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Definition: millimeter wave

Electromagnetic waves with a wavelength from one to 10 millimeters, which corresponds to spectrum from 30 to 300 GHz. Millimeter wave applications include communications, radar, radio astronomy and the military. The higher the frequency, the shorter the wavelength, the narrower the beam and the smaller the antennas. Radio astronomy using millimeter waves dates back to the 1960s, and military deployment began in the 1970s. The first consumer usage was radar-based vehicle collision avoidance in the 1990s. See wavelength, microwave, WiGig and WirelessHD.

   FCC Sanctioned Millimeter Wave Bands

   Frequency Range     Licensed

   57-64 GHz  V-band     No

   76-77 GHz  Radar      No

   71-76 GHz  E-band     Yes
   81-86 GHz  E-band     Yes

   92-95 GHz  W-band     Yes