Antenna device, communication terminal device, and communication terminal device cover

摘要

An antenna device includes a feed coil including a coil conductor and being connected to a feed circuit, and an antenna coil including a coil conductor, a portion of the antenna coil being a coupler portion that electromagnetically couples with the feed coil. The winding axis of the coil conductor of the feed coil is not parallel to the direction along which the coil conductor of the antenna coil at the coupler portion extends. Further, at other than the coupler portion, a first magnetic body portion is arranged at a feed coil side of the antenna coil, and at the coupler portion, a second magnetic body portion is arranged at a side of the antenna coil opposite to the feed coil.

主权项

1. A communication terminal device comprising:
a casing; a feed circuit disposed inside the casing; a communication terminal device cover disposed outside the casing; and an antenna device including:
a feed coil including a coil conductor and being connected to a feed circuit; andan antenna coil including a coil conductor, a portion of the antenna coil being a coupler portion that electromagnetically couples with the feed coil; wherein a winding axis of the coil conductor of the feed coil and a direction along which the coil conductor of the antenna coil at the coupler portion are skewed relative to each other; at a location other than the coupler portion, a first magnetic body portion is arranged at a feed coil side of the antenna coil; at the coupler portion, a second magnetic body portion is arranged at a side of the antenna coil opposite to the feed coil side; and the antenna coil is disposed on a surface of or inside the communication terminal device cover.