Patent ID: 8616455

Claim:
A method for manufacturing a radio frequency identification device (RFID) comprising a flat substrate equipped with an antenna ( 14 ) and a chip ( 25 ) connected to the antenna, said antenna formed by the winding of several turns ( 11 ) comprises a zone where the turns overlap, an insulating strip ( 16 ) of dielectric material separating the overlaid antenna turns where they overlap, the method including the following steps: a) producing the antenna consisting in printing turns, two contacts ( 17 , 18 ) of conductive ink and an insulating strip ( 16 ) made of dielectric material at the location where the turns overlap, and in subjecting said substrate to heat treatment in order to bake said ink, b) connecting said chip ( 25 ) to said substrate ( 10 ) of the side of said antenna ( 14 ), c) overlaying a second layer ( 20 ) on said substrate on the side of the antenna, this second layer comprising a first perforation ( 39 ) centered on the chip and a second perforation ( 26 ) centered on said insulating strip ( 16 ) of antenna overlap zone, d) overlaying a third layer ( 30 ) on the second layer, e) laminating the three layers together (10, 20, 30), wherein said second perforation ( 2 ) passes through an entire thickness of said second layer ( 20 ) and wherein step a) includes the following steps: a1) printing an undercoat ( 12 ) comprising an ink, resin or varnish on a predetermined zone on said antenna support substrate ( 10 ), said zone corresponding to an imprint of the antenna or being slightly larger than it, and a2) printing the antenna on said undercoat ( 12 ).