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

Answer: Option A

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.

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