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Soliton-like nonlinear SPPs have shown to posses intensity dependent propagation characteristics. Two different dispersion relations with arbitrary parameters being input field intensity and position of soliton-like peak were derived and coupled using self-consistent calculations to avoid arbitrary parameters in order to study exact propagation characteristics of nonlinear SPP supported by a linear–metal/nonlinear slab waveguide. It is observed that the position of soliton-like peak in nonlinear medium has significant contribution in determining dispersion characteristics of nonlinear SPP. The propagation properties and mode profiles of nonlinear SPP obtained could help in exploring further possibilities of exciting and guiding SPP efficiently in nanoscale waveguides using nonlinear substrate. [ABSTRACT FROM AUTHOR]

The novel folded substrate-integrated waveguide (FSIW) is 50% narrower than the substrate-integrated waveguide, but both have similar propagation characteristics. This paper derives the analytical formulas of propagation and cutoff characteristics of the FSIW, as well as the formulas to calculate the width and gap of the central metal septum. Very good agreements (<2% error) are observed among the results of the theoretical formulas, numerical simulations, and hardware experiments over wide frequency and parameter ranges. [ABSTRACT FROM AUTHOR]

Experimental results for the demonstration of backward-wave or double-negative (DNG) propagation in waveguide technology combining inductive windows and split-ring resonators are presented and discussed in depth. A novel segmented prototype has been designed, fabricated, and measured, thus allowing the analysis and discussion of different length structures. The experimental characterization proves the DNG nature of the devices by comparing the phase of the transmission coefficient S21 for different length structures. Dielectric and metallic losses linked to the resonators also limit the transmission levels of these very compact structures in the longitudinal dimension, and the sources of such losses are interpreted through the comparison of measured results with full-wave electromagnetic simulations. [ABSTRACT FROM AUTHOR]

Describes a laboratory model designed to investigate radio wave propagation in the perturbed environment of the earth-ionosphere waveguide. Properties of Maxwell's equations involved in the construction of the model; Overview on the problem; Electromagnetic models; Conclusions.