Multi-mode RFID tag architecture
First Claim
1. A multi-mode radio frequency identification (RFID) tag comprises:
- a configurable coupling circuit that, when the multi-mode RFID tag is in a near field mode, provides electromagnetic coupling to an RFID reader and, when the multi-mode RFID tag is in a far field mode, provides radio frequency (RF) coupling to the RFID reader;
a power generating and signal detection module coupled to the configurable coupling circuit, wherein the power generating and signal detection module converts an inbound receive signal into a supply voltage and recovers encoded data from the inbound receive signal;
a baseband processing module coupled to;
decode the encoded data to produce a decoded signal;
process the decoded signal;
when the processing of the decoded signal indicates generating a response signal, generate the response signal; and
encode the response signal to produce outbound encoded data;
a transmit section coupled to the configurable coupling circuit, wherein the transmit section converts the outbound encoded data into an outbound transmit signal.
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Accused Products
Abstract
A multi-mode RFID tag includes a power generating and signal detection module, a baseband processing module, a transmit section, a configurable coupling circuit, and an antenna section. In near field mode, the configurable coupling circuit is operable to couple the transmit section to a coil or inductor in the configurable coupling circuit to transmit an outbound transmit signal using electromagnetic or inductive coupling to an RFID reader. In far field mode, the configurable coupling circuit is operable to couple the transmit section to the antenna section, and the multi-mode RFID tag then utilizes a back-scattering RF technology to transmit the outbound transmit signal to RFID readers.
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Citations
24 Claims
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1. A multi-mode radio frequency identification (RFID) tag comprises:
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a configurable coupling circuit that, when the multi-mode RFID tag is in a near field mode, provides electromagnetic coupling to an RFID reader and, when the multi-mode RFID tag is in a far field mode, provides radio frequency (RF) coupling to the RFID reader; a power generating and signal detection module coupled to the configurable coupling circuit, wherein the power generating and signal detection module converts an inbound receive signal into a supply voltage and recovers encoded data from the inbound receive signal; a baseband processing module coupled to; decode the encoded data to produce a decoded signal; process the decoded signal; when the processing of the decoded signal indicates generating a response signal, generate the response signal; and encode the response signal to produce outbound encoded data; a transmit section coupled to the configurable coupling circuit, wherein the transmit section converts the outbound encoded data into an outbound transmit signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for operating a multi-mode RFID tag, comprising:
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configuring a coupling circuit of the multi-mode RFID tag to provide RF coupling to an RFID reader in far field mode and inductive coupling to an RFID reader in a near field mode;
communicating with the RFID reader in one of the far field mode and the near field mode;
when a command is received from the RFID reader, configuring the coupling circuit to provide the other one of the far field mode and the near field mode;
communicating with the RFID in the other one of the far field mode and the near field mode; andwherein communicating with the RFID reader comprises;
receiving an inbound signal from the RFID reader, recovering an encoded data signal from the inbound signal;
decoding the recovered encoded data signal, wherein the encoded data signal is encoded with a first encoding protocol;
processing the decoded data signal;
generating a response signal to the decoded data signal in response to a command in the decoded data signal that requires a response to the RFID reader;
encoding the response signal with the first encoding protocol. - View Dependent Claims (15, 16, 17)
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18. A radio frequency identification (RFID) tag comprises:
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a configurable coupling circuit operable to provide electromagnetic coupling to a RFID reader in a near field mode and to provide RF coupling to a RFID reader in a far field mode; a power generating and signal detection module coupled to the configurable coupling circuit, wherein the power generating and signal detection module converts an inbound receive signal from the RFID reader into a supply voltage and recovers encoded data from the inbound receive signal in the near field mode and in the far field mode to produce a recovered encoded data signal; a baseband processing module operable to; decode the recovered encoded data signal using a first protocol in when in the far field mode and using a second protocol when in the near field mode to produce a decoded data signal; processing the decoded data signal; generating a response signal to the decoded data signal in accordance with a command in the decoded data signal; and encoding the response signal using the first protocol when in the far field mode and using the second protocol when in the near field mode to produce outbound encoded data; and a transmit section coupled to the configurable coupling circuit, wherein the transmit section converts the outbound encoded data into an outbound transmit signal. - View Dependent Claims (19, 20, 21)
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22. A radio frequency identification (RFID) tag comprises:
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a radio frequency (RF) antenna operable to provide RF coupling in a far field mode; a coil antenna operable to provide electromagnetic coupling in the near field mode; a signal detection module coupled to the RF antenna or to the coil antenna, wherein the signal detection module recovers encoded data from the inbound receive signal to produce a recovered encoded data signal; a baseband processing module operable to; decode the recovered encoded data signal using a first protocol when operating in the far field mode and using a second protocol when operating in the near field mode to produce a decoded data signal; processing the decoded data signal; generating a response signal to the decoded data signal in accordance with a command in the decoded data signal; and encoding the response signal using the first protocol when operating in the far field mode and using the second protocol when operating in the near field mode to produce outbound encoded data; and a transmit section coupled to the RF antenna or to the coil antenna, wherein the transmit section converts the outbound encoded data into an outbound transmit signal. - View Dependent Claims (23, 24)
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Specification