What advantage do microwave sensors have over infrared sensors?

Microwave sensors have the advantage of being able to penetrate some types of walls, which allows them to detect motion or objects behind obstacles that would hinder infrared sensors. This penetrating ability is due to the longer wavelength of microwave signals compared to infrared radiation. While infrared sensors rely on detecting heat signatures and require a clear line of sight, microwave sensors can effectively cover areas that include obstructions, making them useful in various applications where line-of-sight detection is not feasible.

The primary function of microwave sensors relies on changes in the frequency of the microwave signals caused by moving objects, resulting in a strong capacity to detect intrusions even in complex environments. This capability enhances their effectiveness in security applications where traditional infrared systems may fail.