Difficulty: Medium
Correct Answer: It results in lesser signal attenuation
Explanation:
Introduction / Context:In satellite communication, uplink and downlink frequencies are chosen carefully. Typically, uplinks use higher frequencies (e.g., 6 GHz for C-band uplink vs 4 GHz for downlink) because of differences in attenuation and power availability.
Given Data / Assumptions:
Concept / Approach:Since Earth stations can generate high-power signals, uplinks can be sent at higher frequencies (with higher attenuation). Satellites, with limited power, use lower frequencies for downlinks to ensure signals reach users reliably.
Step-by-Step Solution:
Earth station uplink frequency = 6 GHz (high power available).Satellite downlink frequency = 4 GHz (lower attenuation, weaker power source).Thus, uplink is set higher to manage system efficiency.Verification / Alternative check:
Practical systems: C-band (uplink 6 GHz, downlink 4 GHz) and Ku-band (uplink 14 GHz, downlink 12 GHz).Why Other Options Are Wrong:
Beam-shaping and polarization are secondary benefits, not the primary reason.Narrow beams are due to antenna design, not uplink frequency selection.Antenna size considerations apply, but attenuation is the decisive factor.Common Pitfalls:
Confusing uplink frequency selection with antenna design or polarization efficiency.Final Answer:
It results in lesser signal attenuation
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