Patent ID: 8668151

Claim:
A wireless IC device comprising: a wireless IC; a feed circuit substrate that is coupled to the wireless IC and includes a feed circuit including a resonant circuit and/or a matching circuit, the resonant circuit and/or the matching circuit including at least one inductance element; first and second radiation plates arranged to radiate a transmission signal provided from the feed circuit and/or provide a received signal to the feed circuit; and a protective layer or a metal case covering the wireless IC and provided on one main surface of the feed circuit substrate; wherein the first radiation plate is an electrode disposed on the protective layer or the metal case, and the second radiation plate is disposed on another main surface of the feed circuit substrate; the second radiation plate is larger in size than the feed circuit substrate and the first radiation plate; the wireless IC is disposed on the feed circuit substrate; the first radiation plate is an inverted-F antenna or an inverted-L antenna; and when viewed in a direction perpendicular to the one main surface of the feed circuit board, the first radiation plate overlaps an entirety of the feed circuit and an entirety of the wireless IC.