Journal ArticleDOI
Direct calculation of permeability and permittivity for a left-handed metamaterial
TLDR
In this article, an electromagnetic metamaterial was fabricated and demonstrated to exhibit a "left-handed" (LH) propagation band at microwave frequencies, a situation never observed in naturally occurring materials or composites.Abstract:
Recently, an electromagnetic metamaterial was fabricated and demonstrated to exhibit a “left-handed” (LH) propagation band at microwave frequencies. A LH metamaterial is one characterized by material constants—the permeability and permittivity—which are simultaneously negative, a situation never observed in naturally occurring materials or composites. While the presence of the propagation band was shown to be an inherent demonstration of left handedness, actual numerical values for the material constants were not obtained. In the present work, using appropriate averages to define the macroscopic fields, we extract quantitative values for the effective permeability and permittivity from finite-difference simulations using three different approaches.read more
Citations
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Electromagnetic wave transmission through subwavelength metallic meshes sandwiched between split rings
TL;DR: In this article, the authors report the extraordinary enhanced transmission of microwaves through a subwavelength metallic mesh sandwiched between two identical split-ring arrays, which demonstrates some unique electromagnetic (EM) characteristics.
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Tunable and reconfigurable mechanical transmission-line metamaterials via direct active feedback control
TL;DR: In this article, the authors consider the problem of using active feedback control to create tunable and reconfigurable mechanical metamaterials capable of supporting unconventional wave propagation mechanisms and design control algorithms in order to achieve desired constitutive parameters for the metammaterial in closed loop.
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Scattering properties of an impedance-matched, ideal, homogeneous, causal “left-handed” sphere
TL;DR: In this paper, the plane-wave scattering properties of a sphere of material having an ideal, homogeneous, and causal permittivity e(f), and permeability μ(f) were investigated through detailed three-dimensional finite-difference time-domain, method-of-moments, and series-solution simulations.
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Manipulate light polarizations with metamaterials: From microwave to visible
TL;DR: In this paper, the authors presented a 4 × 4 version transfer matrix method (TMM) to study the scatterings by an anisotropic metamaterial of EM waves with arbitrary propagating directions and polarizations.
Journal Article
A comparative study on different types of metamaterials for enhancement of microstrip patch antenna directivity at the Ku-band (12 GHz)
TL;DR: Four different metamaterial types are used as a flat lens in front of the MPA, respectively, which are tuned to 12 GHz (Ku-band) resonance frequency, and it can be decided which meetamaterial is more proper for antenna directivity enhancement at this band.
References
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Journal ArticleDOI
The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ
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Magnetism from conductors and enhanced nonlinear phenomena
TL;DR: In this paper, it was shown that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu/sub eff/, which can be tuned to values not accessible in naturally occurring materials.
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Composite Medium with Simultaneously Negative Permeability and Permittivity
TL;DR: A composite medium, based on a periodic array of interspaced conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with simultaneously negative values of effective permeability and permittivity varepsilon(eff)(omega).
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Effective response functions for photonic bandgap materials
TL;DR: In this article, an effective description for a metalodielectric photonic bandgap (PBG) material was developed for a semi-infinite and slab observables.