Proximity detecting apparatus

Details Proximity detecting apparatus Proximity detecting apparatus

1989-12-18

1992-03-24

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

235440, G08B 1314

Patent

active

050992279

ABSTRACT:
A proximity detection system which combines the advantages of an electrostatic (electric) field coupling mechanism with those of an electromagnetic coupling mechanism in order to overcome the disadvantages of the respective individual coupling mechanisms. The system includes a coded tag which is excited with an induction field, i.e., by using an electromagnetic coupling mechanism as has been done in the past in such proximity identification systems, but which transmits stored data back to the receiver using both an electric field coupling mechanism and an electromagnetic field coupling mechanism. The receiver, in turn, is provided with a novel preamplifier circuit arrangement, so that it can simultaneously receive signals via either or both of these coupling mechanisms.

REFERENCES:
patent: 3707711 (1972-12-01), Cole et al.
patent: 3895368 (1975-07-01), Gordon et al.
patent: 4818855 (1989-04-01), Mongeon et al.

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