Method and apparatus for identifying a set of multiple items on conveyor system with multiread transponders
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United States of America Patent
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-
Apr 3, 2007
Grant Date -
Mar 11, 2004
app pub date -
Jun 23, 2003
filing date -
Jun 24, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A three dimensional (3D) radio frequency antenna is positioned on one side of a conveyor which has a movable part for moving items, each of which has a radio frequency transponder, into and out of the antenna such that the items when in the antenna are completely surrounded by the antenna. The 3D antenna includes a plurality of coils which provide a 3D reading field in which all transponders in the reading field may be interrogated and also includes noise compensation coils at opposite ends of the reading field to minimize electromagnetic radiation from the antenna and also minimize noise from external sources. The radio frequency transponder includes a housing, a substrate within the housing, an integrated circuit and a printed circuit board mounted on the substrate. A coil is mounted on the substrate such as to be spaced therefrom with the spacing of the coil from the substrate enabling the encapsulant to completely surround the coil.
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