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Guidance and Leakage Behavior of Uniaxial Ridge Waveguides

Topa, A. ; Paiva, C. R. ; Barbosa, A.

Journal of Electromagnetic Waves and Applications Vol. 23, Nº 13, pp. 1675 - 1684, September, 2009.

ISSN (print): 1569-3937
ISSN (online): 0920-5071

Journal Impact Factor: 3,134 (in 2008)

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This paper addresses the guided-wave propagation in an
open uniaxial ridge waveguide. The analysis is focused on the discrete modes, although including both guidance and leakage behavior. It is shown that, beyond a certain critical frequency, the surface guided modes may turn into leaky modes, due to the TE-TM mode coupling at the waveguide lateral boundaries. The numerical results were obtained using a conventional mode matching technique with a finite number of surface waves in each region. The results obtained for the guided modes are validated by comparison with those obtained through a more accurate analysis. The influence of the anisotropy and the geometrical parameters on the attenuation and phase constants of the leaky modes is shown.