This blog aims to introduce the concept and use of matrices that characterize two-port networks from a programmatic perspective. First, a theoretical and conceptual review is carried out, and then the development made with code is emulated, working symbolically and vectorially. Two-port network Transmission matrices arise from the equations that characterize two-port networks. In general, the matrix that characterizes the transmission of a two-port network can be defined as:: $$ T =\begin{bmatrix} t_{11} & t_{12} \\ t_{21} & t_{22} \end{bmatrix} $$ where each value in the matrix $T$ represents a specific relationship between the input and output of the two-port network.