Huawei Certified ICT Associate – WLAN (HCIA-WLAN) — Question 22

Which of the following statements about antenna polarization are true? (Choose all that apply.)

Answer options

• A. An antenna emits electromagnetic waves to the surrounding space. The electric field vector follows a regular rhythm of changes.
• B. Antenna polarization refers to the magnetic field vector generated when an antenna radiates power.
• C. If the electric field vector of the radio wave is perpendicular to the ground, the radio wave is a vertical polarized wave.
• D. A dual-polarized antenna integrates two antennas whose polarization directions are perpendicular to each other to maximize the diversity gains and save installation space.

Correct answer: A, B, D

Explanation

Option A is correct as it accurately describes how antennas emit electromagnetic waves with a varying electric field vector. Option B is incorrect because antenna polarization is defined by the orientation of the electric field vector, not the magnetic field vector. Option C is incorrect because it misinterprets the definition of vertical polarization; it should specify the orientation of the electric field vector. Option D is correct as it correctly describes the function of dual-polarized antennas.