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If the spacing between turns of the helical antenna is zero then it acts as a ________

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If the spacing between turns of the helical antenna is zero then it acts as a ________

(a) Loop antenna

(b) Linear dipole

(c) Parabolic antenna

(d) Log periodic antenna

I got this question during an interview for a job.

This interesting question is from Frequency Independent Antenna in chapter Frequency Independent Antenna of Antennas

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Correct choice is (a) Loop antenna

To explain I would say: The radiation pattern of a helical antenna is a combination of small dipole and loop antenna. The helical antennas behave like a loop antenna when spacing between turns becomes zero. It becomes a linear dipole when the diameter is zero that means itch angle is zero. Parabolic is a reflector antenna. Helical antenna is a wire antenna.

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