| 摘要 |
An antenna coil includes: an air-core type flat coil body having a ring shape; and a coil case having a ring shape corresponding to the ring shape of the coil body. The coil case includes a coil accommodation space for accommodating the coil body. The coil accommodation space is disposed in a circumferential direction of the ring shape of the coil case. The coil body includes a plurality of unit coils, each of which has a same winding direction and a same number of turns. The unit coils are connected in parallel each other.
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