Patent ID: 8259023

Claim:
An antenna device comprising: an antenna coil including: a planar magnetic core; a flexible substrate having a surface on which conductors are provided and being wound around the magnetic core; a first coil portion defined by a first plurality of the conductors and having a coil axis substantially parallel to a main surface of the magnetic core; a second coil portion defined by a second plurality of the conductors, having a coil axis substantially parallel to the main surface of the magnetic core, being connected to the first coil portion, and having a winding direction opposite to that of the first coil portion; and a non-winding portion provided between the first coil portion and the second coil portion on the main surface of the magnetic core and including none of the conductors; and a circuit substrate on which the antenna coil is mounted; wherein a main surface of the antenna coil faces a main surface of the circuit substrate; and the antenna coil is arranged such that an end portion of the first coil portion and an end portion of the second coil portion that are disposed on opposite sides of the non-winding portion are located at or adjacent to two opposite end portions of the circuit substrate.