Modeling of Inhomogeneous Dielectric Layers Using TLM Cuboid Condensed Node

Q. Zhang and W. J. R. Hoefer

IEEE Antennas and Propagation Society International Symposium, pp 774-777, Newport Beach, California USA, June 18-23 1995.


This paper describes a modification of the transmission line matrix (TLM) method for numerical analysis of multi-dielectric layer structures by means of the 3D cuboid condensed node. An interface scattering algorithm is applied to properly represent the impedance step across the interface. A parallel plate resonator with two dielectric layers is analyzed with the cuboid scheme, and the results are compared with theoretically accurate values as well as results obtained with traditional stub-loaded TLM. The comparison clearly indicates that the cuboid cell is more flexible and more accurate than the stub-loaded scheme.

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