# Electronics and Communication Engineering - Electromagnetic Field Theory - Discussion

1.

ZL = 200 Ω and it is desired that Zi = 50 Ω The quarter wave transformer should have a characteristic impedance of

 [A]. 100 Ω [B]. 40 Ω [C]. 10000 Ω [D]. 4 Ω

Explanation:

Z0 = Zi . ZL

 Saurav said: (May 8, 2016) What is ZL and ZI?

 Md Asif said: (Jun 22, 2016) ZL = LOAD IMPIDENCE. ZI = INPUT IMPIDENCE. ZO = CHARACTERSTICS IMPIDENSES.

 Nitin said: (Jun 25, 2016) What is the importance of "quarter wave" which is mentioned in the question?

 Phyaffin said: (Oct 22, 2016) ZL = load impedance. Zi = input impedance at the input of quarter wave transformer. The above two have to be matched, so that what should be the characteristic impedance of QWT. We have, Zo^2 = sqrt(ZL * Zi). Therefore, Zo = 100 Ω.

 Mohan said: (Jul 21, 2018) Thanks for the explanation.

 Siri said: (Jul 25, 2018) Thank you for the explanation.

 Himanshu said: (Aug 30, 2018) Thanks for the answer.

 Manjunath G Hegde said: (Mar 13, 2019) Thanks @Phyaffin.

 Meiyyappan said: (May 22, 2019) Thanks for the explanation @Phyaffin.