US 12,260,286 B2
Method for determining a value of an electromagnetic field strength, method for coupling a reader, chip card, and reader for a chip card
Michael Baldischweiler, Munich (DE)
Assigned to GIESECKE+DEVRIENT EPAYMENTS GMBH, Munich (DE)
Appl. No. 18/552,273
Filed by GIESECKE+DEVRIENT EPAYMENTS GMBH, Munich (DE)
PCT Filed Mar. 23, 2022, PCT No. PCT/EP2022/025119
§ 371(c)(1), (2) Date Sep. 25, 2023,
PCT Pub. No. WO2022/199895, PCT Pub. Date Sep. 29, 2022.
Claims priority of application No. 10 2021 001 583.5 (DE), filed on Mar. 25, 2021.
Prior Publication US 2024/0062024 A1, Feb. 22, 2024
Int. Cl. G06K 7/10 (2006.01)
CPC G06K 7/10366 (2013.01) 12 Claims
OG exemplary drawing
 
1. A method for determining a value of an electromagnetic field strength by means of a chip card, comprising the steps of:
providing a chip card having a coil and an integrated circuit;
calibrating the chip card by means of different values of an electromagnetic field strength,
wherein in each case a power of the integrated circuit is determined at a specific value of the electromagnetic field strength;
establishing a correlation of the different values of the electromagnetic field strengths with a respective corresponding power of the integrated circuit;
applying an electromagnetic field strength of unknown value to the chip card;
determining a power of the integrated circuit; and
determining the value of the electromagnetic field strength corresponding to this power by means of the correlation.