Load isolated article surveillance system and antenna assembly

Details Load isolated article surveillance system and antenna assembly Load isolated article surveillance system and antenna assembly

1988-07-29

1992-06-09

Eisenzopf, Reinhard J.

Communications: electrical

Condition responsive indicating system

Specific condition

340572, 340584, G08B 1324

Patent

active

051211033

ABSTRACT:
An electronic theft detection system with a transmitter antenna assembly which includes a flat electrically conductive panel positioned close to a transmitter loop antenna to preload it and isolate it from the loading effects of nearby metal objects and a receiver arranged with a signal gate synchronized to the transmitter antenna energization to prevent detection of targets located on the opposite side of the panel from the transmitter loop antenna.

REFERENCES:
patent: 3763424 (1973-10-01), Bennett, Jr. et al.
patent: 4308530 (1981-12-01), Kip et al.
patent: 4509039 (1985-04-01), Dowdle
patent: 4623877 (1986-11-01), Buckens
patent: 4769631 (1988-09-01), Copeland
patent: 4859991 (1989-08-01), Watkins et al.

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