Antenna polarisation

A method of manufacturing a linear-to-circular polarisation converter, comprising the steps of:

• providing a first element array layer extending in a plane and a second element array layer extending in a plane, each element array layer having a first and second axis parallel to the plane of the respective element array layer, the first axis and second axis being perpendicular axes, wherein one or both of the element array layers exhibit an anisotropic spatial property;
• and
• layering:
• the first element array layer comprising a first array of spaced apart electrically conductive dipole elements;
• the second element array layer comprising a second array of spaced apart electrically conductive dipole elements;
• and
• a dielectric layer extending in a plane separating the first element array layer and the second element array layer,
• wherein:
• the dipole elements of the second element array layer are each located laterally displaced along the first axis with respect to the dipole elements of the first element array layer;
• the dipole elements of the second element array layer are each located laterally aligned along the second axis with respect to the dipole elements of the first element array layer;
• and
• in plan view, a region of one of the dipole elements of the first element array layer overlaps a region of two of the dipole elements of the second element array layer.