Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-04-04
2006-04-04
Hofsass, Jeffery (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S572100, C340S572700, C340S010100, C343S7000MS, C343S842000, C455S041300, C455S502000, C455S503000
Reexamination Certificate
active
07023346
ABSTRACT:
A system for minimizing the effect of null zones in an interrogation zone of a marker detection system. The system includes a reference antenna system configured to produce a first reference electromagnetic field during a first time period. The antenna system also includes a phase canceling antenna system configured to produce a second electromagnetic field substantially in phase with the reference electromagnetic field during the first time period and a third electromagnetic field substantially out of phase with the reference electromagnetic field during the first time period. The phasing of the first field or the second and third fields may be continuously switched while the phase of the other is held constant. A method of spatially shifting null zones in an interrogation zone of a marker detection system is also provided.
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Balch Brent F.
Hurd William H.
O'Connell John
Spalding Tom
Hofsass Jeffery
Pham Lam
Sensormatic Electronics Corporation
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