Principles of Communication: Mobile Communication MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow

Mobile CommunicationHardQuestion 20306

Question

In 5G NR, millimeter-wave (mmWave) bands (24–100 GHz) offer high capacity but suffer from:

A
Very low frequency making antennas huge
B
Poor penetration through walls and high atmospheric absorption
Correct
C
Interference from ionosphere
D
Inability to support MIMO

Correct answer

Poor penetration through walls and high atmospheric absorption

Explanation

mmWave: very high bandwidth (GHz of spectrum available) → Gbps data rates. However: (1) poor building penetration (concrete blocks ~40 dB); (2) atmospheric absorption (O₂ at 60 GHz: ~15 dB/km); (3) rain fade; (4) short range (~200 m). Requires massive MIMO beamforming and dense deployment of small cells.

Review Principles of Communication notes Start timed chapter practice