| 主权项 |
1. An antenna device comprising an antenna element which has an electrically conductive path continuing from one end part to the other end part and which has a feed section provided in the one and the other end parts of the electrically conductive path,
the antenna element having a first root section which includes the one end part of the electrically conductive path, a second root section which includes the other end part of the electrically conductive path, and an intermediate section which lies between the first root section and the second root section, the feed section being provided in the first root section and the second root section, the first root section and the second root section being arranged such that respective end parts of the first root section and the second root section are adjacent to each other and the first root section and the second root section extend along each other from the respective end parts so as to form a single winding section in which the respective end parts are enwound and so as to surround the feed section, and the first root section and the second root section being arranged in a first region that is part of a region where the electrically conductive path is formed, in the first region, tail end linear parts of the winding section, which tail end linear parts are directly connected with the intermediate section, extending in respective opposite directions, and at least one of the first and second root sections having a wider width part, the wider width part being formed such that a portion that overlaps a feed line connected with the feed section is larger in width than other portions; wherein the intermediate section is constituted by (i) a first part having a meander shape made up of at least one return pattern and (ii) a second part having a linear shape or having a meander shape made up of at least one return pattern; wherein the first part and the second part are arranged such that (a) a return direction of the meander shape of the first part and (b) a direction in which the linear shape of the second part extends or a return direction of the meander shape of the second part are perpendicular to each other; and wherein, in the antenna element, the first root section has (i) a first linear part that extends in a first direction from one end part of the antenna element and (ii) a second linear part that is connected with the first linear part via a first bending part and extends from the first bending part in a second direction that is opposite to the first direction, the second linear part being a tail end linear part, and the second root section has (a) a third linear part that extends in the second direction from the other end part of the antenna element and (b) a fourth linear part that is connected with the third linear party via a second bending part and extends from the second bending part in the first direction, the fourth linear part being a tail end linear part. |
