| 摘要 |
A wireless IC device includes a wireless IC chip, a power feeding circuit substrate including a power feeding circuit including inductance elements, and radiation plates including plate-shaped coupling units. The inductance elements have spiral shapes and are wound in directions opposite to each other. The plate-shaped coupling units in the radiation plates are disposed in a vicinity of the inductance elements so as to be perpendicular or substantially perpendicular to the winding axes of the inductance elements, and eddy currents occur in the plate-shaped coupling units so as to couple the power feeding circuit and the radiation plates with each other. The plate-shaped coupling units may also have spiral shapes. |
