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For a helical antenna radiation, the pitch angleα should be _____

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For a helical antenna radiation, the pitch angleα should be _____

(a) 0 < α < 90

(b) α=0

(c) α=90

(d) α=0 or 90

I had been asked this question during an online exam.

This interesting question is from Frequency Independent Antenna topic in portion Frequency Independent Antenna of Antennas

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The correct answer is (a) 0 < α < 90

Easiest explanation: The radiation pattern of the helical antenna is a combination of the small dipole and loop antenna. Pitch angle is the tangent of ratio between the spacing and the circumference of the antenna. α=0, then helical antenna becomes loop antenna. α=90, the helical antenna becomes linear antenna.

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