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The K u band (/ ˌ k eɪ ˈ j uː /) is the portion of the electromagnetic spectrum in the microwave range of frequencies from 12 to 18 gigahertz (GHz). The symbol is short for "K-under" (originally German: Kurz-unten), because it is the lower part of the original NATO K band, which was split into three bands (K u, K, and K a) because of the presence of the atmospheric water vapor resonance ...
Because of the water vapor absorption peak in the center of the band, [1] the IEEE K-band is conventionally divided into three sub-bands: [2] Ku-band (K-under band, 12–18 GHz): mainly used for satellite communications, direct-broadcast satellite television, terrestrial microwave communications, and radar, especially police traffic speed detectors.
2Ku, Gogo's newest technology, uses two Ku-band antennas, one for download and the other for upload. Gogo claims that 2Ku will have peak speeds of 70 Mbit/s and has a low-profile 17 cm (6.69 in) tall radome. [26] Like Ground to Orbit, the Ku-band antennas are manufactured by ThinKom Solutions. [27]
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A number of transponders are used for the hub-to-terminal downlink in the satellite TV downlink segment of the Ku band (10.70 GHz-12.75 GHz). The terminal-to-hub uplink to the satellite uses the uplink segment of the Ku band (14.00 GHz-14.50 GHz) and extended Ku band (13.75 GHz-14.25 GHz)
The signal received by the LNB is extremely weak and it has to be amplified before downconversion. The low-noise amplifier section of the LNB amplifies this weak signal while adding the minimum possible amount of noise to the signal.
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