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This paper discusses the research status of Passive Intermodulation (PIM) on helicopter platforms, and mainly analyzes the reasons for the formation of PIM interference on it. RF devices that may generate PIM interference are analyzed at the same time. Taking the PIM interference of L-band antenna as an example, the existence of PIM problem on the helicopter platform was verified by means of electromagnetic simulation. The PIM Product (PIMP) of the RF device commonly used on the helicopter was tested to further prove that the PIM problem on it should be taken seriously.

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