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The ratio in dB of the power incident on a transmission line discontinuity
to the power reflected from the discontinuity.
More broadly, the return loss is a measure of the dissimilarity between
two impedances, being equal to the number of decibels that correspond to
the scalar value of the reciprocal of the reflection coefficient
RL =20 log {MAG[(Z1+Z2)/(Z1-Z2)]}.
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Index