Compact dual polarity radiator for a dense array

A printed circuit board, the printed circuit board comprising:

• a dual polarity antenna, the dual polarity antenna comprising:
• a first radiator for radiating or for receiving a first radio-frequency (RF) wave having a first linear polarisation;
• a second radiator for radiating or for receiving a second RF wave having a second linear polarisation orthogonal to the first linear polarisation;
• a first feeding network for exciting the first radiator with a first RF signal;
• and
• a second feeding network for exciting the second radiator with a second RF signal,
• wherein the first radiator comprises one or more electrically conductive parts and the second radiator is provided by one or more slots in the one or more electrically conductive parts, and
• wherein the second feeding network is configured to excite each respective slot of the one or more slots at a central region of the respective slot.