Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-06-16
1995-05-09
Swarthout, Brent
Communications: electrical
Condition responsive indicating system
Specific condition
327117, 327510, G08B 1314
Patent
active
054144124
ABSTRACT:
In an electronic article surveillance (EAS) system, a frequency-dividing transponder that responds to detection of electromagnetic radiation of a first predetermined frequency by transmitting electromagnetic radiation of a second predetermined frequency that is a frequency-divided quotient of the first predetermined frequency, includes an active strip of amorphous magnetic material having a transverse uniaxial anisotropy defining a magnetomechanical resonant frequency in accordance with the dimensions of the strip at the second predetermined frequency when magnetically biased to be within a predetermined magnetic field intensity range so as to respond to excitation by electromagnetic radiation of the first predetermined frequency by transmitting electromagnetic radiation of the second predetermined frequency; and a tripole strip of magnetic material of such coercivity and so disposed in relation to the active strip of magnetic material as to create a magnetomechanical resonance in the active strip at the first predetermined frequency when the active strip is magnetically biased to be within the predetermined magnetic field intensity range. The transponder may also include a bipolar bias strip of such coercivity and so disposed in relation to the active strip as to cause the active strip to be within the predetermined magnetic field intensity range at which the active strip has magnetomechanical resonance at the first and second predetermined frequencies.
REFERENCES:
patent: 4727360 (1988-02-01), Ferguson et al.
patent: 4882569 (1989-11-01), Dey
patent: 4968972 (1990-11-01), Canipe
Callan Edward W.
Mullen Jr. Thomas J.
Security Tag Systems, Inc.
Swarthout Brent
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