针对波束波导系统结构和馈电特性,应用体面积分方程建立了任意结构波束波导中电磁波的激励、传输和辐射问题所对应的物理模型.在激励端,采用模式展开方法描述输入口面场分布,并利用模式匹配方法精确模拟波束波导馈电端的匹配状况.通过对波束波导内部的实际结构的精确拟合,基于积分方程建立了激励-传输-辐射的电磁模型,并以高效数值解法给出了波束波导内部任意场点的电场强度分布和波束波导的辐射场解.数值实例证明,积分方程方法可对电大尺寸任意结构波束波导的激励-传输-辐射问题给出稳定的、高精度的数值解.%According to the structural and feeding characteristics of beam waveguide system, the physical model for the excitation, transmission and radiation problems in beam waveguide with arbitrary shape is set up by using the volume-surface integral equation. The matching state at the feeding area is described accurately by the mode matching method. The solutions of electric field distribution and the aperture radiation field of beam waveguide are given by using the multilevel fast multipole algorithm (MLFMA) , which is a numerical algorithm with high efficiency. The example demonstrates that the method proposed can provide steady and accurate numerical solutions for the excitation-transmission-radiation problems in beam waveguide with arbitrary shape and electrically large size.
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