| 摘要 |
PROBLEM TO BE SOLVED: To obtain a coil unit in which a pattern size can be minimized, and a necessary high inductance can be easily obtained by forming coils in each base material to be stacked, and serially connecting the coils so that the generating directions of a magnetic field can be made the same. SOLUTION: A coil unit 10 is provided with plural base materials 11 to be stacked and coils 12 formed in each base material 11. Each base material 11 is formed of proper insulating materials. An IC module 15 including a communication circuit, a microprocessor, and writable non-volatile memory or the like is mounted on the upper face of the base material 11 in the uppermost layer, and lines 15a and 15b drawn from the IC module 15 are formed. The coil 12 is formed like a second-dimensional spiral shape on the lower face of each base material 11. Then, the coils 12 formed on the lower face of each base material 11 are serially connected so that the generating directions of a magnetic field can be made the same by currents from the IC module 15.
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