Publications

 Journal  Articles

1- Tekbas, K., Berenger, J.-P., Angulo, L. D., Cabello, M. R., and  Salvador G., “FDTD Voxels-in-Cell method with Debye media”, IEEE Transactions on Antennas and Propagation, vol. 72, no. 5, pp. 4431-4439, May 2024.

This paper extends the VIC method to voxels filled with Debye media. As compared to using cells equal in size to the voxels size, the overall number of cells is widely reduced while the FDTD time step can be enlarged, resulting in a large reduction of the computational burden. Click to access. 

2- Manterola, A. M., Angulo, L. D., Bravo, A. G., Tekbaş, K, Moreno, R., and Garcia, S. G., “Impedance Modelling of Common Mode Ferrite Chokes using Transmission Line Theory”, IEEE Transactions on Power Electronics, vol. 39, no. 4, pp. 4224-4233, April 2024.

We introduce an impedance model, based on transmission line (TL) theory, for common mode ferrite chokes. The proposed model considers the geometrical properties of the choke, the distribution of electromagnetic fields within the core material and the impact of the measurement setup. The validity of the model was tested through numerical simulations. As a practical application, the model was applied to estimate the complex permeability of MnZn and NiZn cores from impedance measurements, resulting in a range of values compatible with those reported in other works. Click to access. 

3- Bravo, A. G., Garcia, S. G., Manterola, A. M., Añón-Cancela, M., Moreno, R., Tekbaş, K. and Angulo, L. D., “Time Domain Simulation of Common Mode Ferrite Chokes at System Level”, IEEE Transactions on Electromagnetic Compatibility, vol. 65, no. 6, pp. 1900-1908, Dec. 2023.

This article presents a comprehensive methodology for analyzing common-mode (CM) ferrite chokes in time-domain (TD) methods, employing lumped dispersive loads, and validates it through a typical test setup for cable crosstalk assessment.  Click to access. 

4- Tekbas, K. and Berenger, J.-P., “Finite-Difference Time-Domain (FDTD) Method with Non-Homogeneous Cells Filled with Voxels”, Journal of Computational Physics, vol. 489, pp. 112266, Sep. 2023.

With the objective of reducing the overall number of FDTD cells in applications where the objects of interest are given as sets of voxels, a subcell technique is introduced to allow the FDTD method to account for non-homogeneous cells composed with voxels of different permittivity's. Numerical experiments with dielectric objects are reported to illustrate the effectiveness and the limitations of the method. Click to access. 

5- Tekbas, K. and Berenger, J.-P., “An FDTD Algorithm for Numerical Anatomical Models with Cells Containing Several Debye Media”, IEEE Transactions on Electromagnetic Compatibility, vol. 63, no. 3, pp. 947-950, June 2021.

This paper describes a novel procedure for the coarse meshing of the digital human phantom, and allocation of the one-pole Debye media parameters of tissues in a coarse cell using the subcell technique in FDTD method. The paper shows that the proposed procedure permits either the accuracy to be improved or the computational time to be reduced by increasing the cell size. Click to access. 

6- Tekbas, K., Costen, F., Berenger, J.-P., Himeno, R. and Yokota, H. “Subcell Modelling Frequency-Dependent Thin Layers in the FDTD Method”, IEEE Transactions on Antennas and Propagation, vol. 65, pp. 278-286, Jan. 2017.

This paper presents a novel subcell technique applying the integral form of the Maxwell-Ampere equation in a  coarse cell containing   electrically-fine geometrical features, and then advancing the field components in time  using two different approaches; the first approach requires the solution of (M + 1)-order differential equation, where M is the number of frequency-dependent media in the cell, whereas the second approach requires the solution of M 2nd-order simultaneous equations. The paper shows that both approaches can handle one or several frequency dependent thin layers embedded in a frequency dependent medium without instability. Click to access. 

 Conference  Articles

1- Tekbas, K., Berenger, J.-P., Angulo, L. D., Cabello, M. R., and  Salvador G.,  "Accelerating Finite-Difference Time-Domain (FDTD) Solvers using Voxels-in-Cell Method", 2024 IEEE International Symposium on Antennas and Propagation and INC/USNC‐URSI Radio Science Meeting (AP-S/INC-USNC-URSI), Firenze, Italy, 2024, pp. 213-214.

This paper presents some applications of VIC method in electromagnetic problems and show that the accuracy of the method is preserved while large reductions of the computational requirements can be achieved. Click to access. 

2- A. M. Manterola, F. Amador, L. D. Angulo, S. G. García, A. G. Bravo and Tekbas, K., "OpenSEMBA/DGTD: An Open-Source Full-Wave Maxwell’s Equations Solver," 2024 International Applied Computational Electromagnetics Society Symposium (ACES-China), Xi'an, China, 2024, pp. 1-3.

In this work, we focus on the discontinuous Galerkin in the time domain (DGTD) method, utilizing the MFEM finite element method library to develop a Maxwell's equations solver across multiple dimensions. We have implemented a basic DGTD solver, with plans for further enhancements in the future. Our goal is to facilitate the simulation of complex physical problems while optimizing both accuracy and computational efficiency. Click to access.