Anti-theft system for a motor vehicle

Details Anti-theft system for a motor vehicle Anti-theft system for a motor vehicle

1996-11-12

1999-05-18

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

34082569, 235380, 375334, 70277, 342 44, H04Q1/00

Patent

active

059054441

ABSTRACT:
A transceiver with an antenna oscillating circuit generates a magnetic field which inductively charges a charge capacitor of a transponder through a transponder oscillating circuit. A frequency-modulated oscillation is thereupon generated in the transponder and that oscillation is transmitted back to the transceiver. In order to ensure that the transceiver will receive the highest possible amplitudes of the frequency-modulated oscillation, the resonant frequency of the antenna oscillating circuit is adapted to the oscillation frequencies of the transponder oscillating circuit. To that end, an impedance is connected, automatically weighted, to the antenna oscillating circuit.

REFERENCES:
patent: 4546241 (1985-10-01), Walton
patent: 4612509 (1986-09-01), Betts
patent: 4716376 (1987-12-01), Daudelin
patent: 4719460 (1988-01-01), Takeuchi
patent: 4739328 (1988-04-01), Koelle
patent: 4818855 (1989-04-01), Mongeon
patent: 4918955 (1990-04-01), Kimura
patent: 4973958 (1990-11-01), Hirano
patent: 5157247 (1992-10-01), Takahira

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