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理论分析了定向耦合器监测端脉冲信号波形与辐照等效源波形的关系,实验研究了在定向耦合器输入功率不变的前提下,直通端阻抗的变化对耦合端监测功率的影响,证明了理论分析的正确性,仿真分析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。结果表明:对于非线性互联系统,在保证系统响应相同的条件下,注入电压与辐照场强的关系是线性的;在系统端口匹配的情况下,监测电压与辐照等效源电压为线性关系;耦合端和直通端的相位差会导致监测波形畸变,应选用反对称或非对称定向耦合器作为监测设备。
The relationship between the pulse waveform of the directional coupler and the waveform of the equivalent radiation source is analyzed theoretically. The influence of the variation of the impedance of the direct-fed terminal on the power of the coupled terminal under the premise of constant input power of the directional coupler is proved. The correctness of the theoretical analysis is analyzed, and the influence of the phase difference between the coupled end and the through end of the symmetric directional coupler on the monitoring waveform is analyzed. The results show that for the nonlinear interconnected system, the relationship between the injected voltage and the radiation field is linear under the condition of the same system response. In the case of system port matching, the voltage of the monitor voltage and the equivalent source voltage of the irradiation are linear Relationship; the coupling end and the straight end of the phase difference will lead to monitoring waveform distortion, should be used anti-symmetric or asymmetric directional coupler as a monitoring device.