Switchable active-passive RFID tag

• US 8,451,098 B2
• Filed: 08/05/2007
• Issued: 05/28/2013
• Est. Priority Date: 08/05/2007
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Posamentier, Joshua
• Primary Examiner(s): Zimmerman, Brian
• Assistant Examiner(s): Khan, Omer S
• Application Number:
  US11/833,998
• Publication Number:
  US 20090033463A1
• Time in Patent Office: 2,123 Days
• Field of Search: 340/10.5, 340/10.1, 340/10.3
• US Class Current: 340/10.5
• 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

Abstract

Various embodiments of the invention combine a passive RFID tag with a manually switchable battery for additional transmit range when needed. In some embodiments, connecting the battery may also modify the contents of the data transmitted from the RFID tag. This feature may be particularly useful in applications in which a device generally only needs to identify itself as being in a small area, but may occasionally need to send out an alert with greater range.

Claims

1. An apparatus, comprising:

a radio frequency identification (RFID) tag;

a battery coupled to the RFID tag;

a switch coupled between the RFID tag and the battery to engage an active mode of operation; and

an object coupled to the RFID tag, the battery, and the switch;

wherein the RFID tag is configured to;

operate in a passive mode of operation to identify the object upon an interrogation from an RFID reader by wirelessly sending the RFID reader an identification number of the RFID tag, the identification number including one or more bits set to a first value that indicates that the RFID tag is operating in the passive mode; and

responsive to detecting an alert condition associated with the object, the RFID tag is operable to close the switch to engage the active mode of operation and initiate communication with the RFID reader and wirelessly transmit out an alert to the RFID reader, the alert pertaining to the object and comprising the identification number of the RFID tag which includes the one or more bits set to a second value that indicate that the RFID tag is operating in the active mode;

wherein the RFID tag is configured for a single use of the active mode of operation, wherein the battery is effectively drained in response to closing the switch to engage the active mode of operation, to prevent further uses of the active mode of operation;

wherein the RFID tag is configured for multiple uses of the passive mode of operation, wherein the RFID reader sends the identification number including the one or more bits set to the first value to the RFID reader in response to a passive use of the RFID tag subsequent to the transmission of the alert in the active mode.

2. The apparatus of claim 1, wherein the switch comprises a membrane switch.

3. The apparatus of claim 1, wherein the switch is one of:

a momentary contact switch, a latching switch, or a toggle switch.

4. The apparatus of claim 1, wherein the battery comprises a thick film battery.

5. The apparatus of claim 1, wherein the object is a patient identification bracelet containing the RFID tag, the battery, and the switch.

6. The apparatus of claim 1, wherein the RFID tag is configured to transmit different data in the active mode of operation than in the passive mode of operation.

7. The apparatus of claim 5, wherein the object is configured for attachment to a human patient and wherein the alert condition comprises the human patient pressing a button to switch the RFID tag into the active mode to indicate that the human patient is in distress.