G - Physics – 01 – N
Patent
G - Physics
01
N
340/124.3
G01N 27/72 (2006.01) G01S 7/02 (2006.01) G01S 13/76 (2006.01) G06K 7/10 (2006.01) H01Q 7/00 (2006.01) H01Q 21/24 (2006.01)
Patent
CA 1248606
ABSTRACT Transponder Systems In a transponder system where a central interrogator transmits an electromagnetic field over an area in which transponders carried by moving objects are to be detected, the interrogator includes two coplanar antennae one arranged as a loop and the other in a figure of eight configuration, in order to generate fields at right angles to one another so that transponders can be detected regardless of their orientation. A phase shift may be introduced between the fields in order to generate a circularly polarized field.
498217
Curtis Stephen P.
Jordan Gary V.
Senelco Limited
Sim & Mcburney
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