SYSTEM AND METHOD OF DETECTING ITEMS IDENTIFIED BY RADIO FREQUENCY IDENTIFICATION (RFID) TAGS IN A SMART SHOPPING CART
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United States of America Patent
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N/A
Issued Date -
Jun 23, 2016
app pub date -
Dec 18, 2014
filing date -
Dec 18, 2014
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A smart shopping cart includes a basket having an open top, a plurality of electrically conductive side walls, and an electrically conductive bottom wall. Unidirectional, near-field, side antenna elements are mounted on, and electrically grounded to, the side walls. Each side antenna element radiates an electromagnetic field in an inward direction toward an interior of the basket. A near-field, bottom antenna element is mounted on, and electrically grounded to, the bottom wall, and radiates an electromagnetic field in an upward direction toward the interior of the basket. A cart controller excites all the antenna elements to create a composite, resonant electromagnetic field substantially within the basket with substantially no electromagnetic field leakage exteriorly past the side walls, and detects entry and exit of RFID-tagged items through the open top of the basket into and out of the resonant electromagnetic field.
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