Patent ID: 8011589

Claim:
A wireless IC device comprising: a radiation plate; a wireless IC chip; and a substrate on which the wireless IC chip is mounted, the substrate being provided with a feed circuit, the feed circuit including at least one of a resonant circuit or a matching circuit, the at least one of the resonant circuit or the matching circuit including an inductance element, the feed circuit being electromagnetically coupled to the radiation plate; wherein the substrate is made of a resin material and includes a recess in a first main surface thereof; the substrate is provided with a wiring electrode arranged along a bottom surface of the recess, the wiring electrode being electrically connected to the feed circuit; the substrate is provided with a wedge member made of a different material from that of the resin material, the wedge member extending between the bottom surface of the recess and a second main surface of the substrate so as to be spaced apart from the wiring electrode; the wireless IC chip is mounted in the recess and coupled to the wiring electrode.