Dual frequency RFID circuit

Details Dual frequency RFID circuit Dual frequency RFID circuit

2007-03-05

2010-11-30

Nguyen, Hung T. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572100, C340S010100, C340S010300, C235S492000

Reexamination Certificate

active

07843345

ABSTRACT:
A radio frequency identification (RFID) transponder (FIGS.4and5A) is disclosed. The transponder includes first (RF) and second (GND) terminals. A first resonant circuit (500, 504, 508) is connected between the first and second terminals. A second resonant circuit (502, 504, 508) has a second resonant frequency different from the first resonant frequency and is connected between the first and second terminals.

REFERENCES:
patent: 4160971 (1979-07-01), Jones et al.
patent: 5680106 (1997-10-01), Schrott et al.
patent: 5712630 (1998-01-01), Nanboku et al.
patent: 6445271 (2002-09-01), Johnson
patent: 2001/0011948 (2001-08-01), Rasband
patent: 2004/0104809 (2004-06-01), Rizzo et al.

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