Mobile wireless communications device including NFC antenna matching control circuit and associated methods
AssigneeBlackBerry Limited
InventorsLizhong Zhu, Libo Zhu, Robert Michael Philip Gondosch, Craig Stuart Mackenzie
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Abstract
A mobile wireless communications device includes a near-field communications (NFC) transceiver, NFC antennas and an NFC control circuit. The NFC transceiver generates a received signal strength based on a received signal from an adjacent NFC device. The NFC control circuit includes an antenna switch circuit coupled between the NFC transceiver and the NFC antennas. A capacitance sensing circuit is coupled to the NFC antennas to determine capacitance values thereof. A processor operates the antenna switch circuit based upon the received signal strength and the capacitance values.
Claims22
An electronic device comprising:
- a near-field communications (NFC) transceiver that generates a received signal strength based on a received signal from an adjacent NFC device;
- a plurality of NFC antennas;
- a capacitance sensing circuit coupled to said plurality of NFC antennas and that determines capacitance values thereof;
- and
- an antenna switch circuit coupled between said NFC transceiver and said plurality of NFC antennas and that operates based upon the received signal strength and the capacitance values.
A mobile wireless communications device comprising:
- a near-field communications (NFC) transceiver that generates a received signal strength based on a received signal from an adjacent NFC device;
- a plurality of NFC antennas;
- a respective capacitance sensor associated with each of said plurality of NFC antennas and that determines capacitance values thereof;
- and
- an antenna switch circuit coupled between said NFC transceiver and said plurality of NFC antennas and that operates based upon the received signal strength and the capacitance values.
A method for operating an electronic device comprising a near-field communications (NFC) transceiver, a plurality of NFC antennas, a capacitance sensing circuit coupled to the plurality of NFC antennas, and an antenna switch circuit coupled between the NFC transceiver and plurality of NFC antennas, the method comprising:
- operating the NFC transceiver to generate a received signal strength based on a received signal from an adjacent NFC device;
- operating the capacitance sensing circuit to determine capacitance values of the plurality of NFC antennas;
- and
- operating the antenna switch circuit based upon the received signal strength and the capacitive values.
Dependencies are inferred from the claim text.