Patent ID: 8587406

Claim:
A radio frequency identification (RFID) tag, comprising: a tag substrate; at least two antennas formed on the substrate; a memory, received by the substrate, for storing RFID data; processing circuitry and modulation circuitries received by the substrate and coupled among the antennas and the memory, wherein the processing circuitry and modulation circuitries are configured to: generate an initial communication; receive at least some of the stored RFID data, and encode the received RFID data using orthogonal frequency division multiplexing (OFDM) to modulate the received data onto two or more orthogonal subcarriers; wherein the processing circuitry and modulation circuitries are further configured to direct at least one antenna of the antennas formed on the substrate to transmit the initial communication to an RFID reader using a non-OFDM communications mode, and wherein the initial communication indicates that the RFID tag is configured to transmit the received RFID data using an OFDM communications mode.