Patent ID: 9646239
Date: 2017-05-09
CPC Classifications: G06K

Claim:
1. An identification tag, comprising: tag circuitry comprising an activation signal threshold detector capable of detecting at least two activation signal thresholds associated with an activation signal; an inductive antenna including two terminals connected to tag circuitry; and a non-volatile memory configured to store full-duplex identification data and half-duplex identification data; wherein the inductive antenna forms a resonant antenna circuit tuned to resonate at the frequency of the activation signal; wherein the tag circuitry is configured to be powered by electric current induced in the resonant circuit; and wherein the tag circuitry is configured to respond to interrogation cycles that include intervals during which an activation signal is present and intervals during which the activation signal is absent; wherein the tad circuitry is configured to: wherein the activation signal threshold detector determines when the tag circuitry transmits full-duplex identification data and half duplex identification data (1) within a single interrogation cycle and (2) when the activation signal is sufficiently strong to power both the full-duplex transmission and the half-duplex transmission; wherein when the activation signal threshold detector determines that the activation signal is insufficient to power both full-duplex and half-duplex transmissions, the tag circuitry reverts to a transitory alternate transmission mode until the activation signal strength changes; wherein an interrogation cycle comprises an interval when the activation signal is present and an interval when the activation signal is absent.