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Author

Bagci, Hakan (17)

Ulku, Huseyin Arda (17)

Sayed, Sadeed Bin (8)Uysal, Ismail Enes (7)Haji Ali, Abdul Lateef (2)View MoreDepartmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division (17)
Electrical Engineering Program (17)

Computer, Electrical and Mathematical Sciences & Engineering (CEMSE) (15)Physical Sciences and Engineering (PSE) Division (6)Applied Mathematics and Computational Science Program (3)View MoreJournal2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES) (1)IEEE Antennas and Wireless Propagation Letters (1)PublisherInstitute of Electrical and Electronics Engineers (IEEE) (2)SubjectCEM (6)Buffa-Christiansen functions (1)Explicit MOT (1)low-frequency analysis (1)magnetic field integral equation (MFIE) (1)View MoreTypePoster (15)Article (1)Conference Paper (1)Year (Issue Date)2017 (1)2016 (4)2015 (5)2014 (7)Item Availability
Open Access (17)

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An Explicit MOT-TD-VIE Solver for Time Varying Media

Sayed, Sadeed Bin; Ulku, Huseyin Arda; Bagci, Hakan (2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES), Institute of Electrical and Electronics Engineers (IEEE), 2016-03-15) [Conference Paper]

An explicit marching on-in-time (MOT) scheme for solving the time domain electric field integral equation enforced on volumes with time varying dielectric permittivity is proposed. Unknowns of the integral equation and the constitutive relation, i.e., flux density and field intensity, are discretized using full and half Schaubert-Wilton-Glisson functions in space. Temporal interpolation is carried out using band limited approximate prolate spherical wave functions. The discretized coupled system of integral equation and constitutive relation is integrated in time using a PE(CE)m type linear multistep scheme. Unlike the existing MOT methods, the resulting explicit MOT scheme allows for straightforward incorporation of the time variation in the dielectric permittivity.

Transient Analysis of Electromagnetic Wave Interactions on Ferromagnetic Structures Using Landau-Lifshitz-Gilbert and Volume Integral Equations

Sayed, Sadeed Bin; Ulku, Huseyin Arda; Bagci, Hakan (2016-01-06) [Poster]

Analysis of Transient Electromagnetic Interactions on Nanodevices Using a Quantum-corrected Integral Equation Approach

Uysal, Ismail Enes; Ulku, Huseyin Arda; Bagci, Hakan (2016-01-06) [Poster]

Computation of Electromagnetic Fields Scattered From Dielectric Objects of Uncertain Shapes Using MLMC

Litvinenko, Alexander; Haji Ali, Abdul Lateef; Uysal, Ismail Enes; Ulku, Huseyin Arda; Oppelstrup, Jesper; Tempone, Raul; Bagci, Hakan (2016-01-06) [Poster]

Simulators capable of computing scattered fields from objects of uncertain shapes are highly useful in electromagnetics and photonics, where device designs are typically subject to fabrication tolerances. Knowledge of statistical variations in scattered fields is useful in ensuring error-free functioning of devices. Oftentimes such simulators use a Monte Carlo (MC) scheme to sample the random domain, where the variables parameterize the uncertainties in the geometry. At each sample, which corresponds to a realization of the geometry, a deterministic electromagnetic solver is executed to compute the scattered fields. However, to obtain accurate statistics of the scattered fields, the number of MC samples has to be large. This significantly increases the total execution time.
In this work, to address this challenge, the Multilevel MC (MLMC [1]) scheme is used together with a (deterministic) surface integral equation solver. The MLMC achieves a higher efficiency by balancing the statistical errors due to sampling of the random domain and the numerical errors due to discretization of the geometry at each of these samples. Error balancing results in a smaller number of samples requiring coarser discretizations. Consequently, total execution time is significantly shortened.

Stabilizing MOT Solution of TD-VIE for High-Contrast Scatterers using Accurate Extrapolation

Sayed, Sadeed Bin; Ulku, Huseyin Arda; Bagci, Hakan (2014-05-04) [Poster]

Mixed Discretization of the Time Domain MFIE at Low Frequencies

Ulku, Huseyin Arda; Bogaert, Ignace; Cools, Kristof; Andriulli, Francesco Paolo; Bagci, Hakan (IEEE Antennas and Wireless Propagation Letters, Institute of Electrical and Electronics Engineers (IEEE), 2017-01-10) [Article]

Solution of the magnetic field integral equation (MFIE), which is obtained by the classical marching on-in-time (MOT) scheme, becomes inaccurate when the time step is large, i.e., under low-frequency excitation. It is shown here that the inaccuracy stems from the classical MOT scheme’s failure to predict the correct scaling of the current’s Helmholtz components for large time steps. A recently proposed mixed discretization strategy is used to alleviate the inaccuracy problem by restoring the correct scaling of the current’s Helmholtz components under low-frequency excitation.

Nyström-discretized Magnetic Field Integral Equation for 2D Electromagnetic Scattering

Al-Harthi, Noha A.; Ulku, Huseyin Arda; Yokota, Rio; Keyes, David E.; Bagci, Hakan (2014-05-04) [Poster]

A Novel Time Domain Method for Simulating Dissipative Electromagnetic Field Interactions

Uysal, Ismail Enes; Ulku, Huseyin Arda; Bagci, Hakan (2014-05-04) [Poster]

An Explicit and Stable MOT Solver for Time Domain Volume Electric Field Integral Equation

Sayed, Sadeed Bin; Ulku, Huseyin Arda; Bagci, Hakan (2014-05-04) [Poster]

MOT Solution of Time Domain PMCHWT Integral Equation for Conductive Dielectric Scatterers

Uysal, Ismail Enes; Ulku, Huseyin Arda; Bagci, Hakan (2014-01-06) [Poster]

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