The W band of the microwave part of the electromagnetic spectrum ranges from 75 to 110 GHz, wavelength ~2.7-4 mm. It sits above the U.S. IEEE-designated V band (50–75 GHz) in frequency, and overlaps the NATO designated M band (60–100 GHz). The W band is used for satellite communications, millimeter-wave radar research, military radar targeting and tracking applications, and some non-military applications.