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What is the Input impedance of the axial feed helical antenna with circumference per unit wavelength is 1.2?

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What is the Input impedance of the axial feed helical antenna with circumference per unit wavelength is 1.2?

(a) 168Ω

(b) 186Ω

(c) 198Ω

(d) 158Ω

I have been asked this question in examination.

I need to ask this question from Frequency Independent Antenna in division Frequency Independent Antenna of Antennas

1 Answer

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Correct option is (a) 168Ω

The explanation: Input impedance of helical antenna with axial feed is given by \(Z=140 \frac{C}{λ}\)

\(Z=140 \frac{C}{λ}=140×1.2=168\Omega\)

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