Question

Which of the following Balun changes the shape of the unbalanced transmission line to that of a balanced transmission line?

(a) Sleeve Balun

(b) Folded Balun

(c) Tapered Balun

(d) Infinite Balun

I have been asked this question by my school teacher while I was bunking the class.

My enquiry is from Types of Baluns topic in chapter Radiation, Baluns & Polarization of Antennas

Answer 1

Correct option is (c) Tapered Balun

For explanation I would say: Tapered Balun changes the shape of the unbalanced transmission line to that of a balanced transmission line. Sleeve Balun uses a λ/4 sleeve which is shorted at base electrically and it provides infinite impedance at the top. Infinite Balun uses the current flowing outside the conductor as a part of antenna.