Curved oversized EM waveguides: adiabatic modes and parabolic equation

Author

Popov, Alexei V. ; Zhu, Ning Yan

Author_Institution

IZMIRAN, Moscow, Russia

fYear

1999

fDate

1999

Firstpage

220

Lastpage

231

Abstract

Two alternative representations of the wave field in a curved oversized electromagnetic waveguide are discussed: adiabatic modes, matched to the local value of the axis curvature, and full-wave solution of the vectorial parabolic equation. The latter, although being asymptotically equivalent to the adiabatic mode theory, displays additional diffraction effects. A simplified complex WKB analysis is performed in order to estimate residual mode conversion in smooth waveguide bends. Application of the vectorial PE to radio propagation in tunnels is illustrated with numerical examples

Keywords

WKB calculations; circular waveguides; electromagnetic wave diffraction; radiowave propagation; waveguide discontinuities; waveguide theory; adiabatic modes; axis curvature; curved oversized EM waveguides; diffraction effects; full-wave solution; numerical examples; parabolic equation; radio propagation; residual mode conversion; simplified complex WKB analysis; smooth waveguide bends; tunnels; vectorial PE; vectorial parabolic equation; wave field; Attenuation; Boundary conditions; Displays; Equations; Impedance; Optical fibers; Optical propagation; Optical waveguide theory; Optical waveguides; Planar waveguides;

fLanguage

English

Publisher

ieee

Conference_Titel

Day on Diffraction, 1999. Proceedings. International Seminar

Conference_Location

St. Petersburg

Print_ISBN

5-7997-0156-9

Type

conf

DOI

10.1109/DD.1999.816203

Filename

816203