Browsing by Author "Ufimtsev, Pyotr Ya"

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Citation Count: 6
Diffraction at Rounded Wedges: MoM Modeling of PTD Fringe Waves
(Applied Computational Electromagnetics Soc, 2017) Apaydin, Gokhan; Sevgi, Levent; Ufimtsev, Pyotr Ya
The paper examines diffraction at rounded wedges with perfectly conducting faces. This topic was a subject of many publications which investigated mainly the total diffracted waves. In the present paper, we calculate specifically their fringe components to illustrate their sensitivity to the edge curvature. Such fringe waves provide substantial contributions to the scattered field in certain directions and represent a key element in extension of the physical theory of diffraction (PTD) for objects with rounded edges.
Citation Count: 5
Extension of PTD for Finite Objects With Rounded Edges: Diffraction at a Soft Trilateral Cylinder
(Ieee-inst Electrical Electronics Engineers inc, 2017) Apaydin, Gokhan; Sevgi, Levent; Ufimtsev, Pyotr Ya
The letter extends the physical theory of diffraction (PTD) for objects with rounded edges. It represents a combination of the fundamental PTD concept of fringe currents and the method of moments (MoM). The objects in the vicinity of edges are considered as parts of appropriate tangential wedges. Integral equations are formulated for fringe currents on these wedges and solved by the MoM. Then, a far field radiated by these currents is calculated. A very good agreement is observed with the field produced by the currents induced on the actual scattering object when its size exceeds a few wavelengths.
Citation Count: 9
Fringe Waves from a Wedge With One Face Electric and the Other Face Magnetic
(Ieee-inst Electrical Electronics Engineers inc, 2016) Apaydin, Gokhan; Hacivelioglu, Feray; Sevgi, Levent; Ufimtsev, Pyotr Ya
Fringe waves represent the diffracted field generated by the nonuniform/fringe surface currents concentrated in vicinity of sharp scattering edges. For perfectly conducting wedges, they have been studied in a number of publications. In this communication, fringe waves for a wedge with one face electric and the other magnetic are analyzed analytically and numerically.