Topic: Microwave Engineering
Input reflection coefficient 'S_11' of the 2-port network for 50 Ή system is:
- A. 1/3 ∠0
- B. 1/2 ∠180
- C. 1/3 ∠180
- D. 1/2 ∠0
Answer: C. 1/3 ∠180
Explanation: Normalized impedance Z = 1 / Z_o * Z_parameter. Computing S = (Z - U)(Z + U)^-1 gives S_11 = -1/3 = 1/3 ∠180 .