Efficient object identification system

Details Efficient object identification system Efficient object identification system

G - Physics

01

S

343/19

G01S 13/74 (2006.01) B61L 25/04 (2006.01) G06K 7/00 (2006.01) G07C 9/00 (2006.01) H04B 5/00 (2006.01)

Patent

CA 1160720

ABSTRACT A system for the remote identification of objects using near-field electromagnetic coupling between an interrogator a transponder and a receiver in which a reply carrier at a subharmonic of the interrogation frequency is obtained by regulating, with minimum energy loss and synchronously with the interrogator signal, the energy exchange process between the transponder coupling element and a complementary storage element, and further varying, also with minimum energy loss and synchronously with the resultant oscillation waveform, the said energy exchange process so that the reply carrier becomes modulated with an information bearing code, the modulation rate being not constrained by the transponder tuned circuit bandwidth.

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