ELECTRONIC SENSORS


Introduction to Microwave Motion Sensor Modules


24 GHz microwave motion sensor modules are advanced radar-based sensors designed for precise motion detection in a variety of applications.


U


nlike traditional passive infrared (PIR) sensors, which rely on heat signatures, these modules use Doppler radar technology to detect movement by emitting high-frequency microwave signals and  them to detect motion through walls, glass and other non-metallic barriers, making them highly versatile for security systems,  Operating at 24 GHz like the NJR4267 in the image on the left, these sensors offer improved accuracy, longer detection range and minimal interference compared to lower-frequency alternatives like 10 GHz   monitoring and even gesture recognition  compact design and low power consumption  


 operate based on the Doppler effect, a fundamental principle in wave physics that describes how the frequency of a wave changes when the source or observer is  motion sensors, the module emits continuous   the frequency remains unchanged and no   frequency increases, creating a positive  away, the frequency decreases, resulting in  transmitted and received frequencies, the sensor can accurately determine whether motion is occurring, the speed of the moving 


The Rise of 60 GHz Microwave Sensors


   sensors that primarily detect movement, these high-frequency radar sensors are


24 FEBRUARY 2025 | ELECTRONICS FOR ENGINEERS


designed to identify the presence of  micro-movements, such as breathing or slight body shifts, making them perfect for  GHz sensors is their high spatial resolution, allowing for detailed detection even in   where presence detection can be used to     without being affected by environmental    sunlight, whereas 60 GHz radar remains highly   applications in patient monitoring, particularly   movements such as chest rise and fall


during breathing makes them valuable for non-contact health monitoring, reducing the  can improve security and privacy in sensitive areas, as they do not rely on cameras or visual imaging but instead use electromagnetic   and immunity to environmental interferences, 60 GHz sensors are rapidly transforming  for smart automation and non-intrusive monitoring solutions continues to grow, these sensors are set to play a crucial role in  


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46