RADIO FREQUENCY IDENTIFICATION TRANSPONDER
First Claim
Patent Images
1. A radio-frequency identification (“
- RFID”
) interrogator for interrogating a plurality of RFID transponders, the RFID interrogator including;
a transmitter for providing a plurality of temporally spaced interrogating signals, wherein the each of the plurality of temporally spaced signals includes a respective identifier;
a receiver for receiving response signals from the plurality of RFID transponders, the response signals including respective identity data derived from at least one of the plurality of temporally spaced interrogating signals; and
a signal processor responsive to the receiver for extracting identity data from the response signals to determine an order in which the transponders were first in receipt of an interrogating signal.
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Accused Products
Abstract
A radio frequency identification transponder including a power supply and a dynamic memory array which stores data. When power from the power supply ceases, the data in the dynamic memory array is validly maintained for a predetermined period of time. The dynamic memory array is responsive to an interrogating signal for selectively updating the data. A signal processor extracts an identifier from the interrogation signal and is responsive to the identifier and the stored data to determine whether some or all of the identifier is stored in the dynamic memory array.
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Citations
17 Claims
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1. A radio-frequency identification (“
- RFID”
) interrogator for interrogating a plurality of RFID transponders, the RFID interrogator including;
a transmitter for providing a plurality of temporally spaced interrogating signals, wherein the each of the plurality of temporally spaced signals includes a respective identifier;
a receiver for receiving response signals from the plurality of RFID transponders, the response signals including respective identity data derived from at least one of the plurality of temporally spaced interrogating signals; and
a signal processor responsive to the receiver for extracting identity data from the response signals to determine an order in which the transponders were first in receipt of an interrogating signal. - View Dependent Claims (2)
- RFID”
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3. A method of interrogating a plurality of radio-frequency identification (“
- RFID”
) transponders with an RFID interrogator, the method including the steps of;
providing a plurality of temporally spaced interrogating signals to the plurality of RFID transponders, wherein the interrogating signals include respective identifiers;
receiving response signals from respective RFID transponders of the plurality of RFID transponders with a receiver, the response signals including respective identity data derived from at least one of the interrogating signals; and
being responsive to the receiver for extracting the identity data from the response signals to determine an order in which the RFID transponders were first in receipt of an interrogating signal.
- RFID”
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4. A plurality of radio-frequency identification (“
- RFID”
) transponders for use with an RFID interrogator that provides a plurality of temporally spaced interrogating signals that include respective identifiers, each of the plurality of transponders including;
a receiver for receiving at least one of the interrogating signals;
a signal processor responsive to the receiver for identifier extraction; and
a transmitter responsive to an identifier for transmitting a response signal for allowing the RFID interrogator to determine an order in which the plurality of transponders were first in receipt of an interrogating signal. - View Dependent Claims (5, 6, 7, 8, 9, 10)
- RFID”
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11. A method of using a plurality of radio-frequency identification (“
- RFID”
) transponders with an RFID interrogator that provides a plurality of temporally spaced interrogating signals that include respective identifiers, the method including the steps of;
the RFID transponders receiving at least one of the plurality of temporally spaced interrogating signals with respective receivers;
being responsive to the respective receivers for extracting the identifiers from the at least one of the plurality of temporally spaced interrogating signals; and
transmitting respective response signals in response to the identifiers for allowing the interrogator to determine the order in which the plurality of RFID transponders were first in receipt of an interrogating signal.
- RFID”
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12. A baggage handling system for baggage tagged with respective radio-frequency identification (“
- RFID”
) transponders, the system including;
an RFID interrogator that transmits a plurality of temporally spaced interrogating signals into an interrogating space;
wherein the signals include respective identifiers;
a conveyer for sequentially progressing the baggage through the interrogating space;
a receiver for receiving response signals from the transponders;
wherein the response signals include identity data derived from at least one of the plurality of temporally spaced interrogating signals; and
a signal processor responsive to the receiver for extracting the identity data from the response signals for determining an order in which the baggage is progressed through the interrogating space. - View Dependent Claims (13)
- RFID”
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14. A method of handling baggage tagged with respective radio-frequency identification (“
- RFID”
) transponders, the method including the steps of;
transmitting, by an RFID interrogator, a plurality of temporally spaced interrogating signals into an interrogating space;
wherein each of the plurality of temporally spaced interrogating signals includes a respective identifier;
sequentially progressing the baggage through the interrogating space;
receiving, by a receiver, response signals from the transponders;
wherein the response signals include identity data derived from at least one of the plurality of temporally spaced interrogating signals; and
being responsive to the receiver for extracting the identity data from the response signals for determining an order in which the baggage is progressed through the interrogating space. - View Dependent Claims (15, 16, 17)
- RFID”
Specification