Time Domain Modeling Method for the Crosstalk Analysis of Multiple Parallel Microstrip Lines

Based on a higher order finite-difference time-domain (FDTD(2,4)) method, and transmission line (TL) equations, an efficient time domain hybrid method is presented for the fast crosstalk analysis of multiple parallel microstrip lines. In this method, the per unit length (p.u.l) inductance and capacitance distribution parameters of multiple microstrip lines are solved by the empirical formulas firstly. Then, the crosstalk model of multiple parallel microstrip lines excited by lumped voltage source is established by the TL equations. Finally, the higher order FDTD (2,4) selecting large space step is utilized to discretize the TL equations to obtain the transient responses on these microstrip lines and terminal loads, which needs less mesh number and improves the computation efficiency without decreasing the calculation accuracy. A numerical example of three parallel microstrip lines excited by lumped voltage source is employed to verify the accuracy and efficiency of this presented method by comparing with the BLT equation and commercial software CST in terms of precision and time consumption. Moreover, the effects of length, height and thickness of microstrip lines on the crosstalk results are simulated and analyzed to master some valuable crosstalk principles.