Topic: Transmission Lines
A lossless transmission line has the distributed circuit parameters of inductance and capacitance per meter as 625 nH/m and 64 pF/m respectively, the phase constant of the line at 100 MHz is:
- A. 3.97 rad/m
- B. 18.42 rad/m
- C. 1.56 rad/m
- D. 9.21 rad/m
Answer: A. 3.97 rad/m
Explanation: Vphase = 1/√(LC) = 1/√(625 x 10^-9 x 64 x 10^-12) = 1.58 x 10^8 m/sec. Phase constant β = 2πf/Vphase = (2π x 10^8)/(1.58 x 10^8) = 3.97 rad/m.