Dual transponder radio frequency identification

1. A method for authenticating a radio frequency identification (“RFID”) tag comprising:

receiving a first signal including first data corresponding to a first transponder of the RFID tag;

determining based on the first data included in the first signal whether the first transponder is part of a multi-transponder tag;

in response to determining that the first transponder is not part of a multi-transponder tag, executing a first command;

in response to determining that the first transponder is part of a multi-transponder tag, performing the following:

determining that the first transponder and a second transponder are contained within the RFID tag;

generating an interrogation signal;

receiving a second signal including second data corresponding to the second transponder that is different than the first transponder;

determining whether the second data includes new data that is different from the first data;

determining, using circuitry, whether the second data is associated with the RFID tag based on the first data and the second data; and

executing a second command.

2. The method of claim 1 , wherein the determining whether the second data is associated with the RFID tag based on the first data and the second data comprises:

using the first data as an input to an algorithm; and

comparing an output of the algorithm to the second data.

3. The method of claim 1 , further comprising, in response to determining that the second data is associated with the RFID tag based on the first data and the second data, determining that the RFID tag is a dual-transponder tag.

4. The method of claim 1 , further comprising, in response to determining that the second data is associated with the RFID tag based on the first data and the second data, determining that the first transponder and the second transponder corresponding to the second data are both part of the RFID tag.

5. A RFID reader configured to communicate wirelessly with a radio frequency identification (“RFID”) tag, the RFID reader comprising:

at least one RFID antenna configured to:

receive a first RFID signal including first data corresponding to a first transponder of a RFID tag;

receive a second RFID signal including second data corresponding to a second transponder that is different than the first transponder;

an independent power source; and

processing circuitry configured to:

determine based on the first data included in the first signal whether the first transponder is part of a multi-transponder tag;

in response to determining that the first transponder is not part of a multi-transponder tag, execute a first command; and

in response to determining that the first transponder is part of a multi-transponder tag, (i) determine the first transponder and second transponder are contained within the RFID tag, (ii) generate an interrogation signal to facilitate receipt of the second RFID signal, (iii) determine whether the second data includes new data that is different from the first data, (iv) determine whether the second data is associated with the RFID tag based on the first data and the second data, and (v) execute a second command.

6. The RFID reader of claim 5 , wherein the processing circuitry is configured to, in response to determining that the second data is associated with the RFID tag based on the first data and the second data, determine that the RFID tag is a dual-transponder tag.

7. The RFID reader of claim 5 , wherein the processing circuitry is configured to, in response to determining that the second data is associated with the RFID tag based on the first data and the second data, determine that the first transponder and the second transponder corresponding to the second data are both part of the RFID tag.

8. A method of encoding a radio frequency identification (“RFID”) tag, the method comprising:

communicating with a first transponder included in the RFID tag;

encoding the first transponder with a first transponder identifier corresponding to the first transponder of the RFID tag;

determining whether the first transponder was successfully encoded;

in response to determining that the RFID tag was unsuccessfully encoded identifying the RFID tag as faulty; and

in response to determining that the first transponder was successfully encoded:

communicating with a second transponder included in the RFID tag; and

encoding the second transponder with a second transponder identifier corresponding to the second transponder of the RFID tag.

9. The method of claim 8 , wherein encoding the first transponder includes physically moving the first transponder into a transponder encoding area of a printer-encoder.

10. The method of claim 8 , wherein the first transponder is a far field transponder.

11. The method of claim 8 , wherein communicating with the second transponder comprises communicating with a near field transponder included in the RFID tag.

12. The method of claim 8 , wherein encoding the second transponder included in the RFID tag comprises:

reading information from the first transponder included in the RFID tag;

generating data to be encoded onto the second transponder based on the information read from the first transponder; and

encoding the data onto the second transponder.

13. The method of claim 8 , further comprising:

storing the first transponder identifier as corresponding to a faulty transponder.

14. The method of claim 8 , further comprising:

printing indicia on the RFID tag that indicates the first transponder is faulty.

15. The method of claim 8 , further comprising:

preventing further use or encoding of the second transponder included in the RFD tag.