Mobile wireless communications device including NFC antenna matching control circuit and associated methods
First Claim
Patent Images
1. A mobile wireless communications device comprising:
- a near-field communications (NFC) transceiver configured to generate a received signal strength based on a received signal from an adjacent NFC device;
a plurality of NFC antennas; and
an NFC control circuit comprisingan antenna switch circuit coupled between said NFC transceiver and said plurality of NFC antennas,a capacitance sensing circuit coupled to said plurality of NFC antennas and configured to determine capacitance values thereof, anda processor configured to operate said antenna switch circuit 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.
166 Citations
23 Claims
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1. A mobile wireless communications device comprising:
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a near-field communications (NFC) transceiver configured to generate a received signal strength based on a received signal from an adjacent NFC device; a plurality of NFC antennas; and an NFC control circuit comprising an antenna switch circuit coupled between said NFC transceiver and said plurality of NFC antennas, a capacitance sensing circuit coupled to said plurality of NFC antennas and configured to determine capacitance values thereof, and a processor configured to operate said antenna switch circuit based upon the received signal strength and the capacitance values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A mobile wireless communications device comprising:
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a near-field communications (NFC) transceiver configured to generate a received signal strength based on a received signal from an adjacent NFC device; a plurality of NFC antennas; and an NFC control circuit comprising an antenna switch circuit coupled between said NFC transceiver and said plurality of NFC antennas, a capacitance sensing circuit comprising a plurality of capacitance sensors coupled to said plurality of NFC antennas, and configured to determine capacitance values thereof, and a processor configured to receive a control signal to operate said NFC control circuit in a card emulation mode or in a reader mode, and operate said antenna switch circuit based upon the received signal strength and the capacitance values. - View Dependent Claims (11, 12, 13, 14)
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15. A method for operating a mobile wireless communications device comprising a near-field communications (NFC) transceiver;
- a plurality of NFC antennas; and
an NFC control circuit comprising an antenna switch circuit coupled between the NFC transceiver and plurality of NFC antennas, a capacitance sensing circuit coupled to the plurality of NFC antennas, and a processor coupled to the antenna switch circuit and to the capacitive sensing circuit, the method comprising;generating at the NFC transceiver a received signal strength based on a received signal from an adjacent NFC device; determining capacitance values of the plurality of NFC antennas via a capacitance sensing circuit; and operating the antenna switch circuit via the processor based upon the received signal strength and the capacitive values. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
- a plurality of NFC antennas; and
Specification