Antenna device, communication device, and method for manufacturing antenna device

An antenna device, comprising:

• a connection portion having a first surface and a second surface opposite to the first surface;
• a first portion and a second portion connected to the first surface of the connection portion;
• a first radiating element disposed on the first portion;
• and
• a second radiating element disposed on the second portion,
• wherein the connection portion includes
• a first flat board portion,
• a bent portion extending from the first flat board portion, and bent to have the first surface facing outward, and
• a second flat board portion further extended from the bent portion,
• wherein the first portion includes a first extension portion connected to the first surface in the first flat board portion, and extending toward the bent portion from a boundary between the first flat board portion and the bent portion,
• wherein the second portion includes a second extension portion connected to the first surface in the second flat board portion, and extending toward the bent portion from a boundary between the second flat board portion and the bent portion,
• wherein at least a part of the first extension portion and at least a part of the second extension portion are located at the same position in a first direction parallel to an intersection line of the plane along which the first flat board portion extends and the plane along which the second flat board portion extends,
• wherein at least a part of the first radiating element is disposed at the first extension portion,
• wherein a first distance is a distance in a direction perpendicular to a first reference plane from the first reference plane to a surface intersecting a thickness direction of the first extension portion, and the first reference plane is orthogonal to the first surface in the first flat board portion and parallel to the first direction,
• wherein a second distance is a distance in a direction perpendicular to a second reference plane from the second reference plane to a surface intersecting a thickness direction of the second extension portion, and the second reference plane is orthogonal to the first surface in the second flat board portion and parallel to the first direction,
• wherein a third distance is a shortest distance along the first surface from the first reference plane to the second reference plane,
• wherein a sum of the first distance and the second distance at the same height from the first surface is smaller than or equal to the third distance, and
• wherein a sum of a maximum value of the first distance and a maximum value of the second distance is longer than the third distance.