1.

For an unbalanced to balanced signal conversion, if the turn’s ratio in a Balun is 1:2 then the balanced impedance is ______ times the unbalanced impedance.(a) 4(b) 2(c) \(\frac{1}{2} \)(d) \(\frac{1}{4} \)I got this question in a national level competition.Query is from Baluns topic in portion Radiation, Baluns & Polarization of Antennas

Answer»

Right CHOICE is (a) 4

To explain I would say: A BALUN can be viewed as a transformer. \(\FRAC{Z_{unbal}}{Z_{BAL}} = (turns \,ratio)^2=(\frac{1}{2})^2=\frac{1}{4} \)

⇨ Zbal = 4Zunbal

So the balanced impedance is four TIMES the unbalanced impedance.


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