Discussion
Why is the impedance of a dipole in an array different from its isolated value?
Answer: B
The voltage at each terminal now includes contributions induced by every other element, so the ratio of voltage to current, which is the driving point impedance, shifts and may become quite different from the isolated value. In a closely spaced array it can even go negative in the real part for a parasitic element. Feeder length, array gain and feeding arrangement are all separate variables. This is the practical reason arrays are matched as built rather than element by element.
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