Anti-burglar mini-radar

Details Anti-burglar mini-radar Anti-burglar mini-radar

1976-03-26

1978-05-16

Tubbesing, T.H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 7AG, G01S 902

Patent

active

040901955

ABSTRACT:
An anti-interference Doppler effect mini-radar includes a generator of pure microwaves, and a receiver for receiving reflected microwaves and coupled to the generator for detecting and demodulating the transmitted and reflected microwave signals. The demodulated signals are applied to a gain controlled preamplifier, and thence to an adjustable gain amplifier. The output of the adjustable gain amplifier is applied to an alarm control circuit. In order to adjust the gain of the preamplifier a servo-circuit is responsive to the input of the alarm control circuit for applying a gain control voltage to the gain control terminal of the preamplifier. A timing circuit responsive to the output of the adjustable gain amplifier blocks the servo-circuit and inhibits the operation of the alarm control circuit for a determined time following the sudden increase in the output of the adjustable gain amplifier.

REFERENCES:
patent: 3270339 (1966-08-01), McEuen
patent: 3383678 (1968-05-01), Palmer
patent: 3680074 (1972-07-01), Lieser
patent: 3727216 (1973-04-01), Antonio
patent: 3859656 (1975-01-01), Klein et al.
patent: 4003045 (1977-01-01), Stockdale

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