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What is the pitch angle of the helical antenna to become a linear antenna?

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What is the pitch angle of the helical antenna to become a linear antenna?

(a) 90

(b) 0

(c) 45

(d) 60

I got this question in my homework.

The question is from Frequency Independent Antenna in portion Frequency Independent Antenna of Antennas

1 Answer

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Correct choice is (a) 90

To explain I would say: C is the circumference and L is the length, s is the spacing between turns.

When pitch angle α=90, the separation between turns becomes parallel to length (tending to infinity pitch angle) hence it acts as a linear antenna.

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