Coaxial cable signal transmission analysis and fault location

In view of the high frequency signal transmission in coaxial cable, we can't adopt the ideal lumped parameter theory, and should use the transmission line theory [1]. Through the microwave equivalent circuit method and one - dimensional distribution equivalent circuit, we established the coaxial cable circuit model, which help us to analyze the characteristics of high-frequency signal transmission in the transmission line, mainly including characteristic impedance and the main influencing factors. Finally, combining with the established transmission model and the test result, we analyze the change of the characteristic impedance in the faulty cable, and locate the fault of the cable accurately, which is instructive for the better application of the coaxial cable.