Analytical and Numerical Investigation of Radiation Enhancement by Anisotropic Metamaterial Shells

This paper presents analytical and numerical investigations of a 3D cylindrical metamaterial shell possessing a cylindrically anisotropic permeability that is excited by a finite-sized electric line source. A comprehensive field analysis of the system reveals that the compact metamaterial shell exhi...

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Bibliographic Details
Published inIEEE access Vol. 8; pp. 2983 - 2994
Main Authors Kumar, R. Aneesh, Pollock, Justin G., Saha, Chinmoy, Iyer, Ashwin K.
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Anisotropic
Anisotropic magnetoresistance
Anisotropy
Antenna radiation patterns
Antennas
Cylindrical shells
Dispersion
Magnetic materials
metamaterial
Metamaterials
power ratio
Q factors
radiation enhancement
Resonance
resonance condtion
Tensors
Three-dimensional displays
Two dimensional displays
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Summary:This paper presents analytical and numerical investigations of a 3D cylindrical metamaterial shell possessing a cylindrically anisotropic permeability that is excited by a finite-sized electric line source. A comprehensive field analysis of the system reveals that the compact metamaterial shell exhibits resonances akin to those observed in isotropic 2D cylindrical metamaterial structures, which may be used to enhance the radiated power of a nearby antenna. An analytical resonance condition that relates the dimensions of the cylindrical shell to its anisotropic effective-medium parameters is shown to be accurate in predicting the resonances of 2D and 3D metamaterial shells obtained using full-wave simulations. The effects of anisotropy and finite shell/antenna height on the system's near-fields, radiation patterns, and power-ratio enhancements are explored. It is shown through both theory and simulations that the condition for resonance is largely independent of shell/antenna height but that the quality factor reduces dramatically as these heights approach electrically small values. Also, a dispersion and loss analysis assuming Lorentz model is carried out, which indicates that practical metamaterial losses do not significantly degrade the power enhancement.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2962737