Antenna array assembly having high cross polar isolation

An antenna array assembly, comprising:

• a ground plate;
• a linear array of patch radiator elements disposed in a spaced parallel relationship with a first face of the ground plate;
• and
• a first and second elongate passive radiator each comprising a plurality of conductive parts each disposed to be generally upstanding in relation to the first face of the ground plate and being electrically isolated from the ground plate, the first and second elongate passive radiators being disposed symmetrically on either side of the linear array and parallel to a centre line of the linear array, on the same side of the ground plate as the linear array,
• wherein at least some of the conductive parts of a respective elongate passive radiator are disposed in an arrangement having parallel ridges and grooves, in which, in a cross section in a plane parallel to the first face of the ground plate, the ridges extend towards the linear array and the grooves extend away from the linear array, and
• wherein at least some of the conductive parts have a cross-section comprising part of a circle.

An antenna array assembly, comprising:

• a ground plate;
• a linear array of patch radiator elements disposed in a spaced parallel relationship with a first face of the ground plate;
• and
• a first and second elongate passive radiator each comprising a plurality of conductive parts each disposed to be generally upstanding in relation to the first face of the ground plate and being electrically isolated from the ground plate, the first and second elongate passive radiators being disposed symmetrically on either side of the linear array and parallel to a centre line of the linear array, on the same side of the ground plate as the linear array,
• wherein at least some of the conductive parts of a respective elongate passive radiator are disposed in an arrangement having parallel ridges and grooves, in which, in a cross section in a plane parallel to the first face of the ground plate, the ridges extend towards the linear array and the grooves extend away from the linear array, and
• wherein each patch radiator element is configured to radiate at orthogonal polarisations substantially +/−45 degrees to the centre line of the linear array.