Browsing by Author "Uslu, Mehmet Alper"

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Citation Count: 15
Double Tip Diffraction Modeling: Finite Difference Time Domain vs. Method of Moments
(Ieee-inst Electrical Electronics Engineers inc, 2014) Uslu, Mehmet Alper; Apaydin, Gokhan; Sevgi, Levent
Discontinuities such as tips and edges cause diffracted electromagnetic waves interact with objects. Two-dimensional (2D) wedge with non-penetrable boundaries is a canonical structure which has long been investigated analytically and numerically for the understanding and extraction of diffracted waves. Multiple-diffraction has also been investigated. Here, double tip diffraction is modeled with both finite-difference time-domain and method of moments and reference data are generated.
Citation Count: 2
Finite Difference Time Domain Modeling of Fringe Waves
(Applied Computational Electromagnetics Soc, 2017) Uslu, Mehmet Alper; Apaydin, Gokhan; Sevgi, Levent
A novel method is introduced for calculating fringe currents and fringe waves around the tip of a perfectly reflecting wedge under line source illumination. The time-domain fringe (non-uniform) currents are extracted with the finite-difference time-domain (FDTD) method. These currents are then fed into a free-space FDTD and fringe waves are excited. Alternatively, fringe waves are also obtained using the Green's function approach. The validation of the proposed method and the verification of the results are done against the physical theory of diffraction (PTD) as well as the method of moments (MoM). The factors affecting the accuracy are also discussed.