Microwave intrusion sensing units and antenna therefor

Details Microwave intrusion sensing units and antenna therefor Microwave intrusion sensing units and antenna therefor

1977-02-16

1978-10-10

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

343786, G08B 1324

Patent

active

041199510

ABSTRACT:
An improved sensing unit for installation in a room to be monitored by a microwave intrusion detection system. The sensing unit comprises an omnidirectional microwave antenna made of a rectangular waveguide having a shaped aperture defined by cutting the free end of the waveguide at an angle from each short side wall. A scattering blade is positioned centrally between the pointed ends of the wide side walls thus formed.
The antenna is coupled to a transceiver whose output signal is applied to a sensitivity control serially connected to a filtering amplifier. The amplified output signal is fed to a level detector whose output is applied to a triggering signal generator through a delay circuit which inhibits signals of insufficient duration.

REFERENCES:
patent: 3553702 (1971-01-01), Spanos
patent: 3680074 (1972-07-01), Lieser
patent: 3754254 (1973-08-01), Jinman
patent: 3886549 (1975-05-01), Cheal et al.

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