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US 9,438,317 B2Granted
Card detect architecture for near field communications
AssigneeIntel Corporation
InventorsNiranjan Karandikar, Timothy F. Cox
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Abstract
Described herein are architectures, platforms and methods for detecting near field communication (NFC) cards/tags by a NFC enabled device, using a coupled impedance signature unique to the NFC cards/tags and the NFC enabled device.
Claims20
A near field communication (NFC) device comprising:
- an antenna;
- an NFC controller comprising:
- an impedance detector configured to detect rising impedance at the antenna if an object is placed near the antenna;
- and
- an energy source configured to be turned on by the impedance detector if the impedance detector detects the rising impedance.
2 more elements
A near field communication (NFC) module comprising:
- an impedance detector configured to detect impedance at an antenna of a NFC device;
- and
- a power amplifier configured to turn on and provide power to an NFC card if the NFC card is placed in proximity of the antenna and the impedance detector detects a rising coupling impedance between the antenna and the NFC card.
A method of detecting a near field communication (NFC) card comprising:
- measuring impedance between an object and an NFC enabled device;
- determining if the impedance is rising;
- powering an energy source to transmit power to the object if the impedance is determined to be rising;
- and
- communicating with the object.
2 more elements
Dependencies are inferred from the claim text.