Printed radio frequency identification (RFID) tag using tags-talk-first (TTF) protocol
First Claim
1. A tag configured to wirelessly communicate with a reader, the tag comprising:
- a) a memory portion having an identifier, said memory portion comprising at least one printed layer; and
b) a circuit configured to provide a bit string followed by a predetermined, unique silent period, said bit string being related to said identifier.
3 Assignments
0 Petitions
Accused Products
Abstract
A method, algorithm, architecture, circuits, and/or systems for EAS, HF, UHF, and RFID designs suitable for multi-tag read applications using TTF anti-collision schemes are disclosed. In one embodiment, a tag for wirelessly communicating with a reader can include: (i) a memory portion with an identifier, the memory having at least one printed layer; and (ii) a circuit for providing a bit string followed by a predetermined silent period, where the bit string is related to the identifier. The tag can include pre-programmed memory bits (e.g., bits the value of which is programmed by printing), or alternatively, memory bits formed by conventional photolithography, but having connections made using printing technology to form the identifier, for example. A unique identifier for each tag or device used in a system under a given set of operating conditions can allow a reader to distinguish between them based on a length and/or value of a bit string, for example. Embodiments of the present invention can advantageously provide a reliable and simplified approach for multi-tag read capable EAS, HF, UHF, and RFID systems using TTF anti-collision schemes.
55 Citations
29 Claims
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1. A tag configured to wirelessly communicate with a reader, the tag comprising:
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a) a memory portion having an identifier, said memory portion comprising at least one printed layer; and
b) a circuit configured to provide a bit string followed by a predetermined, unique silent period, said bit string being related to said identifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 19)
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15. A method of making a tag, comprising the steps of:
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a) using at least one printed layer to form a memory portion having an identifier; and
b) forming a circuit for providing a bit string followed by a unique silent period, said bit string being related to said identifier. - View Dependent Claims (16, 17, 18)
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20. A wireless identification system, comprising:
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a) a first tag having a first identifier programmed therein using printing technology, said first tag being configured to transmit a first bit string and remain silent for a first period of time when an electromagnetic field is applied, wherein said first bit string and/or said first period of time has a length and/or value that is determined by an algorithm based on said first identifier;
b) a second tag having a second identifier programmed therein using printing technology, said second tag being configured to transmit a second bit string and remain silent for a second period of time when said electromagnetic field is applied, wherein said second bit string and/or said second period of time has a length and/or value is determined by said algorithm based on said second identifier; and
c) a reader configured to receive and distinguish between said first and second tags based on said first and second lengths and/or values. - View Dependent Claims (21, 22)
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23. A group of tags configured to communicate wirelessly with a reader, each tag in the group comprising:
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a) a first a memory portion having an identifier, said memory portion comprising at least one printed layer; and
b) a circuit configured to provide a bit string followed by a predetermined, unique silent period, said bit string being related to said identifier. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification