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Wiki(digital microwave sensor)
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The 10.525GHz microwave motion sensor utilizes the Doppler effect to detect moving objects through microwaves. It distinguishes itself from regular infrared (IR) sensors as microwaves are sensitive to a diverse range of reflective objects. Moreover, its sensor readings remain unaffected by ambient temperature variations.
This type of microwave sensor finds extensive applications in industrial, transportation, and civil domains. Its uses include measuring vehicle speed, monitoring liquid levels, automatic door motion detection, facilitating automatic washing, material detection in production lines, and functioning as car reversing sensors, among other applications.
The microwave detection method has the following advantages compared to other methods:

Non-contact detection
Readings not affected by temperature, humidity, noise, air, dust or light – suitable for harsh environments
Strong resistance to radio frequency interference
Low output, unharmful to human
Wide detection range and high velocity
Supports non-living object detection

Applications

The microwave sensor can be useful together with other sensors to enhance its measurement accuracy. For example,Microwave sensorcould decrease the pseudo fault report rate of human motion detection. And it does a good job in safety & security work.

Key Features

Working Voltage: 5V + 0.25V
Working Current (CW): 60mA max., 37mA typical
Interface: Gravity 3-Pin interfaceDigital
Size: 48.5x63mm
Emission parameters:

Detection Distance: 2-16M continuously adjustable
Emission Frequency: 10.525 GHz
Precision Frequency Setting: 3MHz
Output Power (minimum): 13dBm EIRP
Harmonic Emission: < -10dBm Average Current (5%DC): 2mA typ. Pulse Width (Min.): 5uSec Load Cycle (Min.): 1% Reception Parameters: Sensitivity:(10dB S/N ratio) 3Hz to 80Hz Bandwidth: -86dBm 3Hz to 80Hz Bandwidth Clutter: 10uV Antenna Gain: 8dBi Vertical 3dB Beam Width: 36 degrees Level 3dB Beam Width: 72 degrees Package List Microwave Sensor x1 Digital Sensor Cablex1