Efficient object identification system

Details Efficient object identification system Efficient object identification system

1981-09-08

1982-12-14

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340 38L, 343 68R, H04Q 900

Patent

active

043640435

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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patent: 3964024 (1976-06-01), Hutton et al.
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patent: 4114151 (1978-09-01), Denne et al.
patent: 4129855 (1978-12-01), Rodrian
patent: 4196418 (1980-04-01), Kip et al.
patent: 4314373 (1982-02-01), Sellers

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