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Printed Radio Frequency Identification (RFID) Tag Using Tags-Talk-First (TTF) Protocol

  • US 20180225559A1
  • Filed: 03/30/2018
  • Published: 08/09/2018
  • Est. Priority Date: 12/07/2005
  • Status: Abandoned Application
First Claim
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1. A tag configured to wirelessly communicate with a reader in a multi-tag read-capable system using a tags-talk-first (TTF) anti-collision scheme, the tag comprising:

  • a) a memory portion storing a plurality of memory bits, the plurality of memory bits encoding an identifier for the tag, and said memory portion comprising at least one printed layer; and

    b) a circuit configured to (i) transmit a bit string to the reader, said bit string being related to said identifier, (ii) cause said tag to remain silent for a unique silent period following complete transmission of said bit string, said unique silent period being determined by variations in environmental parameters, physical parameters, and/or electrical performance of components within said tag, including variations in said printed layer(s) of the memory portion, and (iii) retransmit said bit string after said unique silent period elapses, wherein said circuit comprises;

    (i) an antenna configured to receive a radio frequency (RF) signal from said reader;

    (ii) a power-up circuit coupled to said antenna, said power-up circuit being configured to provide an enable signal when said RF signal is received by the antenna; and

    (iii) control and readout logic configured to perform control and readout functions of the tag, comprising a plurality of thin film transistors (TFTs).

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