US 11,888,550 B2
Antenna including an NFC coil and a power coil that are magnetically coupled together
Hugues Creusy, Aix en Provence (FR)
Assigned to STMicroelectronics (Rousset) SAS, Rousset (FR)
Filed by STMicroelectronics (Rousset) SAS, Rousset (FR)
Filed on Jun. 21, 2022, as Appl. No. 17/845,368.
Claims priority of application No. 2106781 (FR), filed on Jun. 24, 2021.
Prior Publication US 2022/0416845 A1, Dec. 29, 2022
Int. Cl. H04B 5/00 (2006.01); H02J 50/23 (2016.01); H02J 50/27 (2016.01); H01Q 7/00 (2006.01)
CPC H04B 5/0081 (2013.01) [H01Q 7/00 (2013.01); H02J 50/23 (2016.02); H02J 50/27 (2016.02); H04B 5/0037 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A near field communications receiver device, comprising:
receiver circuitry;
wherein said receiver circuitry comprises a power receiving circuit and a data communications receiving circuit; and
an antenna coupled to the receiver circuitry and configured to receive a signal having a first frequency;
wherein said antenna comprises:
a first coil electrically connected to the power receiving circuit but not to the data communications receiving circuit, and where a resonant frequency of a circuit formed by the first coil and the power receiving circuit is equal to the first frequency; and
a second coil electrically connected to the data communications receiving circuit but not to the power receiving circuit, and where a resonant frequency of a circuit formed by the second coil and the data communications receiving circuit is equal to a second frequency greater than at least twice the first frequency when the power receiving circuit is activated and is equal to the first frequency when the power receiving circuit is deactivated;
wherein the first and second coils are magnetically coupled with a coupling coefficient greater than 0.5;
wherein the circuitry is configured, in a first operating phase to receive data for transfer to the data communications receiving circuit, to deactivate the power receiving circuit to produce an increased impedance of the power receiving circuit and cause, through the magnetic coupling of the first and second coils, a change in impedance of the second coil so that the second coil is configured to receive signals at the first frequency; and
wherein the circuit is further configured, in a second operating phase to receive power for transfer to the power receiving circuit, to activate the power receiving circuit to produce a decreased impedance of the power receiving circuit.