Switchable radiation enhancement and decoupling
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United States of America Patent
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Jun 4, 2013
Grant Date -
Feb 17, 2011
app pub date -
Dec 13, 2007
filing date -
Dec 14, 2006
priority date (Note) -
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Abstract
A device capable of enhancing an electric field to drive an electromagnetic tag into operation is switchable between states to control operation of the tag. Enhancement is provided by a dielectric cavity structure defined between first and second conducting layers. Different states of the device may have different resonant frequencies and read ranges according to the characteristics of the enhancement. As such a container can be provided which includes a tag which switches states on opening, allowing improved tracking characteristics.
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