RFID tag having combined battery and passive power source

Details RFID tag having combined battery and passive power source RFID tag having combined battery and passive power source

2005-09-13

2005-09-13

Tran, CongVan (Department: 2683)

Telecommunications

Transmitter and receiver at separate stations

Near field

C455S041200, C340S010100, C340S693100

Reexamination Certificate

active

06944424

ABSTRACT:
An RFID tag is powered both by an internal battery and passively by an interrogating RF field. As a result, the RFID tag can be passively powered after the internal battery has been depleted. More particularly, an embodiment of the RFID tag includes electronic circuitry to provide RFID functionality, and an energy storage device coupled to the electronic circuitry to provide an operational voltage thereto. A battery is operatively coupled to the energy storage device to charge the energy storage device. A rectified RF power source derived from an interrogating RF field is also operatively coupled to the energy storage-device to charge the energy storage device. The rectified RF power source and the battery are electrically separated from each other. The energy storage device remains charged by the battery in the absence of the RF interrogating field while the battery has remaining capacity. After the battery has become depleted, the energy storage device is charged by the presence of the RF interrogating field.

REFERENCES:
patent: 4724427 (1988-02-01), Carroll
patent: 5300875 (1994-04-01), Tuttle
patent: 5552641 (1996-09-01), Fischer et al.
patent: 5850181 (1998-12-01), Heinrich et al.
patent: 6046676 (2000-04-01), Ward et al.
patent: 6243013 (2001-06-01), Duan et al.
patent: 6249227 (2001-06-01), Brady et al.
patent: 6282407 (2001-08-01), Vega et al.
patent: 6329915 (2001-12-01), Brady et al.
patent: 6400274 (2002-06-01), Duan et al.
patent: 6462647 (2002-10-01), Roz
patent: 6476708 (2002-11-01), Johnson
patent: 6593845 (2003-07-01), Friedman et al.
patent: 6690182 (2004-02-01), Kelly et al.
patent: 6720866 (2004-04-01), Sorrells et al.
patent: 2002/0126013 (2002-09-01), Bridgelall

Affiliated with

Also associated with

Rating

RFID tag having combined battery and passive power source does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with RFID tag having combined battery and passive power source, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RFID tag having combined battery and passive power source will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3426429