Inductor/antenna for a recognition system
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United States of America Patent
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Oct 1, 1996
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Feb 8, 1994
priority date (Note) -
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Abstract
An improved inductor/antenna (100)improves the selectivity of a recognition system (10) by ensuring that only the transponder (14) closest to the inductor/antenna (100) of an interrogator (12) receives therefrom, and reacts to, an interrogation signal (S1). The improved inductor/antenna (100) also receives the resulting recognition signal (S2) from the transponder (14) for analysis by the interrogator (12). The inductor/antenna (100) includes two or more coils (102, 104; 124, 126, 128, 130; 132, 134) which may be wound on ferromagnetic cores (108), spaced around a metal mass (46, 48) such as a lock cylinder (46) of an ignition switch (24). The shape, number, location and relative winding sense of the coils are selected to shape and locate the energy field (F; 118, 122) radiated by the inductor/antenna (100) so that only the transponder (14) in a key (26) which is inserted into or operating the ignition switch (24) responds to the interrogation signal (S1) radiated by the inductor/antenna (100).
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