Topic: Electromagnetics
For matched junction S parameters, which of the following is correct?
- A. $S_{11}\neq 0$
- B. $S_{11}=0$
- C. $S_{21}=1$
- D. $|S_{21}|=0$
Answer: B. $S_{11}=0$
Explanation: For a perfectly matched junction, the input port is matched to the characteristic impedance of the system, meaning there is no reflection at the input port. Therefore, the reflection coefficient $S_{11}$ is zero.