Satellite Communications Bands (Uplink/Downlink Ranges) Which of the following options corresponds to a commonly used satellite communication frequency band?

Introduction / Context:
Satellite communications use several standardized microwave bands. Classic commercial links include C band, Ku band, and Ka band, with center frequencies chosen to balance atmospheric attenuation and bandwidth needs.

Given Data / Assumptions:

• We are selecting from broad ranges, not precise allocations.
• Atmospheric losses are modest in C band and increase with frequency.

Concept / Approach:

The 3 to 6 GHz range corresponds to the C band, commonly used for satellite downlinks near 3.7–4.2 GHz and uplinks near 5.9–6.4 GHz in many regions. Lower ranges (kHz or MHz) are unsuitable for high-throughput satcom, while extremely high bands (100+ GHz) are specialized and face high atmospheric loss.

Step-by-Step Solution:

Verification / Alternative check:

ITU and operator band plans document C-band allocations in this range.

Why Other Options Are Wrong:

10–20 MHz and 50–70 MHz are HF/VHF, not satcom carriers. 100–120 GHz is experimental with high atmospheric attenuation. 200–300 kHz is LF.

Common Pitfalls:

Confusing radar bands with satcom bands; overlooking regional allocation differences.

Final Answer:

3 to 6 GHz