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RFID TAGS FOR ENABLING BATCH READING OF STACKS OF CARTONS
[January 24, 2006]

RFID TAGS FOR ENABLING BATCH READING OF STACKS OF CARTONS

(PCT Biblio Info Via Thomson Dialog NewsEdge)Pub. Number WO2006002280
Appl. Data US05022151 20050621
Applicant AVERY DENNISON CORPORATION
Inventor(s) FORSTER, Ian, James
Title RFID TAGS FOR ENABLING BATCH READING OF STACKS OF CARTONS
Abstract A radio-frequency identification (RFID) system including an RFID
tag and an RFID -enabled object. The RFID tag may include a pair of antennas
(122A & 122B)and an R FID circuit (124). The antennas receive activation energy
from a reader (106), and the RFID circuit modulates tag energy when activation
energy (E) is received by one of the antennas. The tag may also include a
transmission line(126) for opera tively coupling the RFID circuit to the
antennas. A first one of the antennas ma y receive activation energy which, in
turn, may be radiated by a second one of t he antennas. The second antenna may
also receive tag energy radiated by an anten na of another RFID tag. The
received tag energy may then be radiated by the first antenna. Accordingly,
when a plurality of the RFID tags are positioned in sequ ence in operative
proximity with each other, activation energy may be propagated through the
sequence from one RFID taA radio-frequency identification (RFID) sy stem
including an RFID tag and an RFID-enabled object. The RFID tag may include a
pair of antennas and an RFID circuit. The antennas receive activation energy
from a reader, and the RFID circuit modulates tag energy when activation energy
s received by one of the antennas. The tag may also include a transmission line
for operatively coupling the RFID circuit to the antennas. A first one of the
an tennas may receive activation energy which, in turn, may be radiated by a
second one of the antennas. The second antenna may also receive tag energy
radiated by an antenna of another RFID tag. The received tag energy may then be
radiated by the first antenna. Accordingly, when a plurality of the RFID tags
are positioned in sequence in operative proximity with each other, activation
energy may be propagated through the sequence from one RFID tag to another in
one direction, an tag energy may be propagated through the sequence from one
RFID tag to another r in another direction. When a plurality of tags are
mounted to a plurality of o bjects, the now RFID-enabled objects can be read in
batch, including the innermo st objects in a stack and objects that may be
blocked by an RF obstacle. The RFI tags are oriented on the objects so that
when the objects are stacked together the RFID tags are sequentially positioned
in operative proximity with each other. Therefore, energy from a reader that is
received by, e.g., an uppermost to is propagated through the sequence tag by
tag in one direction. In addition, tag energy modulated by the RFID circuit of
each of the tags is propagated through the sequence tag by tag in the other
direction. This two-dimensional propagation enables the RFID circuit of each
tag of the RFID-enabled objects in the stack t be excited and to be read by the
reader.

If you would like to purchase a copy of this patent, please call MicroPatent at 800-648-6787.

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