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以两层平面分层媒质为例,讨论了不同情况下空域格林函数的计算方法,指出了有耗平面分层媒质情况下传统方法的缺点,提出采用二维离散复像法(2D-DCIM)处理有耗平面分层媒质中的格林函数,并对积分路径做了相关要求,得到了同时包含场点纵坐标z和源点纵坐标z′及场源点横向距离ρ的格林函数的空域闭式表达式。所得结果与数值积分法的结果吻合良好,证实了该文方法的正确性。
Taking a two-layer planar stratified medium as an example, this paper discusses the calculation methods of the Green’s function of airspace in different situations, points out the shortcomings of the traditional method when the stratified medium is depleted, and proposes a two-dimensional discrete multi-image method (2D-DCIM) The green function in the stratified medium with dissipative planar surface is processed and the related requirements of the integral path are obtained. The airspace closed with Green’s function which contains both the vertical coordinate z of the field point and the vertical coordinate z ’of the source point and the horizontal distance ρ of the field source point Expression. The result is in good agreement with the numerical integration method, which proves the correctness of the method.