Journal
WAVES IN RANDOM AND COMPLEX MEDIA
Volume 32, Issue 2, Pages 641-662Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17455030.2020.1793029
Keywords
Electromagnetic scattering; multilayer media with two rough surfaces; flat subsurface approximation; applicable condition
Categories
Funding
- National Natural Science Foundation of China [41571333]
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The subsurface profile is a crucial parameter for constructing an accurate scattering model of multilayer media. This paper investigates the conditions for using the flat subsurface approximation by comparing the scattering fields of a rough subsurface model and a flat subsurface model. The results help determine the applicable conditions for the flat subsurface approximation.
Subsurface profile is one of the crucial parameters to construct an accurate scattering model of multilayer media. Due to the difficulties of tracing the subsurface profile, the subsurface is often assumed to be flat to simplify the scattering model. The validity of this flat subsurface approximation, however, was examined only by empirical data, and its applicable condition was barely provided in the literatures. The accuracy of multilayer scattering model can be significantly affected without a proper applicable condition. In this paper, two models are investigated: a three-layer media with a rough subsurface (exact geometry model) and a three-layer media with a flat subsurface (approximate geometry model). The scattered fields of these two models are solved by using the Method of Moment combined with the Kirchhoff Approximation. The results indicate that the fields are strongly dependent on the parameters of the roughness of surfaces, the mean thickness of medium, and the angle of incidence. These parameters are assigned with different values to quantitatively evaluate their impacts on the difference in bistatic and backscattering scattering coefficients between the approximate and exact geometry models. Finally, the applicable conditions of the flat subsurface approximation are determined by limiting this difference within 1 dB.
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