| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device that is capable of achieving both miniaturization and high performance even in a low frequency band.SOLUTION: An antenna device includes: a substrate main body 2; a ground surface GND formed for a surface of the substrate main body; an antenna pattern 3 formed for the surface of the substrate main body to exist while extending; and an antenna element AT of a dielectric antenna connected to a midpoint of the antenna pattern. The antenna pattern has a first extension part 3a, a second extension part 3b to whose midpoint the antenna element is connected, and a third extension part 3c whose base end is connected to the ground surface at a position spaced apart from a power feed point. A tip end part of the second extension part is a wide part 3d that exists while extending in a belt shape from the antenna element in a direction, in which a distance from the first extension part increases, and has a width W that is equal to or wider than that of an end part of the antenna element. |
