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为解决目前可模拟的辐射场强和空间有限的问题,提高电流注入法的应用频带范围,提出了注入替代宽频电磁辐照方法。设计了基于定向耦合器原理的宽频带电流注入耦合装置,并以天线和射频前端为受试对象验证了方法的有效性。仿真研究了对称定向耦合器耦合端和直通端的相位差对监测波形的影响,分析了注入装置监测端波形与等效源波形的关系。结果说明:在互联系统的辅助设备为线性的条件下,即使受试设备是非线性的,辐照场强与注入电压的关系同样是线性的,该注入方法的应用频带范围可达数个GHz水平;对称定向耦合器耦合端和直通端的相位差会导致监测波形畸变;在系统端口匹配的情况下,注入装置监测电压与等效源电压为线性关系;若仅关心设备端口响应,通过注入等效替代天线和线缆为主要耦合通道的辐照实验是可行的。
In order to solve the problem of limited field strength and space that can be simulated at present, and to improve the application frequency range of current injection method, an injection method of replacing the wide-band electromagnetic irradiation is proposed. A wideband current injection coupling device based on directional coupler was designed. The effectiveness of the proposed method was verified by the antenna and RF front end. The influence of the phase difference between the coupled end and the through end of the symmetric directional coupler on the monitoring waveform was simulated and the relationship between the monitoring waveform at the monitoring device and the equivalent source waveform was analyzed. The results show that under the linear condition of the auxiliary equipment of the interconnected system, the irradiation field strength is also linear with the injection voltage even though the tested equipment is non-linear. The injection method can be applied in the frequency range of several GHz ; The phase difference between the coupling end and the through end of the symmetric directional coupler can lead to the monitoring waveform distortion; in the case of system port matching, the monitoring voltage of the injection device has a linear relationship with the equivalent source voltage; if only the device port response is concerned, Irradiation experiments using alternative antennas and cables as the main coupling channel are feasible.