Antenna device

An antenna device comprising:

• an antenna layer having first and second radiation conductors;
• a divider layer stacked with the antenna layer, the divider layer having a first divider circuit for distributing a first antenna signal to the first and second radiation conductors;
• a ground pattern provided between the divider layer and the antenna layer,
• wherein the antenna layer further has:
• a plurality of first ground pillars surrounding the first radiation conductor in a plan view as viewed from a stacking direction;
• and
• a plurality of second ground pillars different from the plurality of first ground pillars, the plurality of second ground pillars surrounding the second radiation conductor in a plan view as viewed from the stacking direction, and
• wherein the ground pattern has a first area that overlaps a first space surrounded by the plurality of first ground pillars in a plan view as viewed from the stacking direction, a second area that overlaps a second space surrounded by the plurality of second ground pillars in a plan view as viewed from the stacking direction, and a third area that connects the first and second areas.