Abstract
Sub-wavelength resonances known to exist in isolated metamaterial-based structures of circular cylindrical shape are investigated with the purpose of determining whether the individual resonances are retained when several of such resonant structures are grouped to form a new structure. To this end, structures consisting of 1, 2 and 4 sets of metamaterial-based concentric cylinders excited by an electric line current are analyzed numerically. It is demonstrated that these structures recover the resonances of the individual structures even when the cylinders are closely spaced and the new structure is thus electrically small. The investigation is conducted through a detailed analysis of the electric near-field distribution as well as the radiation resistance in those cases where the individual structures are made of simple dielectric materials in conjunction with simple, but lossy and dispersive, metamaterials.
Highlights
The field of metamaterials (MTMs) has experienced significant scientific advances in recent years, and numerous applications within the microwave [1,2,3] and the optical [4] frequency regions have been devised
It was shown in [9] that an isolated set of concentric circular MTM-based cylinders excited by a nearby electric line current (ELC) possesses sub-wavelength resonances where the excitation of specific modes is found to lead to large radiated power for constant ELC
We investigate whether these resonances of the individual 1-cylinder structures exist, and under which conditions when several cylindrical structures are grouped to form a new structure
Summary
The field of metamaterials (MTMs) has experienced significant scientific advances in recent years, and numerous applications within the microwave [1,2,3] and the optical [4] frequency regions have been devised. Among the numerous reported applications of these MTMs, specific attention has been devoted to their potential of providing sub-wavelength resonant structures of various canonical shapes [5,6,7,8,9,10,11,12,13,14] either when used alone or in combination with double-positive (DPS) materials, which possess a positive real part of permittivity and permeability It was shown in [9] that an isolated set of concentric circular MTM-based cylinders excited by a nearby electric line current (ELC) possesses sub-wavelength resonances where the excitation of specific modes is found to lead to large radiated power for constant ELC. The present work is an extension of [18], and in comparison, includes both a full account of the HFSS model as well as additional near-field investigations
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