E band

The designation E-band occurs in the European frequency band nomenclature, but not in the older German nomenclature. In addition, the designation E-band is used for waveguides and also for optical wavelength systems.

1. For the designations of the frequency bands, the nomenclature must always be observed. There is the traditional nomenclature from IEEE and the European one from NATO. The designation E-band only occurs in the NATO nomenclature in combination with the F-band as E/F-band and identifies the frequency range between 2 GHz and 4 GHz, whereby the E-band covers the range up to 3 GHz and the F-band that up to 4 GHz. This frequency band roughly corresponds to the S band in the older German nomenclature. The resulting wavelengths are between 15 cm and 7.5 cm. The E/ F band is subject to higher attenuation compared to the frequency bands below it. The E/F band is used, among other things, for military radar systems with pulse powers of 20 MW.
2. The E band also occurs in waveguides and is also used in 5th generation( 5G) mobile communications systems. These are millimeter waves in the frequency range between 60 GHz and 90 GHz. The wavelengths are between 5 mm and 3.3 mm. 5G involves the frequency ranges from 71 GHz to 76 GHz and from 81 GHz to 86 GHz.
3. For optical transmission technology, the International Telecommunication Union( ITU) has defined six wavelength bands with the ITU grid.
   

   Wavelength bands according to ITU recommendation G.694.2

   These lie between 1,260 nm and 1,675 nm. The E-band (extended) lies between the O-band and the S-band with wavelengths between 1,360 nm and 1,460 nm. It consists of five wavelengths with a spacing of 20 nm. Below the E-band is the O-band, above it the C-band (Conventional).