Measurement and prediction of helix-loaded chiral composites

Brewitt-Taylor, C.R.; Lederer, P.G.; Smith, F.C.; Haq, Sirajul

doi:10.1109/8.768809

Cited by 44 publications

(20 citation statements)

References 18 publications

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“…As it can be expected, the rotation angle increases with the number density of inclusions and with the sample width, following a nearly linear relation. Similar behavior has been found in other experiments with helices (Brewitt-Taylor et al, 1999) or cranks (Molina-Cuberos et al, 2005). Fig.…”

Section: Wwwintechopencomsupporting

confidence: 89%

“…Several analyses of the chiral effects, by making use of waveguide setup, have been also developed; see for example Brewitt-Taylor et al (1999). In order to test the effect of metallic cranks in waveguide, some samples were initially designed to produce chiral isotropic materials with a resonance frequency at X-band and placed into a section of circular waveguide.…”

Section: Wwwintechopencommentioning

confidence: 99%

See 1 more Smart Citation

Quasi-planar Chiral Materials for Microwave Frequencies

Barba¹,

Cabeceira²,

Garcia-Collado³

et al. 2011

Electromagnetic Waves Propagation in Complex Matter

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Section: Wwwintechopencomsupporting

confidence: 89%

Section: Wwwintechopencommentioning

confidence: 99%

Quasi-planar Chiral Materials for Microwave Frequencies

Barba¹,

Cabeceira²,

Garcia-Collado³

et al. 2011

Electromagnetic Waves Propagation in Complex Matter

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Section: Modal Analysis Using a Causal Dispersive Modelmentioning

confidence: 99%

“…This cannot be considered as a small perturbation, but can however be considered as realistic (see for comparison the results in [17][18][19]). Also, [17] shows that, for chiral materials, at frequencies close to the resonance, losses can be much higher. Furthermore, [18] and [19] show that we can expect high levels of losses when trying to obtain media with ε < 0 and/or µ < 0, by adding metallic inclusions.…”

Section: Modal Analysis Using a Causal Dispersive Modelmentioning

confidence: 99%

Dispersion and Losses in Surface Waveguides Containing Double Negative or Chiral Metamaterials

Canto¹,

Paiva²,

Barbosa³

2011

PIER

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Abstract-In this article the influence of both dispersion and losses on waveguides with metamaterials is investigated. The analysis is focused on surface waveguides (planar interfaces and grounded slabs) containing either double-negative (DNG) or chiral metamaterials. The main goal is to show how the combined effect of material dispersion and losses with the structural dispersion affect the solutions of the modal equations. It is shown that this interplay is essential to obtain a correct modal analysis of these waveguides. Namely, the overall behavior can qualitatively change -so that it is not possible to state that the corresponding lossy case -even when a very small amount of losses is introduced -can be interpreted as a small perturbation of the lossless case.

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“…Chiral materials have been extensively investigated in the past from both the theoretical and the experimental point of view (Jaggard, Mickelson, & Papas, 1979;Lakhtakia, Varadan, & Varadan, 1989;Jaggard et al, 1991;Cory, 1995;Varadan, Ro, & Varadan, 1994;Brewitt-Taylor, 1994;Brewitt-Taylor et al, 1999) in the microwave frequency range. As a matter of fact, very often the theoretical solutions proposed in the literature on chiral media have not considered the possibility of fabrication of such dielectrics in realizable microwave components.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cavity-Backed Antennas with Chiral Substrates and Superstrate Using the Finite Element Method

Bilotti

2004

Electromagnetics

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Recently, advances in material technology permit the realization of chiral materials for employment in multilayer substrate/superstrate configurations with dimensions that are even a small fraction of the wavelength. This capability makes possible the fabrication of integrated circuits and planar antennas with chiral loading materials that are very promising for telecommunication purposes. The recent extension of the finite element variational formulation given by the authors for the analysis of cavity-backed patch antennas with complex loading materials facilitated the study of microwave components with chiral dielectrics and is exploited in this paper to investigate some electrical features of patches with chiral substrates and superstrates. The main result obtained is the reduction of the resonant frequency with an increase in the chirality admittance of the material. This permits the realization of very compact antennas compared with antennas fabricated using solely isotropic materials. An example showing the dimension reduction obtained through the employment of chiral materials is also presented. Finally, the effect of a chiral superstrate on a conventional patch and the mutual coupling between two patches when chiral substrates are used is also presented.

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Measurement and prediction of helix-loaded chiral composites

Cited by 44 publications

References 18 publications

Quasi-planar Chiral Materials for Microwave Frequencies

Quasi-planar Chiral Materials for Microwave Frequencies

Dispersion and Losses in Surface Waveguides Containing Double Negative or Chiral Metamaterials

Analysis of Cavity-Backed Antennas with Chiral Substrates and Superstrate Using the Finite Element Method

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