What is the effect of polarization mismatch between transmitter and antenna, and how can it be mitigated?

• A. Using matching polarization, dual-polarized antennas, or alignment.
• B. Using higher transmission frequency.
• C. Polarization mismatch is mitigated by using matching polarization, dual-polarized antennas, or proper alignment.
• D. Polarization has no effect on system performance.

Answer: (C)

Polarization mismatch reduces the amount of transmitted power that the receiving antenna can effectively capture because the electric field orientation at the receiver doesn’t align with the receiver’s polarization. The signal the receiver picks up is proportional to the projection of the transmitted field onto the receiver’s polarization, so any misalignment lowers the received strength (often described as a loss in the link budget).

This is why matching polarization is important: if the transmitter and receiver use the same polarization, the field fully projects onto the receiving antenna, giving maximum coupling. Using dual-polarized antennas provides two orthogonal polarizations, so you can select or combine the polarization that matches the other end, improving reliability when orientation changes or multipath adds polarization components. Proper physical alignment ensures the polarizations stay aligned during operation.

Higher transmission frequency doesn’t fix polarization alignment, and polarization does affect performance, so those options don’t address the issue.