The synthesis of surface reactance using an artificial dielectric

King, R. W. P.; Thiel, David V.; Park, K.

doi:10.1109/tap.1983.1143071

Cited by 88 publications

(70 citation statements)

References 9 publications

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“…1. It has been known in microwave applications for a long time [2][3][4] as an artificial dielectric, also called rodded medium and quasistatic models of the effective permittivity are available. 5 Recently, some attention to wire media has been paid also in optics ͑e.g., Refs.…”

mentioning

confidence: 99%

Strong spatial dispersion in wire media in the very large wavelength limit

Belov¹,

Marqués

Maslovski³

et al. 2003

Phys. Rev. B

581

401

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It is found that there exist composite media that exhibit strong spatial dispersion even in the very large wavelength limit. This follows from the study of lattices of ideally conducting parallel thin wires ͑wire media͒. In fact, our analysis reveals that the description of this medium by means of a local dispersive uniaxial dielectric tensor is not complete, leading to unphysical results for the propagation of electromagnetic waves at any frequencies. Since nonlocal constitutive relations have been usually considered in the past as a secondorder approximation, meaningful in the short-wavelength limit, the aforementioned result presents a relevant theoretical interest. In addition, since such wire media have been recently used as a constituent of some discrete artificial media ͑or metamaterials͒, the reported results open the question of the relevance of the spatial dispersion in the characterization of these artificial media. Causality imposes that all material media must be dispersive. In most cases this behavior results in local dispersive constitutive relations, i.e., in frequency-dependent constitutive permittivity and permeability tensors. Nonlocal dispersive behavior ͑i.e., spatial dispersion͒, which results in constitutive operators depending also on the spatial derivatives of the mean fields ͑or, for plane electromagnetic waves, on the wave-vector components͒, is usually considered as a small effect, meaningful in the short-wavelength limit. Specifically, spatial dispersion will always appear when the higher-order terms in the series expansion of the constitutive parameters in power series of the dimensionless parameter a/ (a is the lattice constant of the crystal and the wavelength inside the medium͒ are not neglected.

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mentioning

confidence: 99%

Strong spatial dispersion in wire media in the very large wavelength limit

Belov¹,

Marqués

Maslovski³

et al. 2003

Phys. Rev. B

581

401

View full text Add to dashboard Cite

show abstract

“…We have shown the difference between the waveguide mode spectra giving by the conventional model [2] and the new [7] model of wire medium in which the spatial dispersion is taken into account. The mode spectra both for old (local) and new model depend on the angle between wires and coordinate axes.…”

Section: Resultsmentioning

confidence: 99%

“…The medium, formed by a regular lattice of ideally conducting wires with small radii compared to the lattice period and the wavelength is well known for a long time [1,2] and is referred usually as a wire medium or rodded medium. Recently attention to the wire medium was increased due to realization of "left-handed" or "backward-wave" materials [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…It can be used for solution of the boundary-value problems at low frequencies (for dense lattices, when a period of wires is much smaller than wavelength). The model (1,2) takes into account the direction of wires as well as their density and radius. Application of the continuous medium model in solution of the boundary-value problems gives a possibility to display the most general electromagnetic features of the considered structures, which can be studied later on more rigorously.…”

Section: Introductionmentioning

confidence: 99%

“…It was shown in [8], that three-dimensional cubic lattice, formed of three mutually perpendicular wire arrays, can be considered as isotropic artificial plasma, whose scalar permittivity is expressed by formula (2). Recently we have found, that the model (2) becomes incorrect, if the wavevector in wire medium has a component γ parallel to the wires [7].…”

Section: Introductionmentioning

confidence: 99%

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Guided Waves in Uniaxial Wire Medium Slab

Nefedov¹,

Viitanen²

2005

PIER

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Abstract-Guided waves in a wire medium slab are studied. The wire medium is considered as a continuous medium described in terms of uniaxial permittivity dyadic. Nonlocal model of the wire medium, taking into account spatial dispersion, is used in the analysis. Different cases of an arrangement of the wires are considered. Analytic expressions for the fields in unbounded media and numerical solutions for eigenmodes spectrum in wire medium slab are obtained.Comparison of the results given by old (local) and new model of wire medium is presented.

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Artificial Magnetic Conductor

Díaz

Clavijo

2005

Encyclopedia of RF and Microwave Engineering

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The artificial magnetic conductor (AMC) is a textured ground plane that presents a high impedance to incident waves and nearby horizontal antennas over a prescribed frequency range. In addition, it suppresses the propagation of both transverse electric (TE) and transverse magnetic (TM) surface waves, thus concentrating the radiation from a horizontal antenna into the upper half‐space. The resulting reduced backlobe and reduced mutual coupling to any other antennas on the same surface, combined with the high input impedance, make the AMC an ideal gain‐enhancing ground plane for ultrathin antennas. It is shown that these desirable features of are derived from the AMC's effective anisotropic magnetodielectric constitutive properties. Analysis and design approaches are given that enable the control of these properties according to the desired frequency and bandwidth of operation and the amount of surface‐wave suppression needed. Examples of the latest applications of AMC are given, as well as a brief history of its inception.

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The synthesis of surface reactance using an artificial dielectric

Cited by 88 publications

References 9 publications

Strong spatial dispersion in wire media in the very large wavelength limit

Strong spatial dispersion in wire media in the very large wavelength limit

Guided Waves in Uniaxial Wire Medium Slab

Artificial Magnetic Conductor

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