Antenna for RF tag with a magnetoelastic resonant core
First Claim
1. A radio frequency identification transponder (RFID tag) comprising:
- RFID tag electronics,an antenna responsive to received radio frequency signals by producing an output signal to the RFID tag electronics, andat least one element of nonlinear magnetic material formed to amplify the output signal presented to the RFID tag electronics.
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Accused Products
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.
117 Citations
21 Claims
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1. A radio frequency identification transponder (RFID tag) comprising:
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RFID tag electronics, an antenna responsive to received radio frequency signals by producing an output signal to the RFID tag electronics, and at least one element of nonlinear magnetic material formed to amplify the output signal presented to the RFID tag electronics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio frequency identification system comprising:
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a base station for communication with one or more RFID tags, a RFID tag, the RFID tag including; RFID tag electronics, an antenna responsive to received radio frequency signals by producing an output signal to the RFID tag electronics, and at least one element of nonlinear magnetic material formed to amplify the output signal presented to the RFID tag electronics. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification