Time domain analysis of transmission line using FDTD excited by modulated signal

In this paper, an unconditionally stable algorithm for time domain analysis of multiconductor transmission line using finite- difference time- domain (FDTD) is proposed. The results of the proposed algorithm are verified with the Leap-Frog algorithm. The complex phasor method is applied to multiconductor transmission line when the transmission line is extracted by modulated signal. The extracted equation is solved using the unconditionally stable formula. The results of the new equation are compared with the results of transmission line equation solved using Leap-Frog algorithm. Whereas the CPU time of the proposed method is very lower than the conventional method, the results of proposed method has a good agreement with the results of conventional method.