Wireless communication device

A wireless communication device comprising:

• a power storage unit with a second surface located oppositely to a first surface;
• and
• an antenna board implemented with an antenna facing the first surface;
• and
• a circuit board facing the second surface of the power storage unit;
• and
• a metal layer formed on a surface of the circuit board facing the power storage unit, connected to a terminal of the power storage unit;
• and
• a ground line which connects the antenna board and the metal layer;
• and
• a wireless communication unit implemented to the circuit board, located oppositely to a surface facing the power storage unit;
• and
• a signal line piercing through the circuit board, connecting the antenna board and the wireless communication unit;
• and
• a first planar element of the antenna shaped symmetrically in respect to an axis of symmetry;
• and
• a second planar element of the antenna located adjacently to the first planar element and shaped symmetrically in respect to the axis of symmetry,
• wherein the length of the first planar element respect to the axis of symmetry is approximately one-fourth of a wavelength corresponding to a first resonance of the antenna,
• the first planar element having a slot with a length approximately half of a wavelength corresponding to a second resonance frequency of the antenna,
• the first planar element connected to the signal line at a first point located on the axis of symmetry, and
• the second planar element connected to the ground line at a second point located on the axis of symmetry.