Identification system interrogator
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United States of America Patent
Stats
-
Sep 13, 2005
Grant Date -
May 9, 2002
app pub date -
Oct 22, 2001
filing date -
Jul 20, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An improved interrogator for an inductively coupled identification system is disclosed. The interrogator provides a multidimensional electromagnetic field through a plurality of coils aligned relative to each other. The coils provide a rotating magnetic field having approximately constant amplitude regardless of orientation with respect to the transponder. An additional coil may be utilized to precess the multidimensional electromagnetic field. The interrogator may further provide an impedance matching network that includes a series drive capacitor to match the impedance of a capacitor in parallel with a coil to a driver load impedance.
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