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L band

The term L-band is used several times for different frequency bands and also for an optical wavelength band. There is the older German designation, the ITU nomenclature, the US American designation and the newer European designation. In the literature, therefore, quite different frequency ranges are given for the L-band.

  1. According to the traditional designation of the International Telecommunication Union (ITU), the frequency range of the L-band is between 1.0 GHz and 2.0 GHz and thus corresponds to the D-band of the NATO nomenclature. This frequency band deals with electromagnetic centimeter waves with wavelengths between 30 cm and 15 cm. The L-band is used for radar applications, and waveguides between 1.12 GHz and 1.7 GHz are also operated in this frequency range. In satellite communications with LEO satellites, for example, the L-band is used to transmit user data from the Iridium satellites to the mobile stations via the downlink. In the Global Positioning System( GPS), the L band is divided into two frequency bands, L1 band and L2 band. The center frequency of the L1 band is 1.57542 GHz, and that of the L2 band is 1.22760 GHz. The L1 band is used for military applications, the signals are encrypted, the L2 band operates unencrypted and is for civilian use.
  2. In addition to the two frequency bands mentioned for the L-band, there are others that deviate from the values mentioned. For example, frequency ranges between 0.39 GHz and 1.55 GHz, but also between 1.53 GHz and 2.7 GHz for satellite radio are mentioned in the literature.
  3. According to the European designation (Nato), the L-band lies between the K-band and the M-band and covers the frequency range between 40 GHz and 60 GHz. The corresponding wavelengths are millimeter waves between 7.5 mm and 5 mm. This frequency range is covered by the V-band in the traditionally designated frequency bands( IEEE).
  4. In optical transmission technology with Coarse Wavelength Division Multiplexing( CWDM), the transmission ranges are defined under ITU-T G.694.2. In the ITU grid, the L-band is located above the C-band in the third telecommunications window and covers the wavelengths between 1,565 nm and 1,625 nm. The channel spacing between the individual wavelengths is 20 nm. Below the L-band is the C-band, above it the U-band (Ultralong).
Informations:
Englisch: L band
Updated at: 22.09.2020
#Words: 353
Links: frequency (f), international telecommunication union (ITU), ultrasonic (US), indium (In), gigahertz (GHz)
Translations: DE
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