从PCB、接地、屏蔽、滤波等几方面介绍了电子设备抑制电场辐射发射的设计措施, 就可能导致电场辐射发射试验超标的情况进行了说明。结合工程案例, 对试验过程中的辐射超标问题进行理论分析, 详述了改进设计中使用的铁氧体磁环的滤波原理, 提出了如何根据试验数据选择合适铁氧体的设计方法, 并结合试验证明所进行的理论分析合理, 所采取的设计措施有效。

From several aspects such as printed circuit board (PCB), grounding, shielding and filtering, the design measures to suppress the electric field radiation from electric equipments are introduced. With engineering examples, the issues radiation standard exceeding limit in tests are analyzed. The filtering principle of ferrite bead in the improved design is introduced in detail. The design method to choose appropriate ferrite bead based on tests data is proposed. The tests results show that the academic analysis is reasonable and the design measures are effective.