Dual antenna coil transponder system

Details Dual antenna coil transponder system Dual antenna coil transponder system

2002-11-01

2008-03-25

Hess, Daniel (Department: 2876)

Registers

Records

Conductive

C340S505000, C340S010100, C340S572100

Reexamination Certificate

active

07347379

ABSTRACT:
The present invention relates to a dual antenna coil identification system, and more particularly, to an interrogator or reader for inductively coupling to a transponder and thereby extract data from the transponder. The magnetic field required to energize a transponder is generated by currents flowing through two essentially identical but opposite phased antenna coils arranged near the area where tags are to be read.

REFERENCES:
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patent: 4542532 (1985-09-01), McQuilkin
patent: 4673943 (1987-06-01), Hannan
patent: 5227803 (1993-07-01), O'Connor
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patent: 5455575 (1995-10-01), Schuermann
patent: 5491715 (1996-02-01), Flaxl
patent: 6023610 (2000-02-01), Wood, Jr.
patent: 6236315 (2001-05-01), Helms et al.
patent: 6307468 (2001-10-01), Ward, Jr.
patent: 6483427 (2002-11-01), Werb

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