Wireless IC device and electromagnetic coupling module

摘要

A wireless IC device includes a wireless IC chip, a feeder circuit substrate which is coupled to the wireless IC chip and includes a feeder circuit including an inductance element, and a radiation plate. The inductance element includes a plurality of stacked layers having coil conductors electrically connected, and a coil conductor electrically connected in a middle portion of the inductance element is arranged at an end position in the coil axis direction and faces a coupling portion of the radiation plate.

主权项

1. A wireless IC device comprising:
a wireless IC; a feeder circuit substrate including a plurality of sheets and a feeder circuit connected to the wireless IC, the feeder circuit including an inductance element; a radiation plate arranged to radiate a transmission signal supplied from the feeder circuit or supply a reception signal to the feeder circuit; and a plate-shaped coupling portion connected to the radiation plate; wherein the inductance element includes first, second, and third coil conductors connected in series in this order to one another; each of the first, second, and third coil conductors is disposed on a different one of the plurality of sheets from one another, the plurality of sheets are disposed in planes that are parallel to each other; the plate-shaped coupling portion faces the second coil conductor; the feeder circuit is connected to the radiation plate via an electromagnetic coupling between the plate-shaped coupling portion and the second coil conductor; and the second coil conductor is arranged closer to the plate-shaped coupling portion than the first and third coil conductors with respect to the parallel planes of the plurality of sheets.