US 12,361,255 B2
Remote powered contactless card
Franck Montaudon, Meylan (FR); and Julien Goulier, Grenoble (FR)
Assigned to STMICROELECTRONICS France, Montrouge (FR); and STMICROELECTRONICS (GRENOBLE 2) SAS, Grenoble (FR)
Filed by STMicroelectronics France, Montrouge (FR)
Filed on May 12, 2023, as Appl. No. 18/316,964.
Claims priority of application No. 2205059 (FR), filed on May 25, 2022.
Prior Publication US 2023/0385593 A1, Nov. 30, 2023
Int. Cl. G06K 19/077 (2006.01)
CPC G06K 19/07773 (2013.01) 20 Claims
OG exemplary drawing
 
1. An electronic device comprising:
a first electronic circuit comprising a capacitive element with a variable capacitance, the first electronic circuit configured to:
couple the capacitive element to an antenna;
measure, by successive iterations, a first analog signal representative of a variation of an instantaneous electric power received by the antenna or representative of the instantaneous electric power received by the antenna; and
modify the capacitance of the capacitive element until an amplitude of the instantaneous electric power received by the antenna is a maximum,
wherein the antenna is configured to capture an amplitude-modulated electromagnetic field.