Wireless IC tag, reader-writer, and information processing system
First Claim
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1. An information processing system for performing wireless communication comprising:
- a wireless IC tag; and
a reader-writer;
whereinthe 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.
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Abstract
A wireless IC tag includes a wireless IC chip and two coil-shaped antennas. One end of each of the coil-shaped antennas is electrically connected to the wireless IC chip, and the other ends of the coil-shaped antennas are electrically connected to each other. The winding axes of the coil-shaped antennas are arranged at different positions, and the coil-shaped antennas have the same winding direction. A reader-writer includes an antenna connected to an information processing circuit. The antenna is electromagnetically coupled to the coil-shaped antennas for communication.
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Citations
13 Claims
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1. An information processing system for performing wireless communication comprising:
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a wireless IC tag; and a reader-writer;
whereinthe 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification