Rotated ridge waveguide antenna

An antenna arrangement for an array antenna, the antenna arrangement having a stacked layered structure, the antenna arrangement comprising:

• a radiation layer comprising a first slot and a second slot extending along a first slot axis and second slot axis, respectively, where the first and the second slots are arranged in a column extending along a column axis, and where the slot axes are arranged at respective non-zero third and fourth angles with respect to the column axis;
• and
• a distribution layer facing the radiation layer, comprising a first ridge waveguide comprising a first ridge and a second ridge waveguide comprising a second ridge, wherein the first and second waveguides are arranged to distribute a radio frequency signal to the first and second slots, respectively, from a distribution layer feed arranged between the first and second ridges, wherein respective waveguiding paths of the first and second waveguides are configured to match respective shapes of the first and second ridges,
• a first section of the first ridge facing the first slot extends along a first ridge axis and a second section of the second ridge facing the second slot extends along a second ridge axis, where the ridge axes are arranged at respective non-zero first and second angles with respect to the column axis, where the first and second angles are configured to match the third and fourth angles, respectively.