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Which radio-frequency band is most commonly used by satellites for communication at present?

Difficulty: Easy

Correct Answer: SHF (Super High Frequency)

Explanation:


Introduction / Context:
Satellite communication relies on specific frequency bands to ensure clear transmission, minimize interference, and optimize bandwidth. The SHF band (3 GHz to 30 GHz) is widely used for most modern satellites.


Given Data / Assumptions:

  • EHF: above 30 GHz, limited by atmospheric attenuation.
  • UHF/VHF: too low frequency, limited bandwidth, and large antenna requirements.
  • SHF: includes C-band, Ku-band, and Ka-band commonly used by satellites.


Concept / Approach:
SHF frequencies provide a balance between bandwidth availability and manageable atmospheric losses. This makes them ideal for TV broadcasting, internet services, and weather satellites.


Step-by-Step Solution:

Satellites use C-band (4–8 GHz) and Ku-band (12–18 GHz), both part of SHF range.Thus, SHF = most widely used frequency band for satellites.


Verification / Alternative check:

ITU allocation charts confirm that SHF is the global standard for satellite communication.


Why Other Options Are Wrong:

EHF: too high, severe atmospheric attenuation.UHF and VHF: low capacity, unsuitable for broadband communication.HF: obsolete for modern satellite use.


Common Pitfalls:

Confusing UHF and VHF (used in terrestrial broadcasting) with SHF (used in satellites).


Final Answer:

SHF (Super High Frequency)
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