Intrusion or movement detector

Details Intrusion or movement detector Intrusion or movement detector

1978-01-18

1980-07-29

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

331 65, 340553, 343 5PD, G08B 1324

Patent

active

042153417

ABSTRACT:
An intrusion or movement detector including an oscillator for generating a radio signal, an antenna for transmitting said radio signal into an area to be surveyed by said detector, said antenna exhibiting a variable radiation resistance relative to the position and movement of objects in the area to be surveyed resulting in a variable loading on said generator when in use, a monitor for monitoring said variable loading and activating a signal or alarm when said variations in loading reach a predetermined threshold level to indicate an intrusion or movement in the area surveyed.

REFERENCES:
patent: Re25100 (1961-12-01), Chapin
patent: 3691556 (1972-12-01), Bloice
patent: 3828335 (1974-08-01), Salmut

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