行波管中二次谐波注入对三阶互调的抑制
Second harmonic injection for restraining third-orderintermodulation in traveling wave tube
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摘要: 利用Christine 1维多信号非线性互作用物理模型，对螺旋线行波管中注入二次谐波后三阶互调的输出进行了模拟。模拟结果表明：在螺旋线大功率行波管中，通过二次谐波注入能有效地抑制三阶互调输出，从而降低了行波管的非线性输出，并存在最佳的注入功率和相位条件，使三阶互调可被抑制到最低。介绍了二次谐波注入抑制三阶互调的实验研究，并与模拟结果进行了比较，两者基本一致。Abstract: Harmonic injection is an effective solution for suppressing the harmonic and cross-modulation signals inspired by nonlinear distoration of traveling wave tube(TWT). In this paper, Christine 1D nonlinear beam-wave interaction model is used to simulate the 2nd harmonic injection. The results show that harmonic injection can suppress the 3IM signals inspired by nonlinear distoration effictively and reduce the output power of 3IM of TWT. The experimentation of harmonic injection is introduced whose results agree well with those of simulation agree well.
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Key words:
- traveling wave tube /
- harmonic injection /
- second harmonic /
- third-order intermodulation /
- nonlinearity
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