Portable, batteryless, frequency divider consisting of inductor

Details Portable, batteryless, frequency divider consisting of inductor Portable, batteryless, frequency divider consisting of inductor

1985-11-04

1987-06-02

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

343895, 363159, H02M 520, G08B 1318

Patent

active

046707409

ABSTRACT:
A batteryless, portable, frequency divider consists of a single resonant circuit consisting of an inductor and a diode. The resonant circuit detects electromagnetic radiation at a first predetermined frequency and responds to said detection by transmitting electromagnetic radiation at a second frequency that is one-half of the first frequency. The circuit is resonant at the second frequency when the voltage across the diode is zero. The frequency divider is utilized in a presence detection system that uses a tag containing the frequency divider. The system transmits electromagnetic radiation at the first frequency into a surveillance zone, and detects the second frequency to detect the presence of the tag in the surveillance zone.

REFERENCES:
patent: 4431965 (1984-02-01), Aslan
patent: 4481428 (1984-11-01), Charlot, Jr.
patent: 4609911 (1986-09-01), Nourse et al.

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