System for minimizing coupling nulls

Details System for minimizing coupling nulls System for minimizing coupling nulls

2011-06-07

2011-06-07

Lee, Benjamin C (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572100, C343S856000, C343S842000, C343S833000

Reexamination Certificate

active

07956751

ABSTRACT:
A system is disclosed for minimizing coupling nulls between an electromagnetic field derived from one or more sources and a plurality of randomly oriented RFID tags, wherein the electromagnetic field is rotated relative to the tags such that no tag is persistently located in a coupling null relative to the field. The source of the electromagnetic field may include a passive antenna or loop that changes its orientation relative to a direction of movement of the tags. The source of the electromagnetic field may further include an active antenna or loop that is electromagnetically coupled to the passive antenna or loop. A method for minimizing coupling nulls between the electromagnetic field and the randomly oriented tags is also disclosed.

REFERENCES:
patent: 5293172 (1994-03-01), Lamberty et al.
patent: 7477198 (2009-01-01), Kanazawa et al.
patent: 2004/0100413 (2004-05-01), Waldner
patent: 2005/0127177 (2005-06-01), Dearing et al.
patent: WO 2004074873 (2004-09-01), None

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