窄带光束在开口圆柱面上散射和衍射的物理光学有效性
On the Validity of Physical Optics for Narrow-band Beam Scattering and Diffraction from the Open Cylindrical Surface
摘要：
由于任意窄带光束在开口圆柱表面上的感应表面电流（在散射现象中）和等效表面电流（在衍射现象中）的精确公式已经在圆柱谐波的上下文中以其封闭形式的表达式示出，这给出了关于物理光学（PO）近似的有效性的信息。电场积分方程（EFIE）和磁场积分方程（MFIE）都被用来在圆柱谐波的上下文中找到感生（等效）表面电电流。给出了厄米高斯光束在开口柱面上散射和衍射的数值例子。这一结果对于评价PO近似在类圆柱面上的有效性是有用的。
英文摘要：
The exact formulas for the induced electric surface current (in the scattering phenomenon) and the equivalent electric surface current (in the diffraction phenomenon) on the open cylindrical surface due to an arbitrary narrow-band beam have been shown in their closed-form expressions within the context of the cylindrical harmonics, which gives information about the validity of the Physical Optics (PO) approximation. Both the Electric Field Integral Equation (EFIE) and the Magnetic Field Integral Equation (MFIE) are used to find the induced (equivalent) electric surface currents in the context of the cylindrical harmonics. The numerical example of the scattering and diffraction of the Hermite Gaussian beam from the open cylindrical surface is shown. The result is useful for the evaluation of the validity of the PO approximation in the cylinder-like surface.
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