APPARATUS AND METHOD FOR IMPROVED NEAR-FIELD COMMUNICATION (NFC) DATA TRANSMISSIONS
An example apparatus, method, and computer program product for initiating a near-field communication (NFC) data transmission from a card emulation NFC apparatus are provided. An example card emulation NFC apparatus may comprise an antenna and a card emulation controller electrically coupled to the antenna. The card emulation controller may be configured to detect a presence of a foreign object based at least in part on one or more electrical parameters of the antenna and initiate a polling command wait period upon detection of the foreign object. The card emulation controller may be further configured to adjust a physical property of the antenna in an instance in which the polling command wait period expires and a polling command is not received.
1 . A card emulation near-field communication (NFC) apparatus, comprising:
an antenna; and
a card emulation controller electrically coupled to the antenna, comprising one or more processors and one or more storage devices storing instructions that are operable, when executed by the one or more processors, to:
initiate at least one foreign object detection process to detect a presence of a foreign object based at least in part on one or more electrical parameters of the antenna;
initiate a polling command wait period; and
adjust a physical property of the antenna in an instance in which the polling command wait period expires and a polling command is not received.
2 . The apparatus of claim 1 , wherein the one or more electrical parameters comprise an impedance of the antenna.
3 . The apparatus of claim 1 , wherein the physical property of the antenna comprises a resonant frequency of the antenna.
4 . The apparatus of claim 3 , wherein the antenna is configured to operate at a first resonant frequency and wherein adjusting the physical property of the antenna comprises configuring the antenna to operate at a second resonant frequency.
5 . The apparatus of claim 4 , wherein the first resonant frequency is between 10 megahertz and 19 megahertz.
6 . The apparatus of claim 4 , wherein the difference between the second resonant frequency and the first resonant frequency is equal to or greater than 100 kilohertz.
7 . The apparatus of claim 3 , further comprising:
a card emulation tuning circuit electrically coupled to the card emulation controller and the antenna, the card emulation tuning circuit comprising:
one or more variable capacitors configured to adjust the resonant frequency of the antenna,
wherein adjusting the physical property of the antenna comprises adjusting a capacitance value of at least one of the one or more variable capacitors.
8 . The apparatus of claim 1 , wherein the foreign object is a master near-field communication device.
9 . The apparatus of claim 8 , wherein adjusting the physical property of the antenna in an instance in which the polling command wait period expires and the polling command is not received causes the master near-field communication device to resend the polling command.
10 . The apparatus of claim 1 , wherein the polling command wait period is between 5.1 milliseconds and 3 seconds.
11 . A method for initiating an NFC data transmission, the method comprising:
initiating, at a card emulation controller of a card emulation near-field communication apparatus, at least one foreign object detection process to detect a presence of a foreign object based at least in part on one or more electrical parameters of an antenna, wherein the antenna is electrically coupled to the card emulation controller;
initiating a polling command wait period; and
adjusting a physical property of the antenna in an instance in which the polling command wait period expires and a polling command is not received.
12 . The method of claim 11 , wherein the foreign object is a master NFC device.
13 . The method of claim 12 , wherein adjusting the physical property of the antenna in an instance in which the polling command wait period expires and the polling command is not received causes the master NFC device to resend the polling command.
14 . The method of claim 13 , wherein the one or more electrical parameters comprise an impedance of the antenna.
15 . The method of claim 11 , wherein the physical property of the antenna comprises a resonant frequency of the antenna.
16 . The method of claim 15 , wherein the antenna is configured to operate at a first resonant frequency and wherein adjusting the physical property of the antenna comprises configuring the antenna to operate at a second resonant frequency.
17 . The method of claim 15 , further comprising:
adjusting one or more variable capacitors comprising a card emulation tuning circuit electrically coupled to the card emulation controller and the antenna, wherein the one or more variable capacitors are configured to adjust the resonant frequency of the antenna.
18 . A computer program product for initiating an NFC transmission, the computer program product comprising at least one non-transitory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising an executable portion configured to:
detect, at a card emulation controller of a card emulation near-field communication apparatus, a presence of a foreign object based at least in part on one or more electrical parameters of an antenna, wherein the antenna is electrically coupled to the card emulation controller;
initiate a polling command wait period; and
adjust a physical property of the antenna in an instance in which the polling command wait period expires and a polling command is not received.