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The propagation characteristics of rectangular waveguides filled with inhomogeneous double‐negative dielectrics using a semianalytical method
Author(s) -
Weng Qianru,
Lin Qian,
Wu Haifeng
Publication year - 2021
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1002/jnm.2860
Subject(s) - dielectric , cutoff , wavenumber , cutoff frequency , permittivity , eigenvalues and eigenvectors , transverse plane , dispersion (optics) , optics , computational physics , materials science , dielectric permittivity , physics , quantum mechanics , optoelectronics , structural engineering , engineering
In this paper, we carry out the calculation of eigenvalues including cutoff wavenumbers and propagation constants in rectangular waveguides filled with inhomogeneous double‐negative (DNG) dielectrics whose permittivity varies along one transverse direction by using a semianalytical approach. Eigenequations for waveguides containing arbitrary continuously or discontinuously varying dielectrics are formulated by the semianalytical approach. We examine several representative inhomogeneous DNG dielectric distributions. When comparing these results with those of waveguides containing inhomogeneous double‐positive (DPS) dielectrics with same distribution profiles, we find the dielectric and geometric dependence of the cutoff wavenumbers to be quite different. Moreover, the dispersion signs of the TE/LSE modes might be changed by partially filling the waveguides with DNG dielectrics, which is caused by the opposite directions of energy transport in DPS and DNG dielectrics.