.The K u band ( ) is the portion of the in the range of frequencies from 12 to 18 (GHz). The symbol is short for 'K-under' (originally: Kurz-unten), because it is the lower part of the original, which was split into three bands (K u, and ) because of the presence of the atmospheric resonance peak at 22.24 GHz, (1.35 cm) which made the center unusable for long range transmission. In radar applications, it ranges from 12-18 according to the formal definition of radar frequency band nomenclature in IEEE Standard 521-2002.K u band is primarily used for, most notably the downlink used by to broadcast, and for specific applications such as 's used for both and (ISS) communications. K u band satellites are also used for and particularly for satellite from remote locations back to a network's studio for editing. The band is split by the (ITU) into multiple segments that vary by geographical region. Was the first television network to uplink a majority of its affiliate feeds via K u band in 1983.Some frequencies in this radio band are employed in used by law enforcement to detect vehicles speeding, especially in Europe.
¥ Robust Ku and Ka-band antenna system ¥ Delivered in one single case for single band operation ¥ Compliant feeds for X, Ku, K-bands are available 75-MANPACK 75 cm, Ku, Ka-Band Antenna terminal KEY BENEFITS TECHNICAL DETAILS Application Ku-band manpack Transceivers RQT Ku-band Horn, OMT and Þlters for optional BUC and LNB. Ku-Band manpack terminal transmits Linear Polarization (Horizontal or Vertical) signals in the 13.75 – 14.5 GHz band Linear Polarization (Vertical or Horizontal) signals in the 10.95 -12.75 GHz band.
One use of the band is. A on a residence, which receives satellite television channels over a K u band microwave beam from a broadcast in a 35,700 kilometres (22,000 miles) above the Earth. The Americas Segments in most of North and South America are represented by 2 from 11.7 to 12.2 GHz ( Frequency (LOF) 10.75 to 11.25 GHz), allocated to the FSS , from 14.0 to 14.5 GHz. There are more than 22 FSS K u band satellites orbiting over North America, each carrying 12 to 48, 20 to 120 per transponder, and requiring a 0.8-m to 1.5-m antenna for clear reception.The 12.2 to 12.7 GHz (LOF 11.25 to 11.75 GHz) segment is allocated to the BSS. BSS (DBS ) normally carry 16 to 32 transponders of 27 bandwidth running at 100 to 240 watts of power, allowing the use of receiver antennas as small as 18 inches (450 mm).Europe and Africa Segments in those regions are represented by ITU Region 1 and they are, the 11.45 to 11.7 and 12.5 to 12.75 GHz bands are allocated to the FSS (, 14.0 to 14.5 GHz).
In Europe K u band is used from 10.7 to 12.75 GHz (LOF Low 9.750 GHz, LOF High 10.750 GHz) for services such as those carried by the satellites. The 11.7 to 12.5 GHz segment is allocated to the BSS.Australia Australia is part of ITU Region 3 and the Australian regulatory environment provides a class license that covers downlinking from 11.70 GHz to 12.75 GHz and uplinking from 14.0 GHz to 14.5 GHz. Indonesia The has categorized as Region P, countries with very high rain precipitation. This statement has made many people unsure about using K u-band (11 – 18 GHz) in Indonesia. If frequencies higher than 10 GHz are used in a heavy rain area, a decrease in communication availability results. This problem can be solved by using an appropriate when designing the wireless communication link.
Higher power can overcome the loss to.Measurements of rain attenuation in Indonesia have been done for satellite communication links in Padang, Cibinong, Surabaya and Bandung. The DAH Model for rain attenuation prediction is valid for Indonesia, in addition to the ITU model. The DAH model has become an ITU recommendation since 2001 (Recommendation No. ITU-R P.618-7). This model can create a 99.7% available link so that K u-band can be applied in Indonesia.The 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, and even transponders.
(NSS 6), launched in December 2002 and positioned at 95° East, contains only K u-band transponders with a footprint on Indonesia (, ). NSS 6 is intended to be replaced by at the same location, which launched in June 2018 and carries 54 K u-band transponders. The satellite, launched in 2004 also uses K u band footprints. Other satellites that provides K u band covers Indonesia are D, 3/3A, ST 2, 11, Koreasat 8/ABS 2 (2nd half 2013), and.Others 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), and radionavigation. However, not all of these services are actually operating in this band and others are only minor users.Advantages Compared with, 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.
URL only available to IEEE members. Note that in the band 11.2–12 GHz the working definitions of K u band and overlap; satellite communications engineers would generally regard frequencies above 11.2 GHz as being part of the K u band. Federal Register of Legislation.
Australian Government. Retrieved 2016-07-06.
Mirabito, M; Morgenstern, B (2004). Satellites: Operations and Applications. The New Communication Technologies (5 ed.). Burlington: Focal Press. 2007-10-23 at the. Martin Chaplin:.
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