Antenna apparatus for an electronic security system

Details Antenna apparatus for an electronic security system Antenna apparatus for an electronic security system

1973-11-14

1976-02-10

Safourek, Benedict V.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340258C, 343180, H04B 148

Patent

active

039380440

ABSTRACT:
For use in an electronic security system wherein a resonant tag circuit is sensed to denote an alarm condition, an antenna system which senses the presence of a resonant tag circuit and, upon such sensing, can automatically activate a deactivation field for destruction of the resonant properties of the tag circuit at its sensing frequency and provide an output indication that tag deactivation has been achieved. The antenna system includes a high Q resonant loop antenna for providing a deactivation field, and a coplanar sensing loop antenna isolated from the sensing circuitry during operation of the deactivation antenna.

REFERENCES:
patent: 3227954 (1966-01-01), Fichter, Jr.;
patent: 3624631 (1971-11-01), Chomet et al.
patent: 3820103 (1974-06-01), Fearon

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