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- Title
New FDTD Method to Estimate the Dielectric Constant and Loss Tangent of a Bilayer Dielectric Material at X-Band Frequencies.
- Authors
AIT BENALI, Lahcen; TRIBAK, Abdelwahed; TERHZAZ, Jaouad; Ibanez, Tomas Fernandez
- Abstract
In this paper, a new iterative method is presented to estimate the dielectric constant and loss tangent for each layer in a Bi-layer dielectric material using an X-band short-circuited rectangular waveguide WR90. The S11-parameter at the reference plane as a function of dielectric constant and loss tangent of each layer is calculated by applying the two-dimensional finite difference in time-domain method (2DFDTD) for the wave equation. Then, the Nelder-Mead algorithm is applied to estimate the dielectric constant and the loss tangent by matching the measured and calculated S11-parameter. This method has been validated on three bi-layer dielectric materials such as Teflon-FR4 Epoxy and FR4 Epoxy-Plexiglas and Plexiglas-Teflon. A comparison of estimated values of the dielectric constant and loss tangent obtained from FDTD-2D Maxwell's equations measurements and 2D-FDTD Wave equation measurements is presented. Remarkably, this method reduces the execution time by a factor of five while maintaining equal precision.
- Subjects
DIELECTRIC loss; DIELECTRIC materials; FINITE difference time domain method; DIELECTRIC waveguides; MAXWELL equations; FINITE difference method
- Publication
International Journal of Microwave & Optical Technology, 2023, Vol 18, Issue 6, p575
- ISSN
1553-0396
- Publication type
Article