Discussion
What is a folded dipole's input impedance relative to a plain dipole?
Answer: C
The folded arrangement carries the same total current shared between two conductors, and the voltage is doubled, which raises the impedance by a factor of four to about 300 ohms. That matches ribbon feeder directly and, with a four to one balun, matches fifty ohm coaxial cable. It also gives a wider bandwidth than a plain dipole, which is why it is the driven element of most Yagi arrays. The factor is exactly four for two equal conductors and rises further if their diameters differ.
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