Multiple frequency theft detection system

Details Multiple frequency theft detection system Multiple frequency theft detection system

1988-04-05

1989-09-26

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, 343868, G08B 1314, H01Q 700

Patent

active

048703915

ABSTRACT:
A swept frequency theft detection system for detecting different resonant circuit targets which are resonant at different frequencies. The system comprises arrangements to generate swept frequency transmitter signals centered at different frequencies but which are swept in synchronism. Also provided are antennas formed by offset loops, with the loops of different frequency antennas lying along different diagonal lines.

REFERENCES:
patent: 3182315 (1965-05-01), Sweeney
patent: 3500373 (1970-03-01), Minasy
patent: 4023167 (1977-05-01), Wahlstron
patent: 4135183 (1979-01-01), Heltemes
patent: 4135184 (1979-01-01), Pruzick
patent: 4274090 (1981-06-01), Cooper
patent: 4321586 (1982-03-01), Cooper et al.
patent: 4623877 (1986-11-01), Buckens

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