Communications: electrical – Selective – Having indication or alarm
Patent
1984-07-23
1987-01-20
Rowland, James L.
Communications: electrical
Selective
Having indication or alarm
180287, 307 10AT, 340553, B60R 2500, G08B 1318
Patent
active
046382941
ABSTRACT:
In an unauthorized entry detection system for automotive vehicles, an oscillator is installed within the passenger compartment of the vehicle to generate an electromagnetic wave with a predetermined frequency defined by the interior size of the compartment, a first antenna connected to the oscillator to propagate the electromagnetic wave in the whole interior of the compartment in such a manner that the compartment resonates as a cavity resonator when all the doors and windows are closed, a second antenna arranged within the compartment to generate an induced voltage in response to the magnetic field component of the propagated electromagnetic wave, and a detecting circuit connected to the second antenna to detect a change of the induced voltage level caused by entry of a human body into the compartment and/or opening of the doors or windows, thereby to generate a detection signal therefrom.
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Henney, "Cavity Resonators", Radio Engineering Handbook, fifth edition, pp. 46-49 (chapter 6), 1959.
Mullen Jr. Thomas J.
Nippondenso Co. Ltd.
Rowland James L.
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