Antenna device

An antenna device comprising:

• a substrate;
• a plurality of antenna elements supported by the substrate, each of the antenna elements having a feeding point;
• and
• a plurality of parasitic elements supported by the substrate and having no feeding point,
• wherein at least a first group of the plurality of antenna elements is disposed to be spaced apart from each other along a first predetermined direction,
• wherein at least a second group of the plurality of antenna elements is disposed to be spaced apart from each other along a second predetermined direction perpendicular to the first predetermined direction,
• wherein at least a third group of the plurality of antenna elements is disposed to be spaced apart from each other along a third predetermined direction different from the first and second predetermined directions,
• wherein a first pair of parasitic elements among the plurality of parasitic elements is mutually spaced apart in the first predetermined direction on respective end sides of the first group of antenna elements,
• wherein a second pair of parasitic elements among the plurality of parasitic elements is mutually spaced apart in the second predetermined direction on respective end sides of the second group of antenna elements,
• wherein a third pair of parasitic elements among the plurality of parasitic elements is mutually spaced apart in the third predetermined direction on respective end sides of the third group of antenna elements, and
• wherein a first antenna element among the plurality of antenna elements is included in each of the first, second, and third groups of antenna elements and each pair of parasitic elements is symmetrical to the first antenna element.