System for minimizing coupling nulls within an electromagnetic field
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United States of America Patent
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Issued Date -
Jul 20, 2006
app pub date -
Feb 13, 2004
filing date -
Feb 18, 2003
priority date (Note) -
Abandoned
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Abstract
A system is disclosed for avoiding and/or minimizing coupling nulls between an electromagnetic field derived from one or more sources and a plurality of randomly oriented RFID tags. The plurality of tags is arranged to move relative to the filed such that no tag is persistently located in a coupling null relative to the field. The or each tag may be translated and/or rotated relative to the electromagnetic field. Alternatively, the electromagnetic field may be translated and/or rotated relative to the tags. In a further aspect coupling nulls may be avoided by orienting a main axis of the or each source of electromagnetic radiation obliquely relative to a direction of movement of the plurality of tags.
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