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Which of the following Balun contains a sliding short circuit bar for frequency adjustment?

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Which of the following Balun contains a sliding short circuit bar for frequency adjustment?

(a) Type – 1

(b) Sleeve Balun

(c) Type – 2

(d) Type – 3

This question was addressed to me during an interview for a job.

This key question is from Types of Baluns in section Radiation, Baluns & Polarization of Antennas

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Correct choice is (d) Type – 3

To explain: Type – 3 Baluns has a sliding short circuit bar for frequency adjustment. Sleeve Balun or Type -1 Balun has a λ/4 sleeve which is shorted at base electrically.

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