Antenna system and method for reading low frequency tags
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United States of America Patent
Stats
-
Jun 15, 2004
Grant Date -
N/A
app pub date -
Jul 24, 2001
filing date -
Aug 10, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A reader reads identifiers from tags on pallets conveyed past the reader. The reader includes two interleaved linear arrays of antennas with circularly polarized fields. Each antenna is composed of a pair of crossed rods phased to have adjacent antennas of an array generate circularly polarized fields of opposite rotation. The vector components of the polarization in the direction across the width of the conveyor have peaks and nulls, and the interleaved arrays are arranged such that the nulls of one array's fields are covered with the peaks of the other array's fields. This arrangement allows the reader to the identifier from the tag when the tag is at any orientation. A tag at the side of the reader is aligned in the direction of travel by rails on the conveyor. The reader has antennas aligned in the direction of travel to read such tags.
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