How 60 GHz mmWave Radar Detects Breathing and Presence Without Contact

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Millimeter wave radar can sense human presence, breathing, heart rate, movement, and sleep stages without cameras or wearables. It works by transmitting a continuous 60 GHz frequency-modulated signal and analyzing the reflected echoes for range, velocity, and phase changes. The 60 GHz band's roughly 5 mm wavelength lets it detect chest movements smaller than one millimeter caused by breathing. The technology is positioned as a practical option for homes, elderly care, hotels, and offices, and is compared against PIR sensors, cameras, and wearable devices. Compared with the 24 GHz band, 60 GHz is better suited to breathing and sleep monitoring, while 24 GHz is more suitable for wide-area presence detection.

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