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      Invisibility Cloaks Modeled by Anisotropic Metamaterials Based on Inductor-capacitor Networks

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          Abstract

          Based on the transformation optics, a novel transmission-line (TL) approach to realize invisibility cloaking using planar anisotropic metamaterials (MTMs) is proposed. The two-dimensional cylindrical cloaks are modeled based on inductor-capacitor (L-C) MTMs networks. The three elements of the constitutive parameters are all allowed to be spatially inhomogeneous which lead to the full parameter realization of a cylindrical cloak. As an example, a cloak working at VHF band is modeled and its invisibility behavior is demonstrated based on the solution of the node voltage distribution. Due to the non-resonant properties of the L-C elements, the broadband characteristic of the proposed cloaks is also evident.

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          Planar negative refractive index media using periodically L-C loaded transmission lines

          G.V. Eleftheriades, P.C. Kremer, A.K. Iyer (2002)
          Article 0 comments Cited 190 times – based on 0 reviews     Review now
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            Overcoming the Diffraction Limit with a Planar Left-Handed Transmission-Line Lens

            Anthony Grbic, George Eleftheriades (2004)
            We report experimental results at 1.057 GHz that demonstrate the ability of a planar left-handed lens, with a relative refractive index of -1, to form images that overcome the diffraction limit. The left-handed lens is a planar slab consisting of a grid of printed metallic strips over a ground plane, loaded with series capacitors (C) and shunt inductors (L). The measured half-power beamwidth of the point-source image formed by the left-handed lens is 0.21 effective wavelengths, which is significantly narrower than that of the diffraction-limited image corresponding to 0.36 wavelengths.
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              Full-wave simulations of electromagnetic cloaking structures

              David Smith, Steven A. Cummer, Bogdan-Ioan Popa … (2006)
              Based on a coordinate transformation approach, Pendry {\it et al.} have reported electromagnetically anisotropic and inhomogeneous shells that, in theory, completely shield an interior structure of arbitrary size from electromagnetic fields without perturbing the external fields. We report full-wave simulations of the cylindrical version of this cloaking structure using ideal and nonideal (but physically realizable) electromagnetic parameters in an effort to understand the challenges of realizing such a structure in practice. The simulations indicate that the performance of the electromagnetic cloaking structure is not especially sensitive to modest permittivity and permeability variations. This is in contrast to other applications of engineered electromagnetic materials, such as subwavelength focusing using negative refractive index materials. The cloaking performance degrades smoothly with increasing loss, and effective low-reflection shielding can be achieved with a cylindrical shell composed of an eight (homogeneous) layer approximation of the ideal continuous medium.
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                Author and article information

                Journal
                Publication date Created: 31 August 2009
                Publication date Updated: 2009-10-11
                Article
                DOI: 10.1109/LAWP.2009.2034675
                ArXiV ID: 0909.0076
                SO-VID: a626ddab-9eac-41d4-881e-b98ecff4ae43
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                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Comments 4 pages, 5 figures, accepted by IEEE Antennas and Wireless Propagation Letters
                Categories physics.class-ph

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