W band

The International Telecommunication Union(ITU) has specified the frequency range for the W-band between 75 GHz and 110 GHz.

The frequency range is used for microwave technology and radar technology. The wavelength range is between 4 mm and 2.7 mm. In radar technology according to the NATO nomenclature, the W-band roughly corresponds to the M-band, which ranges from 60 GHz to 100 GHz.

In this frequency range, the transmitted signals are strongly attenuated by the molecular scattering of air molecules. At 75 GHz, the attenuation due to humidity is relatively high, but it decreases up to frequencies of 95 GHz. The frequency ranges mentioned are used, among other things, for long-range radars in automotive technology.