Identifying system of overlapped tag

Details Identifying system of overlapped tag Identifying system of overlapped tag

2005-01-11

2005-01-11

Lee, Michael G. (Department: 2876)

Registers

Systems controlled by data bearing records

C235S380000, C235S382500, C235S486000, C235S492000, C340S854600, C340S010100

Reexamination Certificate

active

06840440

ABSTRACT:
An identifying system for overlapped tags, wherein one of the tags, e.g., a tag to be appended to an article, has an antenna coil and a radio frequency identification device (RFID) connected to the antenna coil. Two or more resonance capacitors are connected in parallel to each other and in parallel to the antenna coil and two or more switches electrically connect the two or more resonance capacitors to the antenna coil and to the RFID. A control circuit is configured to operate on-off controls of the two or more switches to change a resonance frequency of the identifying system.

REFERENCES:
patent: 5541399 (1996-07-01), de Vall
patent: 5812065 (1998-09-01), Schrott et al.
patent: 6346884 (2002-02-01), Uozumi et al.

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