Topic: Transmission Lines
If the reflected wave at the load of a transmission line is 20 dB below the incident wave, the SWR at the load is:
- A. 1.5
- B. 1.22
- C. 3.0
- D. 4.0
Answer: B. 1.22
Explanation: Given V_R / V_I = -20 dB = -20 log10 |Gamma|, so |Gamma| = 0.1. SWR = (1 + |Gamma|) / (1 - |Gamma|) = 1.1 / 0.9 = 1.22.