Electronics and Communication Engineering - Electromagnetic Field Theory - Discussion


In a line VSWR of a load is 6 dB. The reflection coefficient will be

[A]. 0.033
[B]. 0.33
[C]. 0.66
[D]. 3.3

Answer: Option C


VSWR = 100.6

Amod Kumar Jha said: (May 27, 2017)  
It should be 0.33.

If voltage or magnitude express in db then the farmula is 20log(v).
And anything related to power is only written in 10log(p), it is the actual meaning of decimal means 10.
We can remember it by viewing p=v^2/r.
Since square term come in the farmula so that 2 goes into multiplication with 10 equal 20, while expressing in log.

I hope now it clear to everyone.

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