Abstract
In this paper, a periodic dielectric/metallic rod is located in a circular waveguide to obtain left-handed operation. Two geometries of the dielectric/metallic rod are proposed and examined. The dispersion characteristics of the investigated waveguides are obtained using a surface impedance model. Moreover, equivalent circuit models are proposed allowing for calculation of the dispersion characteristics and scattering parameters of the considered waveguide structures. The numerical results are compared with those obtained from commercial software and from experiment. The obtained results prove the left-handed properties of the investigated structures.
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