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S parameters measured by network analyzer

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shahid78

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i am a bit confused on interpreting the scattering parameter results shown by network analyzer

for example the S11 shown by network analyzer for any antenna is in dB.

now if i want to calculate the abosulte values which formula should i use

S11(dB)=20 log ( S11)

or

S11(dB)=10 log (S11)


any help will be highly appreciated

regards
 

thank you,
i was also have this doubt .
 

well S11 is measuring in terms of power so u have to take 10 log formula

because S=a/b
where a nd b are incident and reflected power waves

u can refer to manual it will further confirm
 

I agree since the parameters are measured as power levels it should be the 10log variant. This can easily be derived from the definition of a decibel.

Cheers,
Slayer
 

S-parameter is complex (magnitude and phase) so it cotains more information than the power ratio. In any case, even if you define it as a RATIO of two powers, it doesn't have the unit of power. 10Log is incorrect.
 

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