G - Physics – 01 – S
Patent
G - Physics
01
S
343/20, 325/44
G01S 13/74 (2006.01) G01S 17/74 (2006.01)
Patent
CA 1242020
ABSTRACT A "passive interrogator label system" (PILS) comprises an interrogator for transmitting an interrogation signal, one or more "labels" or passive transponders which produce a reply signal containing coded information in response to the interrogation signal, and a receiver and decoder for receiving the reply signal and decoding the information contained in it. The frequency of the interrogation signal assumes a plurality of frequency values within a prescribed frequency range. The decoder includes a mixer (4 quadrant multiplexer) for mixing together the interrogation and reply signals (or signals derived therefrom) to produce a further signal containing frequencies which are the sum and difference of the interrogation and reply signals. A signal processor, responsive to this further signal pro- duced by the mixer, detects at least some of the fre- quencies contained in this further signal and determines the informational code associated with the transponder.
465009
Armstrong Donald B.
Nysen Paul A.
Skeie Halvor
Smart & Biggar
X-Cyte Inc.
LandOfFree
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