RFID tag with improved range
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United States of America Patent
Stats
-
May 20, 2008
Grant Date -
May 3, 2007
app pub date -
Oct 29, 2005
filing date -
Oct 29, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An RFID tag having an rfid integrated circuit and an antenna is combined with a first passive antenna circuit to provide an extended operating range. The first passive antenna circuit has a first coil and a first capacitor to tune the passive antenna circuit to a resonant frequency the same as the operating frequency of the RFID tag. The first coil has a central opening larger than the size of the antenna. The passive antenna circuit is arranged with the antenna located in the central opening of the coil, preferably in a co-planar manner, to promote inductive interaction therebetween. A second passive antenna circuit essentially identical to the first, but having larger dimensions, is positioned with the coil of the second passive antenna circuit surrounding the first coil to extend the operating range even further.
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