This work demonstrated the directional passive intermodulation (PIM) product distribution effect in a microwave two‐port network using a distributed nonlinear model. The analysis is demonstrated through the comparison of PIM products at the double ends of a general two‐port network by a microstrip line. The reverse and forward PIM products are compared with the nonlinear source distribution and carrier frequency, the model and experiment demonstrates that the directional PIM effect (the difference by reverse and forward PIM) is caused by the PIM accumulation effect from multiple nonlinear sources, what is more, the frequency dependent phase relation can be one reason for the frequency dependent PIM product on wideband transmission line.

中文翻译：

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两端口网络中分布非线性的定向无源互调效应

这项工作证明了使用分布式非线性模型在微波双端口网络中的定向无源互调（PIM）产物分布效应。通过使用微带线比较普通两端口网络的两端的PIM产品，可以证明这一分析。将反向和正向PIM乘积与非线性源分布和载波频率进行比较，模型和实验表明，定向PIM效应（反向和正向PIM的差异）是由多个非线性源的PIM累积效应引起的。此外，频率相关的相位关系可能是宽带传输线上频率相关的PIM乘积的原因之一。