Piezo-based circuit for modifying functionality of RFID tags
AssigneeHand Held Products, Inc.
InventorsSridhar Ravilla, Kailash Kashyap Godawarthy, Pankaj Kumar Pandey
Life of this patent
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Abstract
A radio frequency identification (RFID) tag comprising a tag integrated circuit (IC), an antenna coupled to the tag IC, and an impedance tuned circuit coupled to the antenna, wherein the impedance tuned circuit configured to tune a circuit impedance of the antenna based on power received by the impedance tuned circuit. The RFID tag further comprises a piezo electric energy harvesting module coupled to the impedance tuned circuit, wherein the piezo electric energy harvesting module is configured to supply the power to the impedance tuned circuit.
Claims13
A radio frequency identification (RFID) tag comprising:
- a tag integrated circuit (IC), wherein the tag IC comprises a functional impedance;
- an antenna coupled to the tag IC;
- an impedance tuned circuit coupled to the antenna via a latching switch;
- and
- a piezo electric energy harvesting module coupled to the impedance tuned circuit via the latching switch, wherein the piezo electric energy harvesting module actuates the latching switch based on a movement of the RFID tag to electrically connect the impedance tuned circuit to the antenna, wherein in an instance in which the impedance tuned circuit is electrically coupled to the antenna, the impedance of a combination of the impedance tuned circuit and the antenna matches the impedance of the tag IC such that radio frequency (RF) signals are transmitted and received via the antenna.
A radio frequency identification (RFID) tag comprising:
- an antenna configured to receive and transmit radio frequency (RF) signals;
- a tag integrated circuit (IC) coupled to the antenna, the tag IC comprising an input/output (I/O) port, and the tag IC is configured to generate discrete signals for transmission in the RF signals based on electric signals received on the I/O port;
- and
- a piezo electric energy harvesting module coupled to the I/O port of the tag IC via a latching switch, wherein the piezo electric energy harvesting module actuates the latching switch based on a movement of the RFID tag to generate the electric signals to the I/O port of the tag IC such that the RF signals are transmitted and received via the antenna.
Dependencies are inferred from the claim text.