Microwave intrusion sensing units and antenna therefor

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

G - Physics

08

B

340/125

G08B 13/24 (2006.01)

Patent

CA 1086400

ABSTRACT OF THE DISCLOSURE 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 positionned 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.

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