Description
mmWave radar operates in the 30–300 GHz band — typically 60 GHz (consumer Wi-Fi-band radar like Soli) or 77 GHz (automotive-derived TI / NXP chips). Short wavelengths give very fine range and angle resolution, and chest-wall vital-sign sensitivity unmatched by sub-6 GHz CSI. The trade-off is short coverage and severe wall attenuation, which makes mmWave radar a complementary modality to WiFi-CSI rather than a replacement.
When it's used
- High-resolution gesture / micro-movement sensing
- Vehicle-cabin occupancy and vital-sign monitoring
- Single-room high-resolution HAR
- Reference for CSI sensing accuracy benchmarks
Limitations
- Severe attenuation through walls and furniture
- Coverage limited to a few metres
- Cost vs commodity Wi-Fi