 These detectors use high frequency radio waves (micro waves) to
detect movement. The micro wave energy will penetrate and pass through all building
construction materials like wood, sheet rock, cinder block, plastic, glass and brick and
is reflected by metal. Because microwave energy will penetrate, application and
installation requires careful consideration. Microwave has much greater range than
ultrasonic. Basically, such a detector emits high frequency waves that form a pattern
after getting reflected or absorbed by different objects in the vicinity. If there is any
movement in the vicinity then the pattern changes and the same is then used for Receiver
unit to detect the intrusion. The Receiver, in turn gives input to the control panel to
trigger the alarm.
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