RFID tag containing two tuned circuits
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United States of America Patent
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Oct 26, 2010
Grant Date -
Jan 29, 2009
app pub date -
Jul 5, 2006
filing date -
Jul 28, 2005
priority date (Note) -
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Abstract
An RFID tag is disclosed adapted to be read by an interrogator including a reader antenna having a carrier frequency. The tag includes a first circuit including a first inductor and a first capacitor, wherein the first circuit is tuned to a frequency above the carrier frequency to compensate for detuning in the presence of a plurality of tags. The RFID tag includes a second circuit including a second inductor and a second capacitor wherein the first and second inductors are arranged to be coupled electromagnetically with a coupling factor less than unity and the second circuit is tuned to increase coupling between the first circuit and the reader antenna. A method of reading an RFID tag in the presence of a plurality of tags is also disclosed.
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