US 11,989,608 B2
Electronic card with biometric authentication function
Tatsuya Hosotani, Nagaokakyo (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed on Dec. 2, 2022, as Appl. No. 18/061,314.
Application 18/061,314 is a continuation of application No. PCT/JP2021/004029, filed on Feb. 4, 2021.
Claims priority of application No. 2020-098102 (JP), filed on Jun. 5, 2020.
Prior Publication US 2023/0095548 A1, Mar. 30, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G06K 19/073 (2006.01)
CPC G06K 19/07354 (2013.01) 20 Claims
OG exemplary drawing
 
1. An electronic card with biometric authentication function comprising:
a communication antenna for short-range wireless communication;
a wireless communication IC electrically connected to the communication antenna and configured to perform short-range wireless communication;
a receiving coil magnetically coupled with the communication antenna;
a resonant capacitor configuring a receiving resonant circuit together with the receiving coil;
a rectifying and smoothing circuit connected to the receiving resonant circuit; and
a biometric sensor and a biometric authentication circuit configured to operate by using power caused by the receiving coil,
wherein
the communication antenna and the receiving coil are configured to respond to a magnetic field in a same frequency band for the short-range wireless communication,
the receiving coil is configured to receive power from the magnetic field in a same frequency band for the short-range wireless communication,
the biometric authentication circuit is configured to cause the biometric sensor to operate by using the power received from the receiving resonant circuit, and
the communication antenna and the receiving coil are configured to share electromagnetic field energy resonating in the same frequency band for the short-range wireless communication, the electromagnetic field energy being shared because of magnetic coupling between the communication antenna and the receiving coil.