大功率高线性度的电流注入探头性能分析及研制

针对大电流注入探头应用于大电流注入等效强场电磁辐射试验时阻抗容易发生非线性变化的问题，通过分析大电流注入的方式，对现有的商品化电流探头进行了线性度测试。测试结果表明，注入功率增大，不同频点的线性误差也随之增大。提出了研制大功率高线性度电流探头的方案，进行研制并通过了测试。自行研制的电流注入探头最大耐受功率可达500 W，插入损耗随注入功率变化具备良好的线性度0.3 dB @ 1?500 W，可以满足开展大电流注入等效强场电磁辐射效应试验的技术需求。

Performance analysis and development of high-power and high-linearity current injection probes

Aiming at the problem that the impedance of the probe is prone to non-linear changes when applied to the bulk current injection test replacing high field intensity radiation, the linearity test of the existing commercial current probe is carried out by analyzing the method of large current injection. The test results show that as the injected power increases, the linearity error at different frequencies also increases. A plan for the development of a high-power and high-linearity current probe was proposed, and the probe was developed and passed the test. The self-developed current injection probe has a maximum withstand power of 500 W. The insertion loss varies with the injected power and has good linearity (0.3 dB @ 1?500 W). The probe can meet the technical requirements of carrying out bulk current injection (equivalent high field electromagnetic radiation effect) test.