A four-port network has the scattering matrix shown below (the system characteristic impedance is Zo =...

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A four-port network has the scattering matrix shown below (the system characteristic impedance is Zo = 50 22). a) What is the return loss at port 4 when all other ports are matched? What is the insertion loss from port 3 to port 4, when all other ports are matched? b) What is the reflection coefficient seen at port 4 if a 75 2 resistor is placed at the terminal plane of port 1, and all other ports are matched? [S] = 0 0.5-45° 0 0.75/30° 0.5-45° 0 0.6 Z-60° 0 0 0.6 Z-60° 0 0.65-30° 0.75/-30° 0 0.65-30° 0.2/45° A four-port network has the scattering matrix shown below (the system characteristic impedance is Zo = 50 22). a) What is the return loss at port 4 when all other ports are matched? What is the insertion loss from port 3 to port 4, when all other ports are matched? b) What is the reflection coefficient seen at port 4 if a 75 2 resistor is placed at the terminal plane of port 1, and all other ports are matched? [S] = 0 0.5-45° 0 0.75/30° 0.5-45° 0 0.6 Z-60° 0 0 0.6 Z-60° 0 0.65-30° 0.75/-30° 0 0.65-30° 0.2/45°