Patent ID: 7694886

Claim:
An RFID tag, comprising: a semiconductor chip storing therein information of an object to be discriminated and carrying out radio communication with a reader/writer device; and an antenna coil provided with a magnetic core member and connected electrically to said semiconductor chip, said semiconductor chip and said magnetic core member being wrapped by an insulation sheet carrying an interconnection pattern connecting a pad of said semiconductor chip and said antenna coil electrically and plural coil patterns on one side thereof, said plural coil patterns including bar-shaped conductor patterns formed obliquely to said magnetic core member, each of said bar-shaped conductor patterns having an end connected to an end of an adjacent coil pattern, said bar-shaped conductor patterns thereby forming together a spiral coil around said magnetic core member, said coil patterns being connected with each other at a part where said coil patterns overlap with each other, said insulation sheet carrying said magnetic core member at said one side in a part of a surface of said insulation sheet, said insulation sheet further carrying said semiconductor chip at said one side in a different part of said surface not carrying said magnetic core member, and said insulation sheet forming at least a part of the exterior surface of the RFID tag, and each of said bar-shaped conductor patterns having a hole at said part where said coil patterns overlap with each other, said hole penetrating through each of said bar-shaped conductor patterns and at least a part of said insulation sheet on each side of said overlapping coil patterns.