The symbol is short for "K-under" originally German : Kurz-untenbecause it is the lower part of the original NATO K bandwhich was split into three bands K uKand K a because of the presence of the atmospheric water vapor resonance peak at K u band is primarily used for satellite communicationsmost notably the downlink used by direct broadcast satellites to broadcast satellite televisionand for specific applications such as NASA 's Tracking Data Relay Satellite used for both space shuttle and International Space Station ISS communications.
K u band satellites are also used for backhauls and particularly for satellite from remote locations back to a television network's studio for editing and broadcasting. 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 transponders20 to watts per transponder, and requiring a 0. The Segments scienze e tecnologie per i media 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 transpondersand even K a band transponders. Other ITU allocations have been made within the K u band to the fixed service microwave towersradio astronomy service, space research service, mobile service, mobile satellite service, radiolocation service radaramateur radio serviceand radionavigation.
However, not all of these services are actually operating in this band and others are only minor users. Compared with C-bandK 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 criterionthe diameter of a parabolic dish required to create a radiation pattern with a given angular beamwidth gain is proportional to the wavelengthand 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.
How to Spot the difference between Ku band and C Band Frequencies
The K u band also offers a user more flexibility.VSAT technology needs a frequency for operation, as any other mobile communication technology. The question is which of them is better and when to use each of them? Here you will find a C band Ku band Comparison. ITU initially defined C-band to be the first satellite band and its frequencies range from 4Ghz to 8Ghz. This range of frequency is also used widely by terrestrial microwave backhaul links nowadays, especially because the sub 6GHz band is free of license in many countries all over the world.
On the other hand, signals in C-band are less focused compared to higher satellite frequencies such as Ku-Band. This is due to the longer wavelength in C Band. Less focused signals means that these signals are less affected by rain a phenomenon known as rain fade of satellite signals.
The attenuation on C-band signal due to rain fading ranges from 0. Moreover, these less focused signals can provide wider range of coverage.
However, these signals need larger dish size e. Unlike C-Band, Ku-band frequencies are dedicated for satellite communication only. This solves the problem of interfering with terrestrial microwave backhaul links. Moreover, Ku-Band is characterized by its high powered signals compared to C-band.
Thus, smaller dishes can be used to achieve the same distance as C-band and the KU band radio transmitter also requires less power. Normally, 0. However, Ku-band is more sensitive to rain fade and the attenuation due to rainfall can be up to 10 dB. Both of them can provide accepted QoS and communication speed. ITU has also introduced higher frequency bands such as Ka-band and X-band, which have lowered the load on C-band. Your email address will not be published. This site uses Akismet to reduce spam.
Learn how your comment data is processed. Azimuth and Elevation 10 February From a commercial point of view, C-band is better for satellite applications that need larger bandwidth.
L/Ku/Ka-band satellites – what does it all mean?
From a commercial point of view, Ku-band is better for satellite applications that need smaller bandwidth, as the equipment is cheaper than C-band. Related posts. Intellian vGX Read more. RicChard says:. Daniel says:. Oche Oche Adama says:. Donovan Moko says:. Wie says:.
Leave a Reply Cancel reply Your email address will not be published.Comparing Ku-band and Ka-band satellite capacity is a high interest topic right now in the satellite industry.
A new study just released sheds new light on this important topic. Ku-band currently dominates the aeronautical mobile satellite systems AMSS broadband market. These Ku-band satellites utilize continental scale wide beams. New Ka-band systems coming onto the market promise to deliver substantially greater throughput than current Ku-band offerings. This fact has led some in the industry to conclude that Ka-band capacity is a superior evolution of Ku-band capacity.
However, this study demonstrates that the superior performance of Ka-band is the result of customized satellites and multiple spot beams.
A Ku-band satellite using similarly sized spot beams can equal or exceed the performance of Ka-band satellites.
All this is not to say that one frequency is better or worse than the other. However, correcting the current misunderstanding of many around the performance characteristics of these frequencies is important. It could provide an evolution path to greater satellite capacity with current Ku-band satellites, thereby avoiding the need for expensive changes to terrestrial infrastructure.
Thank you for reading our blog, SatCom Frontier. If you would like to receive future blogs from us via email, please provide your email address below. You can also read our blogs on Facebook and follow us on Twitter. After submitting your email address, you will be redirected to the subscription service website. Thank you. Select one or more mailing lists:. Back to Blog. SatCom Frontier Blog.Originally published three years ago, this feature on the differences between L- Ku-and Ka-band inflight connectivity systems has been one of our most popular.
It has now been updated with the latest information on the options available. The terms L-band, Ku and Ka satellites are bandied around quite freely.
But do you really know want they mean and the differences between them? This is because Ku is the lower part of the original NATO K band, which was split into three bands Ku, K, and Ka because of the presence of the atmospheric water vapour resonance peak at So what you cry?
Generally, the higher the frequency the more bandwidth you can squeeze out of the system. The difference is just like an FM radio broadcast being compared with medium wave. This still holds true today and is a student essential to understanding satellite throughputs. And the headline bandwidth figure usually refers to the transponder bandwidth from the satellites. Now we need to share that out among the many users. You also have to consider a whole host of other factors, such as how big is your antenna?
What is the elevation of the satellite above the horizon? Yes, weather. Both Ku and Ka can suffer from rain fade Ka more than Ku — this is not usually a problem at 35, feet, but high levels of humidity in tropical areas can also affect signals. Taking L-band first. Inmarsat offers its IP-based kbps SwiftBroadband SBBbut its lightweight kbps SB service, with equipment that can easily be fitted into a bizjet, is also popular.
A newer High Data Rate HDR waveform, can also provide increased data throughput on conventional aircraft — up to kbps using a full kHz bearer — but, again, only in streaming mode. To put a spanner in the works, the satellite thats backs up the new air-to-ground European Aviation Network is S-band — around 2. Its speeds are currently unknown, but expected to be in the Mbps range.
The higher frequencies mean data throughputs in the region of megabits per second Mbps are possible, compared with kbps with the current L-band SwiftBroadband — up to a x speed increase. ViaSat also offers its Ka-band in-flight Exede system, which can deliver up to 12 Mbps to each passenger. Each spot beam has a higher power density, hence the higher bandwidths available.
Both Ka and Ku are also benefitting from new modem designs that promise to boost data throughputs even further.
In fact, both Ku and Ka providers talk about speeds of up to Mbps to the aircraft. The reality is, airlines want good, consistent, reliable connectivity first and foremost. The Ku or Ka argument is becoming secondary. So there you have it. Each band — L, Ku and Ka — works on a different set of frequencies.A satellite frequency type is important to the selection of your LNBf and dish. More often than not, the frequency predetermines the type of dish and LNBf to be used. For one, if you want to track a c-band frequency, you will receive no joy using a Ku band LNB and dish for such.
Additionally, I shall be talking about ways by which you can identify at a glance, the difference between a Ku Band frequency and its, C band counterpart. However, in this context, I shall be limiting myself to Satellite TV reception only. The C band frequency range is 3. The polarity of a C-band frequency usually comes as L or R Although a freq with H or V can also be C-Band so, please check the satellite description to disambiguate And because of the low frequencies, C band waves have longer wavelengths.
You need a C-Band here Since we are talking bigger wavelengths, then a bigger dish is required to receive such frequencies. Prime focus dishes are used to receive C band frequencies. This is the most noticeable difference. Typically, most Ku band frequencies come in H or V polarity. I am yet to see a Ku band frequency description with L or R. The Ku band frequency range is Because of the higher frequencies, Ku band waves have shorter wavelengths.
Shorter wavelengths mean that you need a smaller dish to receive these frequencies. Offset dishes are used to receive Ku band frequencies. The smallest commercially available Offset dish is only 65cm in diameter. Important notice: A free to air decoder like qsat, tiger, strong, gsky and so on can help you pre-determine the frequency types. Now we are going to get into more details about reading frequencies provided by a satellite TV company.
This satellite has both C band and Ku band transponders. You can receive the C band TV stations by installing a 1.
From the above first batch of numbers is the frequency. In this case, it is The next thing that comes is the Polarity either V or H for Ku band and lastly the symbol rate. This is another Frequency that may be provided, in this casea C band frequency:. These are Ku band dish also known as offset dish and prime focus dish known as c band.Forums Search forums. What's new Unread posts Latest posts New profile posts. Members Current visitors Search profile posts.
Jan 14, 6 0.2 feet ki Ku band Dish Ko C band Dish Banaiye Badi Asani se
Sep 26, 4, 41 Los Angeles CA. It depends on who is asking If your a broadcaster and it rains a lot at the uplink location then you will pick C-Band because it is less effected by weather. If you want your customers to have smaller dishes then you will pick the Ku-Band. To pick up Ku-Band you need at least a 31" dish. May 18, 6, 23 Lizella, Georgia Republic. I don't see where either is better than the other.
But, I prefer watching C-Band over ku-Band, because I have a really good Movie Lovers package for my subscription service with my 4dtv.
I use both with different types of receivers, Analog - 4dtv - DVB. Sep 10, 4 Northern USA. Jan 13, 32 0 Albany, NY. I vote C-Band too! You can usually add Ku to C-Band, but not vice versa. A note about C-Band dishes, get at least 7 feet feet is better. You won't really need it for the signal strength, but you will need it to keep out interference from adjacent satellites, which was really noticeable on analog signals on digital, I guess your quality factor goes down.
Nov 23, 2, 1 Montreal, QC. Sadoun SatelliteGuys Pro. If you can put a C-band dish at your house, go fo it. Anole SatelliteGuys Master. Sep 22, 11, 9 L. May 4, 0 Parts Unknown.The Ku-band of the electromagnetic spectrum has been in use for quite sometime, while the capability of the Ka-band has only recently begun to be exploited. But which one of them is better suited for the future of satellite communication? Let's find out. As more of the world migrates towards using wireless technology each day, optimal, high-speed, and reliable wireless connectivity has become the need of the hour.
Would you like to write for us? Well, we're looking for good writers who want to spread the word. Get in touch with us and we'll talk HTS technology boasts an unprecedented bandwidth capability, and is widely viewed as the future of satellite communications. In recent years owing to the explosion in Internet based applications, the demands for higher satellite capacity has skyrocketed.
The capacity of the lower Ku-band of the spectrum is falling short, and investments are now being made in the use of the Ka-band. These bands are not interchangeable, and each has its own advantages and disadvantages, which makes it suitable for one set of applications and unsuitable for another.
In the following sections, we shall examine the differences between Ka-band and Ku-band. But, before that, we shall learn more about the HTS systems. In the High Throughput Satellites system, the coverage area is divided into small regions known as spots.
Each spot is then served by a spot beam. This is unlike the conventional system where one large beam is used to serve the entire area of coverage. This allows these beams to provide high signal strength as well as gain. Thus overall performance is better than that of the conventional system. Newer advanced technology also allows more accurate antennas to be built and thus the spots can be made smaller.
This makes it possible to reuse frequencies multiple times, making HTS satellites more efficient. The Ku band refers to the band of electromagnetic frequencies in the range of GHz. It is located directly below the K-band. This band is mainly used for fixed as well as broadcast satellite communication services.