Method and apparatus for determining the direction of...

Details Method and apparatus for determining the direction of... Method and apparatus for determining the direction of...

2006-06-05

2009-10-20

Zimmerman, Brian A (Department: 2612)

Communications: electrical

Selective

Interrogation response

C340S010340, C340S010400, C340S010500, C340S928000, C340S905000, C235S385000, C235S493000

Reexamination Certificate

active

07605684

ABSTRACT:
The disclosed inventions relate to a method and apparatus for creating one-sided interrogation zones. The disclosed inventions further relate to a method and apparatus for determining the direction of movement of tagged items that pass by an RFID reader. The disclosed inventions also relate to a method and apparatus for combining one-sided interrogation zones of two or more antenna arrays to create an interrogation zone that maintains its width over a large range of distances.

REFERENCES:
patent: 5128669 (1992-07-01), Dadds et al.
patent: 5701127 (1997-12-01), Sharpe
patent: 5900825 (1999-05-01), Pressel et al.
patent: 6653946 (2003-11-01), Hassett
patent: 6661352 (2003-12-01), Tiernay et al.
International Search Report for International Application No. PCT/US06/21779 of Feb. 26, 2007.

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