EP2374095

A radio frequency identification RFID device (100, 200, 300, 400, 500) comprising: - a wireless communication device (101, 201, 301, 401), such as an RFID chip or strap, having at least a pair of contact points (221), and - an antenna structure (102, 202, 302, 402, 502) having a sheet (103, 203, 303, 403, 503, 603) of electrically conductive material being provided with an inner opening (104, 204, 304, 404, 504) so as to provide a hole through the antenna structure (102, 202, 302, 402, 502), the sheet (103, 203, 303, 403, 503, 603) further being provided with an elongated slot (105, 205, 305, 405) with a first and a second side, the slot (105, 205, 305, 405) having an inner end (106, 206, 306, 406) at a periphery of the opening (104, 204, 304, 404, 504) and an outer end (107, 207, 307, 407) at a periphery of the sheet (103, 203, 303, 403, 503, 603), the slot (105, 205, 305, 405) being formed so as to provide a spacing between the first side and the second side, wherein - the conductive material is electrically connected from the first side of the slot (105, 205, 305, 405) to the second side of the slot (105, 205, 305, 405) via contact points (221) and through the communication device (101, 201, 301, 401) at a position be- tween the inner end (106, 206, 306, 406) and the outer end (107, 207, 307, 407).

From the international application WO2010063287