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If the input impedance of a half wave dipole Yagi-Uda is 73Ω, then input impedance of a half wave folded dipole as driven element is ____

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If the input impedance of a half wave dipole Yagi-Uda is 73Ω, then input impedance of a half wave folded dipole as driven element is ____

(a) 73Ω

(b) 146Ω

(c) 36.5Ω

(d) 292Ω
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Right answer is (d) 292Ω

To explain I would say: Half wave folded dipole impedance is 4 times the half wave dipole.

⇨ Z = 4 × 73 = 292Ω.
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