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Materials 2015, 8(8), 4790-4804; doi:10.3390/ma8084790

A Near Zero Refractive Index Metamaterial for Electromagnetic Invisibility Cloaking Operation

1
Centre for Space Science, Research Centre Building, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia
2
Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia
*
Author to whom correspondence should be addressed.
Academic Editor: Christof Schneider
Received: 31 May 2015 / Revised: 29 June 2015 / Accepted: 7 July 2015 / Published: 29 July 2015
(This article belongs to the Section Energy Materials)
View Full-Text   |   Download PDF [1014 KB, uploaded 29 July 2015]   |  

Abstract

The paper reveals the design of a unit cell of a metamaterial that shows more than 2 GHz wideband near zero refractive index (NZRI) property in the C-band region of microwave spectra. The two arms of the unit cell were splitted in such a way that forms a near-pi-shape structure on epoxy resin fiber (FR-4) substrate material. The reflection and transmission characteristics of the unit cell were achieved by utilizing finite integration technique based simulation software. Measured results were presented, which complied well with simulated results. The unit cell was then applied to build a single layer rectangular-shaped cloak that operates in the C-band region where a metal cylinder was perfectly hidden electromagnetically by reducing the scattering width below zero. Moreover, the unit cell shows NZRI property there. The experimental result for the cloak operation was presented in terms of S-parameters as well. In addition, the same metamaterial shell was also adopted for designing an eye-shaped and triangular-shaped cloak structure to cloak the same object, and cloaking operation is achieved in the C-band, as well with slightly better cloaking performance. The novel design, NZRI property, and single layer C-band cloaking operation has made the design a promising one in the electromagnetic paradigm. View Full-Text
Keywords: cloak; metamaterial; near zero refractive index (NZRI) cloak; metamaterial; near zero refractive index (NZRI)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Islam, S.S.; Faruque, M.R.I.; Islam, M.T. A Near Zero Refractive Index Metamaterial for Electromagnetic Invisibility Cloaking Operation. Materials 2015, 8, 4790-4804.

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