Attenuation constant

When a signal is propagated along a line of transmission, its amplitude will decrease because of the losses in the line. In the case of an adapted line, càd. finished by its characteristic Impedance, one can write:

$V\_l\; =\; V\_0\; \backslash \; cdot\; 10^\; \{-\; \backslash \; frac\; \{\backslash \; alpha\; L\}\; \{20\}\}\; \backslash ,$

where $V\_0\; \backslash ,$ and $V\_l\; \backslash ,$ are the values of the amplitude of the signal in the beginning and a distance L of the beginning of the line, and $\backslash \; alpha\; \backslash ,$ is the attenuation constant. It is given by the manufacturers of the line and it is expressed in dB /km.

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