. The second branch of the conductor 15 is shaped symmetrically with the first branch and is connected to the reflector 16 in a tapered transition segment.

In a further embodiment, shown in FIGS. 5a and 5b, the second antenna element 9a is a slot antenna comprising one conductor 15 extending in parallel with the reflector 16, across the first recess 11.

The electronic device 17 may further comprise a third antenna array configured by the metal frame 19a of the housing 19 and a number of connection points 21 arranged between the internal structures of the device and the metal frame 19a. The metal frame 19a is separated from the first wall 4 of the printed circuit board 2 of the beam steering antenna structure 1 by the dielectric material arranged in the dielectric gap 20. The connection points 21 are configured in conductive or capacitive manner across the dielectric gap 20. The third antenna array 21 may be a sub-6 GHz antenna.