Abstract
Residual reflection from absorbing boundaries that truncate the computational mesh in the finite-difference time-domain method introduces significant error in the characterization of transmission lines and discontinuities employed in microwave and millimeter-wave integrated circuits. We apply the least squares Prony's method to accurately estimate the complex reflection coefficient in the frequency domain by representing the sampled electric field of a microstrip transmission line as a plane wave super-position of incident and reflected waves. This estimate is used to correct the effective dielectric constant of the line over a wide frequency range, which corroborates well with published results. >
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