RFID tag systems, RFID tags and RFID processes with branch node indexing
First Claim
Patent Images
1. A radio frequency identification tag comprising:
- a radio frequency receiver;
a processor coupled to the receiver;
a frequency generator coupled to the processor and configured to provide a signal at one of at least three different subcarrier frequencies in response to commands from the processor; and
a transmitter coupled to the frequency generator and configured to transmit the signal from the frequency generator.
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Abstract
A radio frequency identification tag is disclosed that is configured to transmit a signal modulated with one of more than two different subcarrier modulation frequencies such that the signal represents more than one binary bit as a single symbol.
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Citations
44 Claims
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1. A radio frequency identification tag comprising:
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a radio frequency receiver;
a processor coupled to the receiver;
a frequency generator coupled to the processor and configured to provide a signal at one of at least three different subcarrier frequencies in response to commands from the processor; and
a transmitter coupled to the frequency generator and configured to transmit the signal from the frequency generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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- 10. A radio frequency identification tag configured to transmit a signal modulated with one of more than two different subcarrier modulation frequencies such that the signal represents more than one binary bit as a single symbol.
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20. An interrogation unit comprising:
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a transmitter;
a processor coupled to the transmitter;
a memory coupled to the processor and configured to store operating code modules, identification indicia corresponding to each of a plurality of tags and status information describing the plurality of tags; and
a receiver capable of simultaneously receiving and decoding information from more than two different signals. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. A process for singulating a tag in a population of tags organized into a binary tree structure, comprising:
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transmitting a signal indicative of a target path segment in the binary tree; and
receiving, in response to transmitting, one or more return signals each modulated with one of more than two subcarrier frequencies. - View Dependent Claims (29, 30)
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- 31. A process for singulating a tag in a population of tags organized into a binary tree structure, comprising transmitting a signal indicative of a target path segment encompassing more than one node in the binary tree.
- 38. In a radio frequency identification tag, a process of traversing a tag population organized into a binary tree structure, comprising receiving a signal including information specifying a target path segment encompassing more than one node in the binary tree.
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40. An apparatus for singulating a tag in a population of tags organized into a binary tree structure, comprising:
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means for transmitting a signal indicative of a target path segment in the binary tree; and
means for receiving, in response to transmitting, one or more return signals each modulated with one of more than two subcarrier frequencies. - View Dependent Claims (41, 42)
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- 43. In an RFID tag, an apparatus for traversing a tag population organized into a binary tree structure, comprising receiving a signal including information specifying a target path segment encompassing more than one node in the binary tree.
Specification