Impedance boundary conditions for statistically rough surfaces
Applied Scientific Research, Section B(1960)
摘要
Summary It is shown that for an electromagnetic field incident on a perfectly conducting surface having small geometrical irregularities
which are distributed at random but in a statistically uniform and isotropic manner, the boundary condition can be replaced
by a generalized impedance condition applied at a neighbouring mean surface. The surface impedance is a tensor function of
the direction at which the field is incident as well as of the statistical properties of the irregularities, but simplifies
in certain particular cases. Although the detailed analysis is carried out for a mean surface which is flat, the boundarycondition
is applicable to a curved surface providing the radii of curvature are large in comparison with the wavelength. It is believed
that this approach is of value in studying the effect of minor surface roughnesses on the scattering of electromagnetic waves.
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关键词
boundary condition,electromagnetic waves,electromagnetic field,surface roughness
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