4. A particular two-port network is driven at port 1 with a matched generator, and terminated at port 2 with a matched load. The total voltage and current at port 1 are measured to be, V₁ = 1.314/12.4° V and I₁ = 15.42-21.5° mA, and the total voltage at port 2 is measured to be, V₂ = 0.8/90° V. If the characteristics impedance is 500, find S₁1 and $21- 5+5=10

Fig: 1