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What is a Balun?

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What is a Balun?

(a) It is used to balance the unbalanced systems

(b) It unbalances the balanced systems

(c) A twisted wire

(d) Main beam of antenna with large beam width

I had been asked this question in an interview for job.

Question is from Baluns in chapter Radiation, Baluns & Polarization of Antennas

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Correct choice is (a) It is used to balance the unbalanced systems

For explanation I would say: A Balun is a device which connects a balanced two –conductor line to an unbalanced coaxial line. It eliminates field mismatch. The current distribution is present in the inner conductor and is zero at the outer conductor.

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