Exclusive: What is ka band ? - Answer.
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08-01-2015, 10:56 AM
Post: #1
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What is ka band ? - Answer.
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Ka-band has become the band of choice for many satellite operators due to its increasing capacity availability and its applicability for broadband services. New Ka-band satellites are either already in orbit or are being readied for launch. In the past few years we have witnessed a growing amount of Ka-band capacity launched in many regions of the world. Fueled by the growth in Internet-based applications, the demand for satellite capacity has grown similarly to other wireline and wireless communications technologies. The lower Ku-band frequency capacity has filled up in most of the geosynchronous orbital slots. As a result, the growing demand for satellite bandwidth is driving investment in Ka-band as the next choice for launching new satellite capacity. In this paper we will explore the main differences between the Ka and Ku frequency bands, and the corresponding main characteristics of satellite and VSAT technologies. Ka frequencies (~30GHz uplink & ~20GHz downlink) are around twice the frequency used by Ku (~14GHz uplink and ~12GHz downlink). When these high frequencies are transmitted and received in a heavy rain fall area, noticeable signal degradation occurs and is proportional to the amount of rain fall (commonly known as known as “rain fade”). In general, the higher the frequency, the more a signal is susceptible to rain fade. Most of the new Ka-band satellites implement spot-beam technology to reuse the frequency band across the desired coverage area. As opposed to wide beams that cover large territories (e.g. all of Europe), spot beams cover much smaller territories (1/50 – 1/100 of the large territory). In addition, because of the wider spectrum available on Ka-band and the need to support many beams, Ka-band satellites typically implement wideband transponders (300MHz – 600MHz), about tenfold compared with the typical 27MHz to 54MHz Ku-band transponders. This type of implementation combined with advanced VSAT transmission technology results in Ka-band satellites with 10-100 times the throughput that is available on the traditional Ku-band satellites. It’s no wonder that the new generation of Ka-band satellites are referred to as High Throughput Satellites or HTS. |
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The following 2 users Like SENTHIL KUMAR's post: Hemant, Sgokul gp |
08-01-2015, 02:49 PM
Post: #2
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RE: What is ka band ? - Answer.
Thanks for the answer.
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