US 12,423,548 B2
Chip card with radio-frequency antennas
Ahmed Ali, Courbevoie (FR)
Assigned to IDEMIA FRANCE, Courbevoie (FR)
Filed by IDEMIA FRANCE, Courbevoie (FR)
Filed on May 14, 2024, as Appl. No. 18/663,253.
Claims priority of application No. 2304806 (FR), filed on May 15, 2023.
Prior Publication US 2024/0386232 A1, Nov. 21, 2024
Int. Cl. G06K 19/077 (2006.01); H01Q 1/22 (2006.01); H01Q 1/38 (2006.01); H01Q 1/50 (2006.01)
CPC G06K 19/07722 (2013.01) [G06K 19/07749 (2013.01); H01Q 1/2283 (2013.01); H01Q 1/38 (2013.01); H01Q 1/50 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A chip card comprising:
a card body formed at least partly by a metal layer having a cut-out zone;
an RF chip;
a first RF antenna that is placed in or facing the cut-out zone and electrically connected to the RF chip;
at least one RF antenna portion that is electrically insulated from the metal layer and from the first RF antenna, said at least one antenna portion being a second RF antenna including:
a first antenna portion lying facing a portion of the metal layer; and
a second antenna portion, electrically connected to the first antenna portion, and lying facing the cut-out zone so as to allow magnetic coupling to the first antenna,
wherein the metal layer is at least partially covered by a coating that is more conductive than the metal layer, and
wherein said first antenna portion lies facing one portion of the metal layer covered by said coating to collect a second current induced by first eddy currents flowing at least over the coating of the metal layer and to allow the second antenna portion to be coupled to the first RF antenna.