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Why are VHF, UHF, and microwave signals used in satellite communication?

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Why are VHF, UHF, and microwave signals used in satellite communication?

(a) More bandwidth

(b) More spectrum space

(c) Are not diffracted by the ionosphere

(d) Economically viable

I got this question during an online exam.

Origin of the question is Satellite Communication Systems topic in section Satellite Communication of Avionics

1 Answer

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Best answer
Right answer is (c) Are not diffracted by the ionosphere

The explanation is: VHF, UHF, and microwave signals penetrate the ionosphere with little or no attenuation and are not refracted to earth. Lower frequencies undergo total internal refraction and get reflected back to earth.

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