Light wave radar

Millimeter waves are also known as extremely high frequency (EHF). It’s a radio frequency that would allow transmission frequencies between 30 GHz and 300 GHz , compared to 5 GHz frequencies used by previous mobile devices.

Millimeter wave (mmWave) is a special class of radar technology that uses short- wavelength electromagnetic waves . Radar systems transmit electromagnetic wave signals that objects in their path then reflect. By capturing the reflected signal, a radar system can determine the range, velocity and angle of the objects.

Due to atmospheric attenuation, millimeter radars are limited to short-range applications: about 5 km for a 94 GHz transmission . They are particularly useful in bad optical visibility: fog, smoke, dust.