For maximum absorption of energy from electromagnetic fields, the receiving antenna should be oriented with respect to which plane?

• A. Plane of polarization
• B. Ground plane
• C. Radiation pattern
• D. Incident angle

Answer: (A)

Maximizing energy capture relies on polarization matching. The electromagnetic wave has its electric field oscillating in a specific plane, called the plane of polarization. An antenna responds most strongly when its conducting elements are aligned with that electric field orientation, so the wave’s E-field efficiently induces current in the antenna. If the antenna is rotated away from the plane of polarization, the induced current—and thus the received power—drops roughly with the square of the alignment (cos^2 of the misalignment angle). Ground plane, radiation pattern, and incident angle influence other aspects of reception (impedance, directionality, and how much energy arrives in the first place), but the dominant factor for maximum absorption is keeping the antenna oriented with the plane of polarization.