Analysis of Scattering From Arbitrary Configuration of Cylindrical Objects Using Hybrid Finite-Difference Mode-Matching Method

Abstract

Abstract-This paper presents a new hybrid finite-difference frequency domain -mode-matching method (FDFD-MM) for the analysis of electromagnetic wave scattering from configuration of metallic or dielectric cylindrical posts with arbitrary cross-section. In our approach each scatterer is treated as an effective circular cylinder represented by impedance matrix defined in its local coordinate system. In order to obtain the scattering parameters of arbitrary configuration of objects in global coordinate system an analytical iterative scattering procedure (ISP) is applied. This work is an extension of our previously published results, where our consideration were limited to two dimensional (2D) problems with TM excitation. In this paper, we extended our analysis to two-and-a-half dimensional (2.5D) problems. The accuracy of the proposed method is presented and discussed. To verify our approach some numerical examples are presented. The obtained results are compared with the results published in literature and the ones obtained from own measurements and commercial software.

Hybrid Technique for the Analysis of Scattering From Periodic Structures Composed of Irregular Objects

“…In the case of post from Fig. 3(a) the variation of field along z-axis is assumed as e jk z,p z and region I is discretized only in z-const plane [29]. On the other hand, when the post from Fig.…”

“…For objects with regular geometry the impedance matrix can be determined utilizing analytical techniques [22]. However, in the case of objects with irregular shape we utilize finite difference-frequency domain (FDFD) technique [28][29][30] which will be described in the next section. Since, the Z-matrix is known it can be utilized to determine the transmission matrix T of the object:…”

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