Identification device and identification system
First Claim
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1. A Radio Frequency Identification Device (RFID) comprising:
- a receiver with substantially zero-tuning capacitance configured to receive a first signal for powering the RFID;
a transmitter configured to transmit a second signal;
a state selector configured to randomly or pseudo-randomly cause the RFID to be in one of a first state in which a first amount of current flows through the receiver and a second state in which a second amount of current flows through the receiver, the first amount of current being greater than the second amount of current; and
a voltage rectifier connected to the receiver and configured to draw more current in response to a voltage multiplication factor of the voltage rectifier being increased.
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Abstract
A preferred embodiment of the invention includes: an identification device (1) for receiving a first signal and transmitting a second signal, the device including: a receiving means (35) for receiving the first signal to generate a voltage; an integrated circuit (37) having a state selection means (41) for selecting whether the device (1) is in a. first state or a second state; a connection (39) between the receiving means (35) and the integrated circuit (37); a transmission means (45) for generating the second signal. The invention also includes a. system (50) that includes an interrogator (43) for interrogating a, plurality of the identification devices (1).
41 Citations
28 Claims
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1. A Radio Frequency Identification Device (RFID) comprising:
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a receiver with substantially zero-tuning capacitance configured to receive a first signal for powering the RFID; a transmitter configured to transmit a second signal; a state selector configured to randomly or pseudo-randomly cause the RFID to be in one of a first state in which a first amount of current flows through the receiver and a second state in which a second amount of current flows through the receiver, the first amount of current being greater than the second amount of current; and a voltage rectifier connected to the receiver and configured to draw more current in response to a voltage multiplication factor of the voltage rectifier being increased. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification