Multibit tag with stepwise variable frequencies

Details Multibit tag with stepwise variable frequencies Multibit tag with stepwise variable frequencies

1995-10-27

1997-10-21

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

34082554, 342 44, 342 51, G08B 1314

Patent

active

056801068

ABSTRACT:
A transponder is disclosed comprising a resonant RLC circuit with one or more components that can be connected or disconnected non-destructively using switches that respond to an externally applied magnetic field. The switching in or out of the components causes a change in the resonant frequency of the original RLC circuit that is detected by the base station sweeping a carrier signal through a range of frequencies to detect a returned signal that changes when the carrier signal frequency matches the resonant frequency of the resonant circuit/tag. The resonant frequency changes when one or more of the circuit components is connected or disconnected. Each switch transfers at a unique magnetic field intensity so that electrical contact is achieved at a predetermined value of an externally applied magnetic field. The detected changes are used to create a code that is used to pass information from the resonant circuit/tag to the base station.

REFERENCES:
patent: 3500373 (1970-03-01), Minasy
patent: 4745401 (1988-05-01), Montean
patent: 5081445 (1992-01-01), Gill et al.
patent: 5103210 (1992-04-01), Rode et al.
patent: 5111186 (1992-05-01), Narlow et al.
patent: 5218189 (1993-06-01), Hutchison
patent: 5257009 (1993-10-01), Narlow
patent: 5446447 (1995-08-01), Carney et al.
patent: 5450086 (1995-09-01), Kaiser

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