Electromagnetic Scattering and Analysis

An asymptotic iteration method for solving second-order homogeneous linear differential equations of the form y ″ = λ 0 ( x ) y ′ + s 0 ( x ) y is introduced, where λ 0 ( x ) ≠ 0 and s 0 ( x ) are C ∞ functions. Applications to Schrödinger-type problems, including some with highly singular potentials, are presented.

• HAKAN ÇİFTCİ

A uniaxial chiral metamaterial is constructed by double-layered four “U” split ring resonators mutually twisted by 90°. It shows a giant optical activity and circular dichroism. The retrieval results reveal that a negative refractive index is realized for circularly polarized waves due to the large chirality. The expe…

• İ.EVRİM ÇOLAK

This article describes a plane-wave time-domain (PWTD) algorithm that facilitates the fast evaluation of transient wave fields produced by surface scattering. The algorithm presented relies on a Whittaker-type expansion of transient fields in terms of propagating plane waves. The incorporation of the PWTD scheme into…

• AHMET ARİF ERGİN

In the past, both the time-domain electric and magnetic field integral equations have been applied to the analysis of transient scattering from closed structures. Unfortunately, the solutions to both these equations are often corrupted by the presence of spurious interior cavity modes. In this article, a time-domain c…

• AHMET ARİF ERGİN

Recently, a frequency-diverse, metamaterial-based aperture has been introduced in the context of microwave and millimeter wave imaging. The generic form of the aperture is that of a parallel plate waveguide, in which complementary metamaterial elements patterned into the upper plate couple energy from the waveguide mo…

• HAYRETTİN ODABAŞI

The computational complexity of classical marching-on-in-time (MOT) methods for solving time domain integral equations (TDIEs) pertinent to the analysis of transient scattering phenomena involving perfectly conducting targets grows as O(N/sub t/N/sub s//sup 2/) (N/sub t/ and N/sub s/ denote the number of temporal and…

• AHMET ARİF ERGİN

We consider fast and accurate solutions of scattering problems involving increasingly large dielectric objects formulated by surface integral equations. We compare various formulations when the objects are discretized with Rao-Wilton-Glisson functions, and the resulting matrix equations are solved iteratively by emplo…

• ÖZGÜR SALİH ERGÜL

Electromagnetic field transformations are important for electromagnetic simulations and for measurements.Especially for field measurements, the influence of the measurement probe must be considered, and this can be achieved by working with weighted field transformations.This paper is a review paper on weighted field t…

An important extension of the two-level discrete complex image method is proposed to eliminate any concerns on and shortcomings of the approximations of the spatial-domain Green's functions in closed form in planar multilayered media. The proposed approach has been devised to account for the possible wave constituents…

• AYTAÇ ALPARSLAN

We present fast and accurate solutions of large-scale scattering problems involving three-dimensional closed conductors with arbitrary shapes using the multilevel fast multipole algorithm (MLFMA). With an efficient parallelization of MLFMA, scattering problems that are discretized with tens of millions of unknowns are…

• ÖZGÜR SALİH ERGÜL

No abstract yet.

• SELÇUK KUTLUAY

We present a novel hierarchical partitioning strategy for the efficient parallelization of the multilevel fast multipole algorithm (MLFMA) on distributed-memory architectures to solve large-scale problems in electromagnetics. Unlike previous parallelization techniques, the tree structure of MLFMA is distributed among…

• ÖZGÜR SALİH ERGÜL