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What is the reason for shifting from c band to ku band in satellite communication?

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What is the reason for shifting from c band to ku band in satellite communication?

(a) Lesser attenuation

(b) Less power requirements

(c) More bandwidth

(d) Overcrowding

The question was posed to me by my school principal while I was bunking the class.

The above asked question is from Satellite Communication Systems in portion Satellite Communication of Avionics

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The correct option is (d) Overcrowding

To elaborate: Most new communication satellites will operate in the Ku band. This upward shift in frequency is happening because the C band is overcrowded. Many communication satellites are in orbit now, most of them operating in the C band. However, there is some difficulty with interference because of the heavy usage. The only way this interference will be minimized is to shift all future satellite communication to higher frequencies.

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