Incorporation of terminal constraints in the FDTD analysis of transmission lines

A method of incorporating lumped terminal conditions into a finite-difference, time-domain (FDTD) analysis of multiconductor transmission lines is given. The method provides an exact solution of the transmission-line equations via the FDTD technique when the line discretization, /spl Delta/t, and the time discretization, /spl Delta/t, are chosen such that /spl Delta/t=/spl Delta/z/v where v is the phase velocity of propagation on the line. Examples are given to show that in the case of a multiconductor line in an inhomogeneous medium where the mode velocities are not identical, the method gives accurate results with a minimum of computational effort.<
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