Editing Two-port network (section)

==Scattering transfer parameters (''T''-parameters)==
{{See also|Scattering transfer parameters}}
Scattering transfer parameters, like scattering parameters, are defined in terms of incident and reflected waves.  The difference is that {{mvar|T}}-parameters relate the waves at port 1 to the waves at port 2 whereas {{mvar|S}}-parameters relate the reflected waves to the incident waves.  In this respect {{mvar|T}}-parameters fill the same role as {{mvar|ABCD}} parameters and allow the {{mvar|T}}-parameters of cascaded networks to be calculated by matrix multiplication of the component networks.  {{mvar|T}}-parameters, like {{mvar|ABCD}} parameters, can also be called transmission parameters.  The definition is,<ref name=Vas137/><ref>Egan, pp. 12–15</ref>

:<math> \begin{bmatrix} a_1 \\ b_1 \end{bmatrix} = \begin{bmatrix} T_{11} & T_{12} \\ T_{21} & T_{22} \end{bmatrix} \begin{bmatrix} b_2 \\ a_2 \end{bmatrix} </math>

{{mvar|T}}-parameters are not as easy to measure directly as {{mvar|S}}-parameters.  However, {{mvar|S}}-parameters are easily converted to {{mvar|T}}-parameters, see main article for details.<ref>Egan, pp. 13–14</ref>