G - Physics – 08 – B
Patent
G - Physics
08
B
G08B 13/22 (2006.01) G06K 7/10 (2006.01) G08B 13/24 (2006.01)
Patent
CA 2100614
ABSTRACT An electromagnetic detection system comprising at least one source circuit and at least one source circuit-controlled antenna configuration, which comprises two loop antenna coils, substantially located in one plane or in closely spaced parallel planes, for generating a detection field in a detection zone, and a plurality of responders, provided with a loop antenna coil, detectable in the detection zone by means of the detection field, wherein one loop antenna coil of the antenna configuration is part of a series resonance circuit, and that the other loop antenna coil is part of a parallel resonance circuit, the series and parallel resonance circuits having the same resonance frequency and being interconnected to form a combined antenna network connected to the source circuit, and the series and parallel resonance circuits being dimensioned such that the frequency-dependent parts of the impedances substantially compensate each other, so that the combined antenna network has a substantially frequency-independent impedance.
Macrae & Co.
N. V. Nederlandsche Apparatenfabriek Nedap
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