Identification device and identification system
First Claim
Patent Images
1. A Radio Frequency Identification Device (RFID) comprising:
- a receiver configured to receive a first signal and employ the first signal in order to generate a voltage adapted to power the RFID, the receiver including an inductance and substantially zero-tuning capacitance;
a transmitter configured to generate a second signal;
a state selector configured to randomly or pseudo-randomly cause the RFID to be in a first state or a second state,wherein a relatively larger amount of a first current flows through the receiver in the first state, and a relatively smaller amount of the first current flows through the receiver in the second state.
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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).
43 Citations
33 Claims
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1. A Radio Frequency Identification Device (RFID) comprising:
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a receiver configured to receive a first signal and employ the first signal in order to generate a voltage adapted to power the RFID, the receiver including an inductance and substantially zero-tuning capacitance; a transmitter configured to generate a second signal; a state selector configured to randomly or pseudo-randomly cause the RFID to be in a first state or a second state, wherein a relatively larger amount of a first current flows through the receiver in the first state, and a relatively smaller amount of the first current flows through the receiver in the second state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A Radio Frequency Identification Device (RFID) comprising:
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a receiver including a coil with no tuning capacitance configured to receive a first signal; a transmitter configured to generate a second signal; a state selector configured to randomly or pseudo-randomly cause the RFID to be in a first state in which a first current flows through the receiver, or a second state in which a second current flows through the receiver, wherein the first current is greater than the second current. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification