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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 peak at K u band is primarily used for satellite communications , most notably the downlink used by direct broadcast satellites to broadcast satellite television , and for specific applications such as NASA 's Tracking Data Relay Satellite used for International Space Station ISS communications and SpaceX Starlink satellites.
The band is split by the International Telecommunication Union ITU into multiple segments that vary by geographical region.
NBC was the first television network to uplink a majority of its affiliate feeds via K u band in Some frequencies in this radio band are employed in radar guns used by law enforcement to detect vehicles speeding, especially in Europe.
There are more than 22 FSS K u band satellites orbiting over North America, each carrying 12 to 48 transponders , 20 to watts per transponder, and requiring a 0.
The Segments in those regions are represented by ITU Region 1, and they are the In Europe K u band is used from Australia is part of ITU Region 3 and the Australian regulatory environment provides a class license that covers downlinking from This statement has made many people unsure about using K u -band 11 — 18 GHz in Indonesia.
Using frequencies higher than 10 GHz in a heavy rain area usually gives poor results. This problem can be solved by using an appropriate link budget when designing the wireless communication link.
Higher power can overcome the loss to rain fade. Measurements of rain attenuation in Indonesia have been done for satellite communication links in Padang, Cibinong, Surabaya and Bandung.
ITU-R P. This model can create a Use of the K u -band for satellite communications in tropical regions like Indonesia is becoming more frequent.
Several satellites above Indonesia have K u -band transponders , and even K a band transponders.
Other ITU allocations have been made within the K u band to the fixed service microwave towers , radio astronomy service, space research service, mobile service, mobile satellite service, radiolocation service radar , amateur radio service , and radionavigation.
However, not all of these services are actually operating in this band and others are only minor users. Compared with C-band , K u band is not similarly restricted in power to avoid interference with terrestrial microwave systems, and the power of its uplinks and downlinks can be increased.
This higher power also translates into smaller receiving dishes and points out a generalization between a satellite's transmission and a dish's size.
As the power increases, the size of an antenna's dish will decrease. A major attraction of the band over lower frequency microwave bands is that the shorter wavelengths allow sufficient angular resolution to separate the signals of different communication satellites to be achieved with smaller terrestrial parabolic antennas.
From the Rayleigh criterion , the diameter of a parabolic dish required to create a radiation pattern with a given angular beamwidth gain is proportional to the wavelength , and thus inversely proportional to the frequency.
Note the inverse linear correlation between dish size and frequency. As power levels on both C and K u band satellites have increased over the years, dish beam-width has become much more critical than gain.
The K u band also offers a user more flexibility. A smaller dish size and a K u band system's freedom from terrestrial operations simplifies finding a suitable dish site.
For the end users K u band is generally cheaper and enables smaller antennas both because of the higher frequency and a more focused beam. There are, however, some disadvantages of K u band system.
Therefore, the K u band satellites typically require considerably more power to transmit than the C-band satellites.
Another weather-caused degradation called "snow fade" is not specific to the K u band. It is due to snow or ice accumulation on a dish significantly altering its focal point.
The satellite operator's Earth Station antenna requires more accurate position control when operating at K u band due to its much narrower beam focus compared to C band for a dish of a given size.
Position feedback accuracies are higher and the antenna may require a closed loop control system to maintain position under wind loading of the dish surface.
From Wikipedia, the free encyclopedia.