Passive device shield with proximity change alert
First Claim
Patent Images
1. A An apparatus comprising:
- a shield for a passive device and a receiver remotely coupled to the shield, the shield being adapted to provide radio frequency shielding to block selected radio frequencies, the shield further comprising a transmitter to send a coupling signal to the receiver, the coupling signal being of at least one non-blocked frequency, the receiver having means to monitor the distance between the receiver and transmitter and an alert means to indicate when the measured distance exceeds a predetermined value at which frequencies the shield is blocking, the selected radio frequencies including an operation frequency of a radio frequency identification tag; and
a radio frequency transmitter fixed to the shield, the transmitter having an operating radio frequency, wherein the shield is not blocking to the operating radio frequency.
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Abstract
A passive device shield 2 used to protect a passive chip containing data embedded in a device from remote skimming at a frequency which activates the chip to send the data, the shield 2 being removable to enable authorized reading of the chip data. The shield 2 is adapted to block the frequencies which activate the chip, the shield 2 further having a transmitter 18 which sends a coupling signal at a non-blocked frequency to a receiver 20, at least one of the receiver/and transmitter 18 having means to monitor the distance between the transmitter 18 and receiver 20 and an alert means to indicate when a predetermined distance has been exceeded.
24 Citations
24 Claims
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1. A An apparatus comprising:
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a shield for a passive device and a receiver remotely coupled to the shield, the shield being adapted to provide radio frequency shielding to block selected radio frequencies, the shield further comprising a transmitter to send a coupling signal to the receiver, the coupling signal being of at least one non-blocked frequency, the receiver having means to monitor the distance between the receiver and transmitter and an alert means to indicate when the measured distance exceeds a predetermined value at which frequencies the shield is blocking, the selected radio frequencies including an operation frequency of a radio frequency identification tag; and a radio frequency transmitter fixed to the shield, the transmitter having an operating radio frequency, wherein the shield is not blocking to the operating radio frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24)
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21. A system comprising:
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a shield for a passive device adapted to provide radio frequency shielding to block selected radio frequencies at which frequencies the shield is blocking, a radio frequency transmitter fixed to the shield and having an operating radio frequency at which the radio frequency transmitter sends a coupling signal, wherein the shield is not blocking to the operating radio frequency, and a receiver that provides an alert when a distance between the radio frequency transmitter and receiver exceeds a predetermined value.
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Specification