Multiple-input multiple-output (mimo) antenna

A communication device, comprising:

• a printed circuit board having a plurality of edges, the printed circuit board comprising a ground layer, the ground layer comprising;
• a plurality of antenna element mounting locations, at least one of the plurality of antenna element mounting locations being arranged on a first side of the printed circuit board and at least one of the plurality of antenna element mounting locations being arranged on a second side of the printed circuit board;
• a plurality of slots comprising a dielectric material in a plane of the ground layer, each of the plurality of slots extending a predetermined electrical length from an edge of the printed circuit board;
• and
• at least one ground stub, the at least one ground stub comprising an extension of the ground layer of a predetermined electrical length at a predetermined angle relative to the edge of the printed circuit board;
• a plurality of antenna elements, each of the plurality of antenna elements configured to couple to one of the plurality of antenna element mounting locations;
• a plurality of coupling elements, each coupling element formed from a conductive material, each coupling element having a predetermined electrical length and arranged at an edge of the printed circuit board across from one of the plurality of antenna element mounting locations;
• and
• at least one director, each director formed from a conductive material arranged in an L-shaped and located at a corner of the printed circuit board in the plane of the conductive ground layer, each director having a predetermined electrical length.