RFID tag detuning
First Claim
Patent Images
1. An RFID tag comprising:
- at least one antenna;
a detuning loop including an open circuit electromagnetically coupled to said antenna; and
means for closing said open circuit, the tag being arranged such that when said circuit is closed said loop detunes the tag sufficiently to prevent it from being read.
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Abstract
An RFID tag is disclosed comprising at least one antenna and a detuning loop including an open circuit electromagnetically coupled to the antenna. The RFID tag also comprises means for closing the open circuit. The tag is arranged such that when the circuit is closed the loop detunes the tag sufficiently to prevent it from being read. A method of detuning an RFID tag is also disclosed.
62 Citations
23 Claims
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1. An RFID tag comprising:
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at least one antenna;
a detuning loop including an open circuit electromagnetically coupled to said antenna; and
means for closing said open circuit, the tag being arranged such that when said circuit is closed said loop detunes the tag sufficiently to prevent it from being read. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An RFID tag comprising:
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at least one antenna;
a detuning loop including a closed circuit electromagnetically coupled to said antenna such that said loop detunes the tag sufficiently to prevent it from being read; and
means for opening said closed circuit to retune the tag. - View Dependent Claims (12)
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13. A method of detuning an RFID tag, said tag including at least one antenna, said method comprising:
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providing a detuning loop including an open circuit such that said loop is electromagnetically coupled to said antenna; and
closing said open circuit such that said loop detunes said tag sufficiently to prevent it from being read. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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- 22. A method of retuning an RFID tag, said tag including at least one antenna and a detuning loop including a closed circuit that is electromagnetically coupled to said antenna such that said loop detunes said tag sufficiently to prevent it from being read, said method comprising a step of opening said closed circuit to retune the tag.
Specification