Microwave intrusion or movement detectors

Details Microwave intrusion or movement detectors Microwave intrusion or movement detectors

1978-01-31

1980-03-25

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

343 5PD, 343778, 343786, G01S 942, G08B 1318, H01Q 1306

Patent

active

041952898

ABSTRACT:
A microwave movement detector which is capable of discriminating between progressive or unidirectional movement such as that by an unauthorized intruder and reciprocating movement such as by a curtain. The detector includes a pair of receiver/mixer diodes into which a transmitted signal is mixed with a surveying signal causing a phase difference so that the resultant signals have a different phase relationship amplifying the resultant signals feeding the signal into an integrating circuit in similar counter so that an alarm is sounded when the counter reaches a high or low threshold level.

REFERENCES:
patent: 3270339 (1966-08-01), McEuen et al.
patent: 3665443 (1972-05-01), Galvin
patent: 3728721 (1973-04-01), Lee et al.
patent: 3760400 (1973-09-01), Galvin et al.
patent: 3832709 (1974-08-01), Klein et al.
patent: 3845461 (1974-10-01), Foreman
patent: 3942178 (1976-03-01), Hackett
patent: 3947834 (1976-03-01), Gershberg et al.
patent: 4042934 (1977-08-01), Davis

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