Defining a radio frequency identification read area includes a radio frequency identification (RFID) reader operable to read RFID tags within a specified read area. An RFID transmitter is coupled with the RFID reader and is operable to radiating a modulated carrier in an area adjacent to the specified read area. The RFID reader controls the RFID transmitter to transmit the modulated carrier during a preamble transmission of the RFID reader to prevent any RFID tags in the adjacent area from recognizing an interrogation signal from the RFID reader.

Claims

17 · 2 independent · depth 5

17 granted claims

›1.independentA system for defining a radio frequency identification read area, the system comprising:nat least one radio frequency identification (RFID) reader ope…+15

›2.↳ 1The system of claim 1, wherein the modulated carrier is stopped when the at least one RFID reader is not sending the preamble transmission such that o…d2

›3.↳ 1The system of claim 1, wherein the modulated carrier is sent at a lower frequency than readable carrier frequency for the interrogation signal.d2

›4.↳ 1The system of claim 1, wherein the modulated carrier is sent at a lower power than the interrogations signals of the at least one RFID reader and othe…d2

›5.↳ 1The system of claim 1, wherein the at least one RFID transmitter is time synchronized with the at least one RFID reader.d2+4

›8.↳ 1The system of claim 1, wherein the at least one RFID transmitter also include full RFID reader functionality to interrogate RFID tags normally.d2

›11.↳ 1The system of claim 1, wherein the at least one RFID transmitter is operable to use frequency hopping that is non-synchronized between different RFID …d2

›12.↳ 1The system of claim 1, wherein a location of a tag can be determined by its failure to return an interrogation signal in the adjacent area during the …d2

›13.↳ 1The system of claim 1, wherein a movement of a tag outside of the adjacent area can be determined by its failure to return an interrogation signal in …d2

›14.↳ 1The system of claim 1, wherein a movement of the at least one RFID transmitter is determined by a tag's failure to return the interrogation signal fro…d2

›15.↳ 1The system of claim 1, wherein a location of a tag can be determined by its failure to return the interrogation signal in the adjacent area during the…d2

›16.↳ 1The system of claim 1, wherein the modulated carrier is sent at different antenna polarizations.d2

›17.independentA method for defining a radio frequency identification read area, the method comprising:nproviding at least one radio frequency identification (RFID) …

Classifications

9 codes

IPC · International Patent Classification

Section G — Physics

G06K7/00
G06K7/10

Section H — Electricity

H04Q5/22

USPC · US Patent Classification

340/10.3340/10.1340/539.23340/10.2340/539.1340/572.1

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2.0 y

733 days filing → grant

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Benjamin Lee

art unit 2684 · TC 2600

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Citations: 29 back · 2 forward

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Type	Document	Date
related publication	US 20140313015 A1	23 Oct 2014

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