Frugal Sampling Method for Analysis of Modulating Pulses in Nonlinear-loaded Transmission Lines at mm-wave Frequency

This paper presents a fast, efficient method for analyzing a transmission line, terminated by a nonlinear load and exited by modulating pulses, at mm-wave frequency. The utilized method is based on the time-domain frequency-separation (TDFS) method for nonlinear systems. The number of samples are reduced according to the width of the input modulating pulses and then the unconditionally stable algorithm-based on finite-difference time-domain (FDTD) method is utilized to analyze the distributed model of the transmission line according to each sample. An example of a transmission line analyzed with the proposed method is given. The good agreement between the results of the applied method and the conventional leapfrog method (and also simulation results using ADS software) confirms the accuracy of the presented method. The comparisons of the CPU time consumption between the two methods indicate 99.79% improvements.