Analysis of coupled transmission lines with power-law characteristic impedance

In this paper, we present a frequency-domain method for analyzing multiple- coupled nonuniform lossless transmission lines with power law characteristi c impedance. The method of the solution is based on the modal decomposition method. Using modal decomposition method the system of coupled partial dif ferential equations are decomposed to a number of uncoupled ordinary wave e quations, which are then solved in frequency domain. Finally, the fast Four ier transform algorithm is used to find the time-domain response.