Wireless IC tag, reader-writer, and information processing system

An information processing system for performing wireless communication comprising:

• a wireless IC tag;
• and
• a reader-writer;
• wherein
• the wireless tag includes a wireless IC chip and at least two coil-shaped antennas;
• a first end of each of the at least two coil-shaped antennas is electrically connected to the wireless IC chip and second ends of the at least two coil-shaped antennas are electrically connected to each other;
• winding axes of the at least two coil-shaped antennas are arranged at different positions and the at least two coil-shaped antennas have a same winding direction;
• the reader-writer includes a reader-writer antenna and an information processing portion;
• the reader-writer antenna has a size substantially equal to a size of the at least two coil-shaped antennas of the wireless IC tag;
• a first end of the reader-writer antenna is electrically connected to a first end of the information processing portion, and a second end of the reader-writer antenna is electrically connected to a second end of the information processing portion;
• the at least two coil-shaped antennas of the wireless IC tag are wound and connected to each other so as to produce in-phase magnetic fields;
• the reader-writer antenna and the at least two coil shaped antennas of the wireless IC tag are overlaid directly on top of each other during communication;
• and
• the reader-writer antenna has a diameter substantially equal to a sum of diameters of the at least two coil-shaped antennas.