直接电流注入在电磁兼容中的频率应用范围

Cutoff frequencies of direct current injection in EMC test

利用点匹配法计算了直接电流注入模拟装置中高阶模的频率,给出了不同截面尺寸的模拟装置与其有效使用频率范围的关系,装置的特性阻抗与其最高使用频率范围呈反比的关系。根据理论计算和对作者研制的模拟装置内场强与频率关系的测量,对直接电流注入技术在电磁兼容测试中的频率应用范围进行了评估,其有效使用频率范围在400MHz以下。

The cutoff frequencies of direct current injection in a TEM cell is calculated by employing the point-matching method, the relation between dimensions of direct current injection device and cutoff frequencies, and the inverse ratio between the cutoff frequencies and the characteristic impedance, are presented in this paper. By experimential test and computer simulation, the application scope of direct current injection technique into electromagnetic compatibility test is evaluated. The results show that the direct current injection technique may be used under 400MHz.