Fanny, your thoughts: In a mobile device, the fact that the orientation of the device is unknown, could even be an argument FOR using beamforming. The pattern of the antenna could be varied according to position (assuming we can move the beam to any point in 3 dimensions).
Horn antenas are broadband and directional. they are good for test chamber applications because of their wide bandwidth and strong field in the direction of the DUT. Vivaldi cross polarized antennas are another good alternative.
on a mobile device you may not have enough transmitters to do beamforming but the mobile device can respond to the base station with channel sounding results and the base station would then know how to beamform to that mobile device.
This field is very new to me but my experience with MEMS microphone arrays helps me understand antenna directionality. My experience in aircraft flutter testing helps me understand multi-path and mathematical transforms.
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