Question

For a 4: 1 Balun, what is the unbalanced impedance if the balanced impedance is 2KΩ?

(a) 8K

(b) 0.5K

(c) 4K

(d) 2K

This question was addressed to me during a job interview.

I'd like to ask this question from Baluns topic in chapter Radiation, Baluns & Polarization of Antennas

Answer 1

Right option is (b) 0.5K

To explain: A 4: 1 Balun implies its impedance ratio. \(\frac{Z_{bal}}{Z_{unbal}} = \frac{4}{1} \)

Unbalanced impedance = 2K/4=0.5K.