Millimeter wave

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Millimeter waves are electromagnetic waves with a wavelength mm of about 1-10, which corresponds to a frequency of 300-30 Giga hertz corresponds.

This frequency band is also known as the EHF band, where EHF stands for Extremely High Frequency .

Millimeter waves are used in the military as radar waves (e.g. in helicopters and night vision devices looking through walls ), in building surveillance areas (as hidden motion detectors ), for radar-based ACC adaptive cruise control systems in the frequency range between 76 and 77 GHz and for body scanners . The new WLAN standard IEEE 802.11ad also transmits at 60 GHz in the millimeter wave range and thus enables gigabit data rates. Millimeter waves in the FR2 frequency range are used in the 5G mobile communications standard .

See also

Web links

  • Copied from the bat. On: Wissenschaft.de of October 15, 2005. With a sensor for millimeter waves, security guards can locate objects under the clothing of flight passengers.