Discussion
What happens to a Yagi's driving point impedance as directors are added?
Answer: C
Mutual coupling from the closely spaced parasites loads the driven element heavily and pulls its resistance down, sometimes to ten or twenty ohms on a long array. That is why a folded dipole, with its four to one step up, is so often used as the driven element, or a gamma or T match is fitted. The impedance remains resistive at the design frequency once the element is trimmed. Coupling that improves the pattern also complicates the match, which is the recurring tension in parasitic arrays.
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