Investigation on Metaradiator based on Metasurface

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Sarawuth Chaimool
Tanan Hongnara
Prayoot Akkaraekthalin


Three unusual electromagnetics properties of metasurface namely negative permittivity (ENG), negative permeability (MNG), and near-zero refraction index (NZI) have been investigated. These properties are obtained by coupling effect of the combination between fractal fishnet structure and closed ring resonator on different sides of unit cell. To better understand the characteristics of metasurface, the metasurface as a superstrate/cover placed atop a conventional dipole at a small distance, which called metaradiator, has been studied and demonstrated. Moreover, in order to understand and explain clearly the unusual behaviors of metasurface, the robust retrieval method and the generalized sheet transition conditions have been applied to extract effective material properties. Numerical and simulated results show three different radiation patterns of metaradiator are strongly affected from metasurface within the entire band.

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