| 摘要 |
PROBLEM TO BE SOLVED: To suppress deterioration in characteristics of an antenna coil.SOLUTION: An antenna device includes: a substrate having a mounting surface; a magnetic core; a conductor layer provided on the substrate in a manner such that a corner of the conductor layer is close to a corner of the substrate; and an antenna coil that includes a coil conductor and is mounted on the mounting surface, the coil conductor having a spiral shape and progressing in a direction in parallel to the mounting surface while rotating around the magnetic core. The antenna coil does not include another coil conductor that has a winding axis different from a winding axis of the coil conductor. The coil conductor is close to the corner of the mounting surface and the corner of the conductor layer and includes a first part coil conductor and a second part coil conductor. The first part coil conductor and the second part coil conductor are formed in parallel to the mounting surface, and in a plan view from a normal direction of the mounting surface, a vertical line of each of the first part coil conductors intersects with each of two sides forming the corner in the mounting surface.SELECTED DRAWING: Figure 5A |
