here to go to our page on calculating transmission line losses
The Neper (Np) is similar to
the decibel (dB). It's unitless and is used to express ratios. The
Neper uses the natural logarithm, and is named after Microwave Hall-of-Famer
John Napier. Instead of using
the logarithm function (base 10), the Neper uses the base "e".
For voltage ratio of a/b, the difference in calculation is shown
The difference between a dB and
a Neper is just a fixed ratio. This is computed by dividing the
The simplification is done by
noting that ln(x)=log(x)*ln(10), if you remember your high-school
math! Nepers are typically used in loss calculations in the attenuation
constant of the propagation constant:
is in nepers/meter.
This is important, so remember