Array of patch antennas

An apparatus comprising:

• a ground plane;
• an array of antennas, wherein the array comprises antennas arranged in parallel rows and parallel columns, wherein each of the antennas in the array of antennas comprises a radiator and feeds for a first polarization and a second polarization orthogonal to the first polarization;
• wherein for one or more columns of the antennas in the array, there is an aligned arrangement of coupling elements comprising coupling elements between the antennas in the respective column,
• wherein the coupling elements are separate from the antennas and are electrically floating,
• wherein the coupling elements are closer to adjacent antennas in a column of the array, in a column direction, for a column towards a center of the array of antennas than for a column towards a periphery of the array of antennas, such that a length of the coupling elements decreases with distance in a first direction from a center of the array of antennas, and a size of a gap in a second direction orthogonal to the first direction increases with distance in the first direction from the center of the array of antennas.