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US 9,189,725 B2Granted
Activation and indication of an RF field on a device including a chip
AssigneeUint
InventorsPhilippe Blot, Didier Mobetie, Jean-Charles Renaud
Life of this patent
Estimating the term…
Abstract
A device includes a main antenna suitable for capturing and transmitting an RF signal, at least one chip containing information and configured to transmit the information via the main antenna in response to an excitation of an external RF signal, and a mechanism for activating and deactivating the main antenna. The device further includes a detection circuit for detecting the presence of the external RF signal, and an indicator circuit, which is connected to the detection circuit so as to indicate the presence.
Claims17
A device comprising:
- a main antenna suitable for capturing and transmitting a radio frequency signal called RF signal,
- at least one chip containing information and configured for transmitting this information via the main antenna in response to an excitation of an external RF signal, and
- a mechanism for activating and deactivating the main antenna by selectively connecting and disconnecting an interrupted link between the main antenna and the at least one chip;
- a detection circuit for detecting the presence of the external RF signal, and
- an indicator circuit, connected to the detection circuit, so as to indicate said presence,
- the activation and deactivation mechanism and the detection circuit are arranged so that the activation and deactivation mechanism only activates the main antenna on the double condition that the indicator circuit receives an activation instruction from a user and that the detection circuit reports the presence of the external RF signal to the indicator circuit.
3 more elements
Dependencies are inferred from the claim text.