采用有限元法与矩量法相结合分析有限导体面上背腔天线的辐射特性。计算中采用一种有效的积分方程及矢量权函数的形式来保证计算精度。在前处理中采用 Auto CAD中的实体造型技术 ,对目标可方便地进行离散和局部加密 ,计算机存储空间及计算量明显下降 ,使本文方法成为对背腔天线辐射问题计算的一种有效方法。文中计算了有限导体面上同轴腔及同轴馈电圆形腔的辐射特性 ,并与已发表的结果进行比较 ,验证了本文算法的有效性。 The radiation characteristics of the back cavity antenna on a finite conductor surface are analyzed by the combination of the finite element method and the moment method. In the calculation, an effective integral equation and vector weight function are used to ensure the calculation accuracy. In the preprocessing, the entity modeling technique in Auto CAD is used to discretely and locally encrypt the target easily. The storage space and computational cost of the computer are obviously decreased, which makes the method of this article an effective method to calculate the radiation problem of the back cavity antenna. In this paper, the radiation characteristics of the coaxial cavity on the finite conductor surface and the circular cavity of the coaxial feed are calculated and compared with the published results to verify the effectiveness of the proposed algorithm.