Selective cloaking circuit for use in a radiofrequency identification and method of cloaking RFID tags
DCFirst Claim
1. An improvement in a cloaked RFID tag having an antenna comprising:
- a switch;
a logic circuit coupled to said switch to selectively allow communication of signals through said antenna during normal operation to allow output of a signal from said RFID tag through said antenna and to disable the output from said RFID during a cloaking period; and
a receiving connection to said RFID tag so that command signals are continuously receivable notwithstanding cloaking of said RFID tag.
3 Assignments
Litigations
1 Petition
Accused Products
Abstract
The output to the antenna of an RFID tag or label is disconnected from the balance of the RFID chip by means of a series switch activated in response to a logic command, CLOAK, generated by the RFID chip. Activation of the switch disconnects the output to the antenna of the RFID tag without disconnecting its input. The output to the antenna is thus disconnected for a time sufficient to allow the remaining RFID tags in an RF interrogation field to be identified. However, the input of the antenna remains connected and is capable of receiving at any time, including during the cloaking period commands which can lift the tag out of cloaking and allow it to then selectively output its signal.
73 Citations
24 Claims
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1. An improvement in a cloaked RFID tag having an antenna comprising:
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a switch;
a logic circuit coupled to said switch to selectively allow communication of signals through said antenna during normal operation to allow output of a signal from said RFID tag through said antenna and to disable the output from said RFID during a cloaking period; and
a receiving connection to said RFID tag so that command signals are continuously receivable notwithstanding cloaking of said RFID tag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An RFID tag comprising:
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an antenna;
an input circuit coupled to said antenna;
a switch controlling said antenna;
a logic circuit coupled to said switch to selectively allow communication of signals through said antenna during normal operation to allow output of a signal from said RFID tag through said antenna and to disable the output from said RFID during a cloaking period; and
a receiving connection to said RFID tag so that command signals are continuously receivable through said antenna by said input circuit notwithstanding cloaking of said RFID tag. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An improvement in a method of controlling a cloakable RFID tag comprising:
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disabling communication of data signals from said RFID tag through said antenna coupled to said RFID tag during cloaking of said RFID tag; and
receiving command signals by said RFID tag through said antenna during said cloaking operation. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification