Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-05-11
2000-10-10
Lee, Benjamin C.
Communications: electrical
Condition responsive indicating system
Specific condition
3405722, 3405727, G08B 1314
Patent
active
061306126
ABSTRACT:
A radio frequency identification transponder (RFID tag) includes an RFID antenna and one or more elements of nonlinear magnetic material tuned to resonate at substantially the same frequency as the resonant frequency of the tag antenna. This co-resonance amplifies signals that impinge upon the antenna, yielding both a higher level signal from the antenna to the tag electronics and wider operational bandwidth for the tag. With the addition of the nonlinear magnetic material, the tag may also be employed as a magnetic surveillance tag, with the attendant non-screening capabilities. With a plurality of nonlinear magnetic elements tuned to different resonant frequencies, the tag may provide more "non-screenable" information, that is, two bits, or four binary states, for example, when two such elements are employed.
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Castellano Anthony
Heinrich Harley Kent
Schrott Alejandro Gabriel
von Gutfeld Robert Jacob
Intermec IP Corp.
Lee Benjamin C.
Trieu Van T.
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