ACTIVE RFID TAG

• US 20090224890A1
• Filed: 03/02/2009
• Published: 09/10/2009
• Est. Priority Date: 03/10/2008
• Status: Abandoned Application

• Current Assignee: LS Industrial Systems Company Limited
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Jong Soo
• Application Number:
  US12/396,367
• Publication Number:
  US 20090224890A1
• Time in Patent Office: Days
• US Class Current: 340/10.330
• CPC Class Codes: G06K 19/0705 the battery being connected to a power saving arrangement
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

An active RFID tag and a method using the same are disclosed, wherein the active RFID tag comprises: an RF signal detecting unit detecting a wake-up signal included in an RF signal; an RF transceiver transmitting a response signal corresponding to the RF signal; and a control unit controlling the RF transceiver and the RF signal detecting unit according to a detected result of the wake-up signal.

Claims

1. An active RFID tag, comprising:

An RF signal detecting unit operated in response to an active signal and to detect an RF signal received through an antenna;

a comparator comparing a signal level of the detected RF signal with a predetermined signal level;

a microprocessor generating the active signal and a switching control signal according to the comparison result of the comparator;

an RF transceiver transmitting a response signal corresponding to the RF signal through the antenna; and

a switching unit connecting the antenna with the RF transceiver or the RF signal detecting unit in response to the switching control signal.

2. The active RFID tag of claim 1, wherein the microprocessor recognizes that the RF signal includes an effective wake-up signal if the signal level of the RF signal is more than a predetermined signal level.

3. The active RFID tag of claim 1, wherein if the RF signal includes command information, the response signal includes RFID tag information corresponding to the command information.

4. The active RFID tag of claim 3, wherein the microprocessor controls the switching unit to connect the antenna with the RF signal detecting unit after the RF transceiver transmits the response signal.

5. The active RFID tag of claim 1, wherein the microprocessor generates the active signal to activate the RF signal detecting unit for a predetermined period at every predetermined time.

6. The active RFID tag of claim 4, wherein the predetermined period is less than 1 ms.

7. The active RFID tag of claim 1, wherein the antenna is connected with the RF signal detecting unit by the switching unit at an initial setting time.

8. An active RFID tag, comprising:

an RF signal detecting unit detecting a wake-up signal included in an RF signal;

an RF transceiver transmitting a response signal corresponding to the RF signal; and

a control unit controlling the RF transceiver and the RF signal detecting unit according to the detected result of the wake-up signal.

9. The active RFID tag of claim 8, further comprising a switching unit transmitting the RF signal received through an antenna to the RF signal detecting unit or the RF transceiver according to control of the control unit.

10. The active RFID tag of claim 9, wherein the control unit controls the switching unit to connect the antenna to the RF transceiver after the wake-up signal is detected.

11. The active RFID tag of claim 10, wherein the control unit controls the switching unit to connect the antenna with the RF signal detecting unit after the RF transceiver transmits the response signal.

12. The active RFID tag of claim 11, wherein the control unit controls the RF signal detecting unit to implement operation for detecting the wake-up signal for a predetermined period which is less than an input period of the RF signal.

13. The active RFID tag of claim 8, further comprising a comparator for comparing a signal level of the detected RF signal with a predetermined signal level to transmit the comparison result to the control unit.

14. An active RFID tag, comprising:

an RF transceiver transmitting a response signal corresponding to an RF signal received through an antenna; and

a sleeping mode escaping unit controlling the RF signal detecting unit to escape from a sleeping mode according to whether a wake-up signal included in the RF signal is detected.

15. The active RFID tag of claim 14, further comprising a switching unit connecting the antenna with the sleeping mode escaping unit or the RF transceiver.

16. The active RFID tag of claim 15, wherein the sleeping mode escaping unit comprises:

a wake-up signal detecting unit to detect the wake-up signal included in the RF signal; and

a control unit controlling the switching unit, the RF transceiver and the wake-up signal detecting unit according to the detected result of the wake-up signal detecting unit.