For the T$-$junction $(3-$port$),$ calculate all the waves and voltages using the S$-$parameter matrix $($and check them using standard network theory$)$ when: a$)$ Port $2$ is open$-$circuited and Port $3$ is connected to a $100$ Ohm load. b$)$ Port $2$ is short circuited but there is an extra W$/8$ line section in Port $2,$ and Port $3$ is connected to a $50$ ohm load. You should do a shift in the reference place and get the new S$-$matrix. c$)$ Port $2$ and Port $3$ are connected to each other $($with length between the two ports$=0).$ Explain physically what is happening