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Reflection coefficient vs Transmission coefficient

This page on Reflection coefficient vs Transmission coefficient describes difference between Reflection coefficient and Transmission coefficient.


The Reflection coefficient measures amplitude of reflected wave versus amplitude of incident wave. The reflection coefficient is defined as ratio of reflected voltage wave amplitude to incident voltage wave amplitude i.e. Er/Ei .
The same in terms of impedances is expressed as below:

Reflection coefficient (Γ) = (ZL - ZS)/(ZL + ZS) where ZL is the load impedance and ZS is the source impedance.


The Transmission coefficient measures amplitude of transmitted wave versus amplitude of incident wave. The transmission coefficient is defined as ratio of transmitted voltage wave amplitude to incident voltage wave amplitude i.e. Et/Ei Transmission coefficient is expressed as below:

Transmission coefficient (T) = (2 ZL)/(ZL + ZS)

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