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—Based on,the piecewise linear recursive convolution (PLRC) technique, FDTD modeling of Arbitrary linear lumped networks is studied in this paper, including one-port networks and two-port networks. Their general FDTD iterative formulations are obtained. Firstly, the admittance parameters in Laplace domain of lumped,network are written as a summation,form of several rational fractions; then the time domain admittance parameters can be obtained by means of inverse Fourier transform technique. Finally the time domain results are directly incorporated into the Maxwell- Ampere’s difference equation using the PLRC technique. It is worth pointing out that this approach preserves the second-order accuracy and the explicit nature of the conventional FDTD method. The proposed technique can be extended to model arbitrary linear multi- port lumped networks. To show the validity of the proposed algorithm, we analyze two microstrip circuits including lumped,networks. The results are compared,with those obtained from the Z-transform technique and the good agreement is achieved. 328,Chen and Chu

FDTD MODELING OF ARBITRARY LINEAR LUMPED NETWORKS USING PIECEWISE LINEAR RECURSIVE CONVOLUTION TECHNIQUE