NFC tag emulation mode with constant magnetic field
First Claim
1. A method for performing electromagnetic induction communication consisting in transmitting modulation data to a first communication device from a second communication device, said method comprising:
- coupling a first antenna of said first communication device and a second antenna of said second communication device;
generating a magnetic field by supplying a first current through said first antenna; and
modulating said magnetic field according to said modulation data,wherein said first current is regulated so as to be substantially constant, by introducing a regulating current which is a function of said magnetic field, and wherein said first communication device determines said modulation data from said regulating current.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for performing electromagnetic induction communication enables transmitting modulation data between communication devices. The method includes coupling a first antenna of a first communication device and a second antenna of a second communication device, generating a magnetic field by supplying a first current through the first antenna, and modulating the magnetic field according to the modulation data. The first current is regulated so as to be substantially constant, by introducing a regulating current, which is function of the magnetic field. The first communication device determines the modulation data from the regulating current.
7 Citations
12 Claims
-
1. A method for performing electromagnetic induction communication consisting in transmitting modulation data to a first communication device from a second communication device, said method comprising:
-
coupling a first antenna of said first communication device and a second antenna of said second communication device; generating a magnetic field by supplying a first current through said first antenna; and modulating said magnetic field according to said modulation data, wherein said first current is regulated so as to be substantially constant, by introducing a regulating current which is a function of said magnetic field, and wherein said first communication device determines said modulation data from said regulating current. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for performing electromagnetic induction communication consisting in transmitting modulation data to a first communication device from a second communication device, said method comprising:
-
coupling a first antenna of said first communication device and a second antenna of said second communication device; generating a magnetic field by supplying a first current through said first antenna; and modulating said magnetic field according to said modulation data, wherein said first current is regulated so as to be substantially constant, by introducing a regulating current which is a function of said magnetic field, and wherein said first communication device determines said modulation data from said regulating current, wherein said regulating current is copied by a current mirror so as to provide a copied regulating current. - View Dependent Claims (9)
-
-
10. A reader device comprising:
-
a first antenna configured to create an electromagnetic coupling with a second antenna of a tag emulator device, to generate a magnetic field according to a first current flowing through the first antenna, and to detect a load modulation of said magnetic field, representative of modulation data provided by said tag emulator device by modulating said first current; a regulation element configured to determine a regulating current as a function of said magnetic field; and an injection element configured to inject said regulating current so as said first current is constant, and to determine said modulation data from said regulation current. - View Dependent Claims (11, 12)
-
Specification