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Propagation characteristics of composite nonradiative dielectric waveguides considering dielectric and OHMIC losses

Complex propagation characteristics of composite nonradiative dielectric waveguides (NRD) are presented. Dielectric and ohmic losses are considered in this hybrid mode analysis based on the frequency-domain transmission-line matrix approach. Numerical results of mode dispersion characteristics indicate that a class of complex modes in both lossless and lossy cases may be supported in the composite dielectric structures under certain conditions. It is further confirmed that a single mode transmission becomes somehow impossible in the composite high-permittivity NRD-guides involving air gaps. Some interesting phenomenons such as the vortical mode pattern are discussed.