Research on the test method of substituting bulk current injection for electromagnetic radiation in the coupling channel of parallel double lines

Radiation effect test cannot be performed in large-scale space simulations of a strong field electromagnetic environment, and existing BCI (bulk current injection) technology employed for nonlinear system tests is subjected to its limitation. Given this, the present study analyzes the equivalent radiation test method of BCI in the parallel double-line coupling channel. To be specific, the response analysis models of the EUT (equipment under test) under the radiation condition and the injection condition are developed with the nonlinear response system as the EUT. In addition, the corresponding equivalent relationship is derived between the voltage of the injection excitation source and the radiation field intensity. Subsequently, the condition and the test method to substitute BCI for radiation are proposed and experimentally verified. As revealed from the research results, specific to nonlinear response systems, the BCI method proposed here can be accurately equated with the radiation effect test of the EUT. It is noteworthy that the maximum test error only reaches 3.62 dB, capable of satisfying the actual requirements of the project.