Microwave detectors

Microwave detectors

This device emits microwaves from a transmitter and detects any reflected microwaves or reduction in beam intensity using a receiver. The transmitter and receiver are usually combined inside a single housing (monostatic) for indoor applications, and separate housings (bistatic) for outdoor applications. To reduce false alarms this type of detector is usually combined with a passive infra red detector or "Dualtec" alarm.

By generating energy in the microwave region of the electromagnetic spectrum, detector operates as an active volumetric device that responds to:

* A Doppler shift frequency change.
* A frequency phase shift.
* A motion causing reduction in received energy.