Passive Intermodulation (PIM) Measurement. Passive intermodulation (PIM) is a form of intermodulation distortion that occurs in passive components such as antennas, cables, connectors, or duplexers with two or more high-power input signals.PIM in the transmission path degrades quality of the wireless communication system.nnovative Passive Intermodulation (PIM) and S-parameter Measurement Solution with the ENA. This application note introduces the solution that combines PIM and S-parameter measurements by using the vector network analyzer.