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http://dx.doi.org/10.5515/KJKIEES.2014.25.6.664

Scattering Model of TM Polarized Electromagnetic Wave by Finite I-Shaped Metamaterial Array Based on Surface Current Model  

Jang, Ji-Woong (Department of Electronic Engineering, Inha University)
Lee, Haeseung (School of Electrical & Electronic Engineering, Yonsei University)
Koh, Il-Suek (Department of Electronic Engineering, Inha University)
Seo, Ilsung (Agency for Defence Development)
Lee, Yongshik (School of Electrical & Electronic Engineering, Yonsei University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.25, no.6, 2014 , pp. 664-670 More about this Journal
Abstract
Generally, the properties of metamaterials are analyzed based on the infinite array of the unit cells. In real application of the metamaterial, however, the array has to be finite. Hence, it is important that a method can analyze the effect of the finite array of the metamaterial. In this paper, a model is proposed which can calculate the scattering by a large-size finite array of an I-shaped metamaterial without a full-wave simulation. The proposed model is based on the surface current estimation of each unit cells. The ratio of the current distribution on a finite array of the metamaterial to that of the infinite array of the same metamaterial for a TM polarized incident wave is approximated as a quartic polynomial. The coefficients of the polynomial are a function of the physical dimension of the metallic patch. Hence, the current distribution of the finite metamaterial can be estimated based on the proposed polynomial and the current of the infinite array. The scattered field is calculated by using the surface current model. The proposed model is numerically and experimentally verified by comparing calculated and measured RCS(Radar Cross Section) data.
Keywords
Metamaterials; Finite array; Scattering;
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