A hybrid optimization method to analyze metamaterial-based electrically small antennas

Aycan Erentok; Richard W. Ziolkowski

doi:10.1109/TAP.2007.891553

A hybrid optimization method to analyze metamaterial-based electrically small antennas

Aycan Erentok, Richard W. Ziolkowski

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

56 Scopus citations

Abstract

A model of an idealized radiating system composed of an electrically small electric dipole antenna enclosed in an electrically small multilayered metamaterial shell system is developed analytically. The far-field radiation characteristics of this system are optimized using a GA-MATLAB based hybrid optimization model. The optimized-analytical model is specifically applied to a spherical glass shell filled with a "cold plasma"epsilon-negative (ENG) medium. These analytical results are confirmed using ANSOFT HFSS and COMSOL Multiphysics simulations; these numerical results include input impedance and overall efficiency values not available with the analytical model. The optimized-analytical model is also used to achieve electrically small nonradiating metamaterial-based multilayered spherical shell designs. The optimized shell properties are exploited to obtain multiband radiating and nonradiating response characteristics. Dispersion properties of the ENG materials are also included in all the analytical models; the bandwidth characteristics of these systems are discussed.

Original language	English (US)
Pages (from-to)	731-741
Number of pages	11
Journal	IEEE Transactions on Antennas and Propagation
Volume	55
Issue number	3 I
DOIs	https://doi.org/10.1109/TAP.2007.891553
State	Published - Mar 2007

Keywords

Electrically small antennas
Genetic algorithm (GA)
Metamaterials
Optimization methods

ASJC Scopus subject areas

Electrical and Electronic Engineering

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10.1109/TAP.2007.891553

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title = "A hybrid optimization method to analyze metamaterial-based electrically small antennas",

abstract = "A model of an idealized radiating system composed of an electrically small electric dipole antenna enclosed in an electrically small multilayered metamaterial shell system is developed analytically. The far-field radiation characteristics of this system are optimized using a GA-MATLAB based hybrid optimization model. The optimized-analytical model is specifically applied to a spherical glass shell filled with a {"}cold plasma{"}epsilon-negative (ENG) medium. These analytical results are confirmed using ANSOFT HFSS and COMSOL Multiphysics simulations; these numerical results include input impedance and overall efficiency values not available with the analytical model. The optimized-analytical model is also used to achieve electrically small nonradiating metamaterial-based multilayered spherical shell designs. The optimized shell properties are exploited to obtain multiband radiating and nonradiating response characteristics. Dispersion properties of the ENG materials are also included in all the analytical models; the bandwidth characteristics of these systems are discussed.",

keywords = "Electrically small antennas, Genetic algorithm (GA), Metamaterials, Optimization methods",

author = "Aycan Erentok and Ziolkowski, {Richard W.}",

note = "Funding Information: Manuscript received March 22, 2006; revised September 14, 2006. This work was supported in part by DARPA under Contract HR0011-05-C-0068. The authors are with the Department of Electrical and Computer Engineering, The University of Arizona, Tucson, AZ 85721-0104 USA (e-mail: erentoka@ece.arizona.edu; ziolkowski@ece.arizona.edu). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TAP.2007.891553",

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N2 - A model of an idealized radiating system composed of an electrically small electric dipole antenna enclosed in an electrically small multilayered metamaterial shell system is developed analytically. The far-field radiation characteristics of this system are optimized using a GA-MATLAB based hybrid optimization model. The optimized-analytical model is specifically applied to a spherical glass shell filled with a "cold plasma"epsilon-negative (ENG) medium. These analytical results are confirmed using ANSOFT HFSS and COMSOL Multiphysics simulations; these numerical results include input impedance and overall efficiency values not available with the analytical model. The optimized-analytical model is also used to achieve electrically small nonradiating metamaterial-based multilayered spherical shell designs. The optimized shell properties are exploited to obtain multiband radiating and nonradiating response characteristics. Dispersion properties of the ENG materials are also included in all the analytical models; the bandwidth characteristics of these systems are discussed.

AB - A model of an idealized radiating system composed of an electrically small electric dipole antenna enclosed in an electrically small multilayered metamaterial shell system is developed analytically. The far-field radiation characteristics of this system are optimized using a GA-MATLAB based hybrid optimization model. The optimized-analytical model is specifically applied to a spherical glass shell filled with a "cold plasma"epsilon-negative (ENG) medium. These analytical results are confirmed using ANSOFT HFSS and COMSOL Multiphysics simulations; these numerical results include input impedance and overall efficiency values not available with the analytical model. The optimized-analytical model is also used to achieve electrically small nonradiating metamaterial-based multilayered spherical shell designs. The optimized shell properties are exploited to obtain multiband radiating and nonradiating response characteristics. Dispersion properties of the ENG materials are also included in all the analytical models; the bandwidth characteristics of these systems are discussed.

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A hybrid optimization method to analyze metamaterial-based electrically small antennas

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