| 摘要 |
To provide a wireless IC device that is less susceptible to, for example, the environment in which the, wireless IC device is used, that is capable of suppressing a variation in the radiation characteristics, and that is capable of being used in a wideband. A wireless IC device includes a wireless IC, a feeder circuit board (20), and a radiation strip (52). The feeder circuit board (20) is electrically connected to the wireless IC and incorporates a feeder circuit (21) including a resonant circuit and/or a matching circuit that includes inductance elements (L1, L2, L3, L4). The feeder circuit board (20) is adhered to the radiation strip (52) that radiates a transmission signal supplied from the feeder circuit (21) and supplies a received signal to the feeder circuit (21). The inductance elements (L1, L2) and the inductance elements (L3, L4) are helically formed with being wound in opposite directions. The inductance elements (L1, L2) are out of phase with and coupled to the inductance elements (L3, L4).
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