Antenna array comprising horn array elements

An antenna array assembly comprising:

• a plurality of horn array elements, each horn array element comprising a waveguide horn and a plurality of radiator patches;
• a planar substrate to which the plurality of horn array elements is attached, the planar substrate having a ground plane comprising a plurality of slots on a first side, the first side being disposed towards the plurality of horn array elements and comprising a plurality of feed tracks on a second side, each feed track being disposed to cross a respective slot, and each slot corresponding to a respective waveguide horn;
• a ground conductor configured as a reflector, the ground conductor being disposed parallel to the planar substrate and behind the planar substrate with respect to the horn array elements;
• and
• a plurality of conductive members, each conductive member being disposed between the ground conductor and a respective horn array element, each conductive member being perpendicular to the ground conductor, and each conductive member being electrically connected to the ground conductor.