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International Journal of Antennas and Propagation
Volume 2007, Article ID 97481, 10 pages
http://dx.doi.org/10.1155/2007/97481
Research Article

Analyses of a Dipole Antenna Loaded by a Cylindrical Shell of Double Negative (DNG) Metamaterial

Department of Electrical Engineering, University of South Carolina, Swearingen Engineering Center, SC 29208, Colombia

Received 1 December 2006; Accepted 3 August 2007

Academic Editor: Karu Esselle

Copyright © 2007 Khan M. Z. Shams and Mohammod Ali. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The current distribution, input impedance, and radiation pattern of a cylindrical dipole antenna enclosed by a thin cylindrical shell of double negative (DNG) metamaterial are computed using the piecewise sinusoidal Galerkin formulation. In the presence of the DNG shell, the dipole antenna exhibits three interesting characteristics. The input impedance shows potentials for wide bandwidth due to the relative insensitivity of the impedance with frequency. Within specific ranges of DNG material parameter values, the dipole shows resonance at much lower frequencies than its resonant frequency in free space. The dipole does not show change in the direction of the principal beam nor does it show signs of beam splitting and side lobes even when the antenna length approaches one and a half wavelength.