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Propagation of wave in a cylindrical waveguide filled with hyperbolic negative index medium
Author(s) -
Bhardwaj Abhinav,
Srivastava Kumar Vaibhav,
Ramakrishna S. Anantha
Publication year - 2020
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32460
Subject(s) - cutoff frequency , bessel function , waveguide , transverse plane , optics , physics , permittivity , cutoff , wave propagation , metamaterial , propagation constant , mathematical analysis , mathematics , dielectric , optoelectronics , engineering , quantum mechanics , structural engineering
A co‐axial waveguide is filled with an anisotropic hyperbolic medium that has a radial negative component of the tensorial permittivity and permeability. This waveguide has no cutoff frequency for propagating transverse electric and transverse magnetic modes. These modes of propagation are described by Bessel functions of first and second kinds (Neumann function) with an imaginary order. This feature of below cutoff propagation is useful for miniaturizing the size of the waveguide. Further, the double negative character of the radial components of the permittivity and permeability also occasion a better impedance match of the waveguide to free space. Such waveguide can be projected to be useful as miniaturized efficient coupler and imaging probes.