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Corrected impulse invariance method for dispersive media using FDTD

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2 Author(s)
Eng Leong Tan ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore ; Ding Yu Heh

Electromagnetic wave propagation in dispersive media can be modeled conveniently using the finite-difference time-domain (FDTD) method in conjunction with the impulse invariance method of Z-transform theory. However, the classical impulse invariance method has been found to be incorrect and inaccurate when the impulse response is discontinuous at the initial time t = 0 . A corrected impulse invariance method is employed in this paper to develop the FDTD update equations for modeling dispersive media. Numerical results show that improved accuracy can be achieved through the corrected impulse invariance method compared to the classical impulse invariance method.

Published in:

Electromagnetic Compatibility and 19th International Zurich Symposium on Electromagnetic Compatibility, 2008. APEMC 2008. Asia-Pacific Symposium on

Date of Conference:

19-23 May 2008

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