Virtual short circuit for providing reference signal in RFID tag
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United States of America Patent
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Mar 17, 2009
Grant Date -
Aug 23, 2007
app pub date -
Dec 14, 2006
filing date -
Dec 14, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
An RFID tag (10) including a virtual short circuit using a stepped impedance transformation from an open circuit or other known impedance point to provide a reference signal to an integrated circuit (22). The stepped impedance transformer (28) does not consist solely of a quarter wavelength transmission line. The stepped impedance transformer (28) may consist of first and second transmission lines (30,32) having different lengths and widths. The RFID tag (10) may also include an impedance matching circuit (20) which does not consist solely of a three-section transmission line. The matching circuit (20) may include a shorting stub transmission line.
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