主要关注空心导体圆柱的等效替代品-圆柱线栅笼的电磁特性，分别基于保角变换和等效电磁场理论进行了等效半径的推导，在此基础上运用电磁仿真软件CST 仿真分析了金属线栅的疏密和粗细程度对测试区电场波形的上升沿、脉宽和峰值的影响，并且对比了圆柱线栅笼和空心导体圆柱两种结构的电场分布。分析结果显示，双锥笼型结构完全能够等效代替空心导体圆柱，且进一步验证了等效半径理论的正确性。

The focus of this paper is the electromagnetic characteristics of cylindrical wire grid cage, an equivalent substitute for a hollow conductor cylinder. First of all, the equivalent radius is derived based on the conformal transformation and the equivalent electromagnetic field theory, respectively. Then, the electromagnetic simulation software CST is used to simulate the influence of the density and thickness of the metal wire grid on the risetime, pulse width and peak value of the electric field in the test area. Further, the electric field distributions of the cylindrical wire cage and the hollow conductor cylinder are compared. The results show that the cage structure can completely replace the hollow conductor cylinder and verify the rationality of the equivalent radius theory.