【摘 要】
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Electromagnetic scattering from targets situated in half space is solved by applying fast inhomogeneous plane wave algo-rithm combined with a tabulation and int
【机 构】
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School of Electronic Engineering
论文部分内容阅读
Electromagnetic scattering from targets situated in half space is solved by applying fast inhomogeneous plane wave algo-rithm combined with a tabulation and interpolation method. The integral equation is set up based on derivation of dyadic Green's functions in this environment. The coupling is divided into nearby region and well-separated region by grouping. The Green's func-tion can be divided into two parts: primary term and reflected term. In the well-separated region, the two terms are both expressed as Sommerfeld integral, which can be accelerated by deforming in-tegral path and taking interpolation and extrapolation. For the nearby region, the direct Sommerfeld integral makes the filling of impedance matrix time-expensive. A tabulation and interpolation method is applied to speed up this process. This infinite integral is pre-computed in sampling region, and a two-dimensional table is then set up. The impedance elements can then be obtained by interpolation. Numerical results demonstrate the accuracy and efficiency of this algorithm.
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