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通信系统对无源器件的大量使用,使无源互调级联问题越来越普遍。针对此问题,建立了简单的无源器件两级级联模型。在TE10模式下,用泰勒级数表征波导结处的金属-绝缘层-金属结构的非线性,考虑了传输线长度对输入载波信号相位的影响,分析了无源互调功率随传输线长度和输入载波相位差Δθ的变化情况。结果表明,波导结两级级联时,无源互调功率随输入载波信号相位的不同,存在0~3dB大小不同的累加值,由相位差Δθ可以得到取得最大和最小累加值时的传输线相位长度;且由于无源互调频率成分的相互作用,波导中互调产物种类也急剧增加。
The heavy use of passive components in communication systems has made the problem of passive intermodulation cascaded more and more common. Aiming at this problem, a simple two-stage cascade model of passive components is established. In the TE10 mode, the Taylor series is used to characterize the metal-insulator-metal structure nonlinearity at the waveguide junction. The influence of the transmission line length on the phase of the input carrier signal is considered. The relationship between the passive intermodulation power and the length of the input carrier Phase difference Δθ changes. The results show that there are 0 ~ 3dB accumulative values of the passive intermodulation power with the phase of the input carrier signal when the waveguide junction is cascaded. The phase of the transmission line can be obtained when the maximum and minimum cumulative values are obtained by the phase difference Δθ Length; and due to the interaction of passive intermodulation frequency components, the type of intermodulation products in the waveguide also increases sharply.