Method and apparatus for enhancing detection of electronic artic

Details Method and apparatus for enhancing detection of electronic artic Method and apparatus for enhancing detection of electronic artic

1990-08-09

1992-04-28

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

343895, G08B 1314, H01Q 136

Patent

active

051092174

ABSTRACT:
A method for detection of EAS tags in a surveillance area into which an electrostatic field is propagated and in which an electronically conductive object is present, includes a step of providing a tag reradiator configuration which is unaffected by close proximity to the object. The step is practiced by configuring the tag reradiator as a first part of a monopole, the object being used as a further part of the monopole, and by disposing the first monopole part beyond the outside perimeter of the conductive environment. The tag reradiator is further configured to define a part of a dipole, the object being used as a further part of the dipole. In an alternative practice, the tag reradiator includes a ground plane member and itself defines such monopole and dipole. In the former practice, the tag reradiator is electrically connected with the object. In the latter practice, the tag reradiator is affixed to the object in electrical isolation therefrom.

REFERENCES:
patent: 3895368 (1975-07-01), Gordon et al.
patent: 4139844 (1979-02-01), Reeder
patent: 4642640 (1987-02-01), Woolsey et al.
patent: 4736207 (1988-04-01), Siikarla et al.
patent: 4866424 (1989-09-01), Parks
patent: 5030940 (1991-07-01), Siikarla

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