Homogenization of 3-D-connected and nonconnected wire metamaterials

Silveirinha, Mário G.; Fernandes, Carlos A.

doi:10.1109/tmtt.2005.845128

Cited by 140 publications

(165 citation statements)

References 19 publications

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“…It should be noted that, for dual values of m r and 1 r , employing MNZ media allows to use thinner slabs with respect to ENZ media, although, by comparing (14) and (17), in the former case the attenuation constant is larger (hence the beam is less directive) by a factor p 2. It is also worth noting that the possible use of high-index (EVL or MVL) media reduces considerably the normalised thickness of the slab h/l 0 .…”

mentioning

confidence: 99%

Combinations of low/high permittivity and/or permeability substrates for highly directive planar metamaterial antennas

Lovat

Burghignoli

Capolino

et al. 2007

IET Microw. Antennas Propag.

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An investigation of planar metamaterial antennas consisting of grounded metamaterial substrates with low and/or high values of the electric permittivity and/or the magnetic permeability excited by dipole sources is presented. Their performances are characterised in terms of their capability to radiate high levels of power density in the broadside direction and to produce narrow pencil beams pointing at broadside with high directivity. To achieve a high directivity, a pair of weakly attenuated cylindrical leaky waves is excited along the metamaterial substrate; sufficient conditions are established for the existence of such leaky waves in terms of the values of the substrate permittivity and permeability. Approximate closed-form expressions are derived for the phase and attenuation constants of the leaky waves. Numerical results are given in order to illustrate the radiative features of this class of antennas and to validate the theoretical analysis.

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mentioning

confidence: 99%

Combinations of low/high permittivity and/or permeability substrates for highly directive planar metamaterial antennas

Lovat

Burghignoli

Capolino

et al. 2007

IET Microw. Antennas Propag.

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“…In the last years, a large number of studies have demonstrated that the frequency dependence given in (1) can be assumed to model the effective electric permittivity of artificial structures consisting of a metallic wire mesh [43][44][45][46][47][48]. Specifically, it has been experimentally verified that an array of thin wires behaves like the metal which constitutes the wires, but with a lower plasma frequency [43][44][45][46][47][48].…”

Section: Metal Foams Analytical Model: An Effective Medium Approachmentioning

confidence: 99%

“…Specifically, it has been experimentally verified that an array of thin wires behaves like the metal which constitutes the wires, but with a lower plasma frequency [43][44][45][46][47][48].…”

Section: Metal Foams Analytical Model: An Effective Medium Approachmentioning

confidence: 99%

Metal Foams for Electromagnetics: Experimental, Numerical and Analytical Characterization

Catarinucci¹,

Monti²,

Tarricone³

2012

PIER B

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Abstract-This work focuses on the use of metal foams, a relatively new class of materials, for high added-value electromagnetic (EM) shields. First, the Shielding Effectiveness (SE) of aluminum foam slabs is experimentally evaluated, showing very good shielding properties. Successively, accurate numerical models of metal foams are proposed and used in a proprietary Variable-Mesh Parallel Finite Difference Time Domain code, in order to characterize the EM properties of slabs of such materials. Afterwards, a third approach is adopted. It consists in the application of the effective medium theories in order to obtain an analytical EM model of the metal foams; this way, their SE can be evaluated with a negligible computational time by using common mathematical tools. Finally, a methodology to design/analyze customized metal foams for EM shield applications is suggested. It takes advantage from the joint use of the numerical and analytical presented approaches, thus allowing a computationally efficient evaluation of SE and other electromagnetic properties of metal foams. Results demonstrate the suitability of metal foam structures for effective EM shielding in many industrial applications, as well as the accuracy of the proposed analytical and numerical approaches.

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“…1) is much smaller than the wavelength of the the incident electromagnetic wave, the medium can be homogenized. Such a homogenization was performed in [11] and the relative effective permittivity dyadic describing the medium is of the form …”

Section: A Numerical Modelmentioning

confidence: 99%

“…The wire mesh has a period a, and the wires have radius r w . It has been shown that a general wire medium (single, double or triple) suffers from a spatial dispersion [10], [11], nevertheless it can be considered as an isotropic negative permittivity medium near the plasma frequency [12]. A spatial dispersion can be defined as a nonlocal dispersive behavior of the material, i.e., the constitutive permittivity and permeability tensors depend not only on the frequency, but also on the spatial derivatives of the electric and magnetic field vectors or, for plane electromagnetic waves, on the wave-vector components determining the direction of propagation.…”

Section: Introductionmentioning

confidence: 99%