Hi-link HLK-LD021-5G Radar Sensor Module
The Hi-Link HLK-LD021-5G is a 5.8GHz Doppler radar motion sensor module designed for wide-area motion and presence detection. It provides reliable sensing, wide detection angle, and easy integration for smart lighting, automation, and occupancy systems.
The HLK-LD021-5G name refers to a 5.8 GHz (5G band) Doppler radar motion sensor module manufactured by Hi-Link (Shenzhen Hi-Link Electronic Co., Ltd.). These 5G/5.8 GHz radar modules from Hi-Link use fixed-frequency Doppler radar to detect motion of objects within a sensing zone.
This type of module is not a cellular 5G data modem — the “5G” refers to the 5 GHz/5.8 GHz radar frequency band (microwave radar), not 5G mobile networks.
Core Radar & Sensing Features - Hi-link HLK-LD021-5G Radar Sensor Module
- Operating Frequency: ~5.725 – 5.875 GHz (5.8 GHz ISM radar band) – fixed Doppler radar carrier frequency used for motion detection.
- Detection Principle: Doppler Radar – detects motion by sensing frequency shifts in reflected microwave signals from moving targets.
- Typical Detection Range: Around 3 – 10 m radius (target range varies with installation height and environment).
- Detection Angle: Wide beam (approximately 110° ±10°) for broad area coverage in ceiling-mount configurations.
