Discussion
What does the array factor describe?
Answer: B
The array factor is the pattern that would result if every element were replaced by an isotropic radiator, so it captures the geometry and the excitation alone. Multiplying it by the element pattern gives the total. Element count does not simply multiply gain, mutual impedance is a separate calculation, and feed efficiency affects amplitude rather than shape. Separating geometry from element in this way is what makes array design tractable at all. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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