Abstract-Guided-wave propagation in chiral H-guides is analyzed, using a building-block approach. In a first stage, a 2D chiral parallel-plate waveguide is studied using a lossless frequency dispersion model for the optically active medium, where the constitutive chiral parameter is assumed to be dependent on the gyrotropic parameter. In the second stage, the mode matching technique and the transverse resonance method are used to characterize the 3D structure. A full parametric study is presented for a fixed frequency. The operational and dispersion diagrams for the chiral H-guide are presented. By replacing the common isotropic slab with a chiral slab, chirality provides an extra degree of freedom in the design of new devices.
The use of -negative materials with a plasma-like scalar permittivity allows us to achieve this goal, by working in the frequency range where the relative permittivity is lower than one in absolute value, and by adopting suitably low values for the slab width and for the metal-plate spacing. Parametric studies have been presented that illustrate the required thicknesses of the metamaterial layer at different frequencies and the attainable FBW of unimodal propagation.Although encouraging, the results of the present investigation are based on a rather idealized metamaterial model that disregards its actual implementation. Realistic approximations of -negative metamaterials based, e.g., on arrays of wires embedded in a host dielectric require that anisotropy and also spatial dispersion be taken into account in a homogenized equivalent model [13]. A study based on such more refined models and on full-wave simulations of actual metamaterial structures will be the subject of future work.
Abstract-This paper addresses guided wave propagation in threedimensional open omega waveguides. The analysis uses a mode matching technique, is focused on the discrete modes and includes both guidance and leakage behavior. It is shown that, in some ranges of operation, the discrete surface modes turn into leaky modes due to TE-TM mode coupling, an effect already known for isotropic dielectric waveguides. The numerical results show the influence of the medium and geometrical parameters on the attenuation and phase constants of these leaky modes.
The occurrence of semileaky waves in dielectric chirowaveguides is investigated. It is shown that a thinfilm dielectric chiroslabguide with an achiral superstrate and in which both the film and substrate are chiral can support semileaky modes radiating energy into the substrate, provided that the chirality parameters are properly chosen.
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