Identification system interrogator

Details Identification system interrogator Identification system interrogator

2005-09-13

2005-09-13

Crosland, Donnie L. (Department: 2636)

Communications: electrical

Condition responsive indicating system

With particular system function

C340S505000, C340S572100, C340S572700, C340S010100

Reexamination Certificate

active

06943680

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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