Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2008-05-06
2011-12-06
Walsh, Daniel (Department: 2887)
Registers
Coded record sensors
Particular sensor structure
C235S435000, C235S487000, C235S385000, C340S572700
Reexamination Certificate
active
08070065
ABSTRACT:
A distributed antenna array with a centralized data hub for determining the presence and location of RF tags has been disclosed. This antenna array centralizes electronics and distributes the RF to zones in a facility to greatly reduce the expense of recurring components for monitoring RF tags. A single BRT/hub with multiple antennas attached to transmit and receive ports is used to cover an entire facility. Large facilities are covered by a small number of the BRT/hub combinations. The BRT/hub has transmit antennas coupled thereto, preferably by co-axial cable, that transmit signals to a portion or all of the RF tags and all or a portion of them modulate and reflect the RF signal to a particular receiving antenna. The receiving antenna then returns the RF signal with tag data to the BRT/hub, preferably by co-axial cable. Also disclosed is an RF backscatter tag that cleanly switches a resonant aperture antenna on and off, thereby greatly increasing the mark-to-space ratio of the backscatter data. This enables tags to be detected by the BRT at much greater distances.
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Texas Instruments, UHF Applications Installation Hints, Sep. 2005.
Hardman Gordon E.
Overhultz Gary L.
Pyne John W.
Goliath Solutions, LLC
Jones Day
Walsh Daniel
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