Positioning guidance for increasing reliability of near-field communications
First Claim
1. A method of operating an NFC-enabled device, comprising:
- detecting, by the NFC-enabled device, a respective current in each of a plurality of NFC antennas having antenna terminals, in an NFC antenna array, by measuring an averaged DC current when a shunt regulator is operating and measuring a peak-to-peak voltage across the antenna terminals when the peak-to-peak voltage is less than a threshold voltage of the shunt regulator, the respective currents induced by a common NFC reader field; and
determining, based at least in part on the magnitude of each of the respective currents, if changing a position of the NFC-enabled device would improve communicative interaction with the NFC reader field;
wherein the NFC antenna array is disposed on the NFC-enabled device.
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Accused Products
Abstract
To promote ease of use, as well as a reduction in bit error rates during extended data exchange between a coupled NFC tag/reader pair, signal strength is measured from a plurality of NFC tag antennas each positioned differently with respect to a common reader field, and differences in signal strength are used to determine an optimum positioning of the tag, or tag emulator, with respect to the reader. Alternative embodiments may include signal time of flight for determining orientation of the NFC antennas within the reader field. Information is generated by the tag, or tag emulator, and output by the tag, or tag emulator, such that a user may direct the positioning of the tag, or tag emulator, for improved communication with the reader.
176 Citations
22 Claims
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1. A method of operating an NFC-enabled device, comprising:
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detecting, by the NFC-enabled device, a respective current in each of a plurality of NFC antennas having antenna terminals, in an NFC antenna array, by measuring an averaged DC current when a shunt regulator is operating and measuring a peak-to-peak voltage across the antenna terminals when the peak-to-peak voltage is less than a threshold voltage of the shunt regulator, the respective currents induced by a common NFC reader field; and determining, based at least in part on the magnitude of each of the respective currents, if changing a position of the NFC-enabled device would improve communicative interaction with the NFC reader field; wherein the NFC antenna array is disposed on the NFC-enabled device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 21)
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11. A method of operating an NFC tag emulator, comprising:
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coupling to an NFC reader field at each of a plurality of NFC antennas having terminals, each of the plurality of NFC antennas disposed on the tag emulator; determining, by the tag emulator, a relative coupling strength at each of the plurality of NFC antennas by measuring an averaged DC current when a shunt regulator is operating and measuring a peak-to-peak voltage across the antenna terminals when the peak-to-peak voltage is less than a threshold voltage of the shunt regulator; and generating, by the tag emulator, position-correction information based at least in part on the relative coupling strength at each of the plurality of antennas; wherein each of the plurality of NFC antennas has a known spaced-apart relationship to the other NFC antennas of the plurality of NFC antennas. - View Dependent Claims (12, 13, 14, 15, 22)
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16. An NFC-enabled device, comprising:
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an NFC antenna array having at least three antennas, each of the at least three antennas having a corresponding pair of antenna terminals and a corresponding shunt regulator; a plurality of field strength detector circuits, each one of the plurality of field strength detector circuits coupled to a corresponding one of the at the least three antennas, and each one of the plurality of field strength detector circuits configured to measure an averaged DC current when the shunt regulator coupled to its corresponding antenna is operating, and further configured to measure a peak-to-peak voltage across the antenna terminals when the peak-to-peak voltage is less than a threshold voltage of the shunt regulator; a computational resource coupled to each of the plurality of field strength detector circuits, the computational resource configured, based at least in part on the signals indicative of the strength of the received signal at each antenna of the NFC antenna array, to determine whether the NFC-enabled device should be repositioned for improved communicative interaction with a reader device; and a visual display device coupled to the computational resource; wherein the visual display, under control of the computational resource, provides a user-perceivable output indicating the distance and direction for repositioning the NFC-enabled device. - View Dependent Claims (17, 18, 19, 20)
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Specification