Topic: Microwave Engineering
In two wire transmission line, two consecutive voltage minima are found at 20.6 cm and 25.6 cm. The operating frequency is:
- A. 3.5 GHz
- B. 3 GHz
- C. 1 GHz
- D. 2.5 GHz
Answer: B. 3 GHz
Explanation: d1 = 20.6 cm, d2 = 25.6 cm. Distance between two successive minima = λ/2 = d2 - d1. So, λ = 2(25.6 - 20.6) = 10 cm. Operating frequency f = c/λ = (3 x 10^10)/10 = 3 GHz.