Antenna device and IC card having the same

An IC card comprising:

• an antenna device comprising:
• a first metal plate having a first slit extending in a long side direction thereof and a second slit extending in a short side direction thereof;
• a first coil disposed so as to overlap with the first metal plate in a plan view and circling along an outer edge of the first metal plate;
• and
• a second coil electrically connected to the first coil, disposed so as to be surrounded by the first coil, and disposed so as to overlap with the first slit;
• a second metal plate having an opening;
• and
• an IC module disposed in the opening of the second metal plate,
• wherein the first slit has a first end that is open to divide the outer edge of the first metal plate and a second end terminating without reaching the outer edge of the first metal plate,
• wherein the second slit has a third end that is open to divide the outer edge of the first metal plate and a fourth end terminating without reaching the outer edge of the first metal plate,
• wherein a length of the first slit in the long side direction is longer than half a length of the metal plate in the long side direction, or a length of the second slit in the short side direction is longer than half a length of the metal plate in the short side direction, and
• wherein the first and second coils are sandwiched between the first and second metal plates such that the IC module overlaps with the second coil.

An antenna device comprising:

• a metal plate having first and second outer edges extending in a first direction, third and fourth outer edges extending in a second direction perpendicular to the first direction, a first slit extending in the second direction, and a second slit extending in the first direction;
• a first coil disposed so as to overlap with the metal plate in a third direction perpendicular to the first and second directions and circling along the first, third, second, and fourth outer edges of the metal plate;
• and
• a second coil electrically connected to the first coil, disposed so as to be surrounded by the first coil, and disposed so as to overlap with the first slit in the third direction,
• wherein the first slit has a first end in the second direction that is open to divide the first outer edge of the metal plate and a second end in the second direction terminating without reaching the second outer edge of the metal plate,
• wherein the second slit has a third end in the first direction that is open to divide the third outer edge of the metal plate and a fourth end in the first direction terminating without reaching the fourth outer edge of the metal plate, and
• wherein a virtual line on the metal plate extending in the second direction from the second end of the first slit to the second outer edge of the metal plate intersects with the second slit.