Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Unique identity
Patent
1994-02-08
1995-10-24
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Unique identity
34082531, G01S 1374
Patent
active
054613868
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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Donaldson Richard L.
Hellner Mark
Kesterson James C.
Petersen Bret J.
Texas Instruments Incorporated
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