Mobile wireless communications device including NFC antenna matching control circuit and associated methods
First Claim
Patent Images
1. 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.
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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.
168 Citations
22 Claims
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1. An electronic device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A mobile wireless communications device comprising:
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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. - View Dependent Claims (10, 11, 12, 13, 14)
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15. 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:
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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. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification