Electronics and Communication Engineering - Microwave Communication - Discussion


A line has an attenuation of 0.054 Np/m. The attenuation in decibels is

[A]. 4.7 dB/m
[B]. 0.47 dB/m
[C]. 0.54 dB/m
[D]. 5.4 dB/m

Answer: Option B


0.054 x 8.68 = 0.47 dB/m.

Mhd said: (Aug 11, 2016)  
How 8.68 came?

Niru said: (Sep 20, 2016)  
Please explain it.

Suribabu J said: (Mar 28, 2017)  
Neper per meter (Np/m) is a unit used to express ratios, such as gain, loss, and relative values.

Then 2.718281828 is used in computing the ratio in Nepers. values of interest and ln is the natural logarithm, i.e, logarithm to the base, One neper Np /20 / (ln10) = 8.685889638 dB.

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