Scattering of an electromagnetic wave from a planar waveguide structure with a slightly 2D random surface |
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Authors: | T Kawanishi H Ogura Z L Wang |
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Institution: |
a Department of Electronics and Communication, Kyoto University, Kyoto, Japan
b Radio Atmospheric Science Center, Kyoto University, Kyoto, Japan |
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Abstract: | This paper deals with the scattering of an electromagnetic (EM) wave from a waveguide structure with a slightly rough surface. The waveguide structure is a dielectric film on a planar, perfectly conductive surface, and the top of the film is a two-dimensional (2D) homogeneous Gaussian random surface. The treatment is based on the stochastic functional theory where the random EM field is represented in terms of a Wiener - Hermite functional of the random surface. Numerical calculations show that enhanced backscattering and cross-polarization occur, but that no enhanced satellite peak appears for a 2D random surface, in contrast to the case of a 1D surface. The enhanced backscattering is caused by the interference of two double-scattering processes and is attributed to the existence of guided waves in the scattering structure. |
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