MAGNETIC MATERIAL ANTENNA AND ANTENNA DEVICE

摘要

On a flexible substrate (23), a spiral coil conductor (24) having the winding center section as a conductor opening section (CW) is formed. The flexible substrate (23) is bent in U-shape to surround a magnetic material core (22) along a line passing the conductor opening section (CW). The magnetic material core (22) is arranged with its end surface facing the bent section of the flexible substrate (23). On the end surface, at a portion facing a coil conductor section (CC) of the bent section of the flexible substrate (23), notched sections (22a, 22b) separated from the coil conductor section (CC) are arranged. Thus, the required number of windings is ensured, and radiation efficiency of a magnetic flux is improved by widening an opening of an antenna close to the magnetic flux transmitting surface of the magnetic material core.